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Dr. David Kirkby from Kirkby Microwave Ltd
Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
-- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
|
That is a 240 volt 15 amp grounding plug.?
The mains voltage has been increasing, it was 110-115 for a while (220-230) but now is nominal 120 (240). I don’t know what that supply can handle but those specs have been very loosely-goosey from manufacturers for a long time.?
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On Nov 2, 2018, at 7:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> wrote: Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
-- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
<Whats-this-mains-plug.jpg>
|
Oh, and it’s wired as 240 center tapped, so the hot leads are interchangeable and there should be a green earth lead. No neutral in this case, with this 6-15 plug, here in the US power system.?
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On Nov 2, 2018, at 7:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> wrote: Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
-- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
<Whats-this-mains-plug.jpg>
|
You may, however, find in the cord either a white wire, black wire, and a green wire; or a blue wire a brown wire and a green wire.
If the former, white is neutral, black is live, and green is ground. If the latter, blue is live, brown is neutral, and green is ground.
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On Nov 2, 2018, at 19:35, Peter Gottlieb < hpnpilot@...> wrote: Oh, and it’s wired as 240 center tapped, so the hot leads are interchangeable and there should be a green earth lead. No neutral in this case, with this 6-15 plug, here in the US power system.? On Nov 2, 2018, at 7:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...> wrote: Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
-- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
<Whats-this-mains-plug.jpg>
|
That is a “200V” plug, with two phases (lives, hots) on the flat blades, and earth on the pin. In the US, the green conductor color is protective earth, white is neutral, and then black, red, blue are lives/hots/phases.
3-phase devices expect 120 degrees between phases, 2-phase devices must accept either 120 or 180 degrees.
So the cable should not have a white conductor. It will most likely have Black, Red, Green for two phases and protective earth. It should be fine to connect it to L, N, and PE respectively - with a caveat as follows: In the US, the phase-neutral voltage is 120V for such 200V power sources. If there would be some varistors or other overvoltage protection devices between each phase and earth, they might trigger when presented with double than expected voltage.?
So if you plug it in and it blows the fuses, you will want to locate and temporarily remove the input overvoltage protection devices and retry. Or power it up first with an isolation transformer, with the center tap of the secondary connected to earth, and if it works thus but not when plugged directly into the mains, then you’ll know why. It’s not highly likely that such overvoltage protectors would be present but you never know. Murphy’s law tells me that if I mention them, they’ll be absent, but if I gloss over them, you’ll find them there all right :)
I wrote “200V” because in the US this may be either 208V or 240V, and all reasonable devices with such a plug should tolerate either voltage, and most certainly will not be designed to accept only 208V but not 240V.?
In 3-phase supplies, with (R,S,T)-N at 120V and 120 degrees apart, i.e. many commercial locations, the receptacles for those plugs are simply wired between any two phases, so there’s two hots/lives and earth presented to the plug. That’s 208V nominal between phases.
In typical “domestic-style” (plenty commercial locations are that way as well, though) split-phase supplies, the two phases are 180 degrees apart, and there’s 240V between them, and 120V between each and earth.?
I hope that gives you enough information to safely use your supply.
Cheers, Kuba 2 nov. 2018 kl. 19:23 skrev Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...>:
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Show quoted text
Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
-- Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
<Whats-this-mains-plug.jpg>
|
Do note, though, that I’ve seen designs that have an input transformer with a 208V tap, and can be wire-strapped for either 208V or 240V operation.
Now that I’ve mentioned it, yours won’t have such a tap, or will be already strapped to 240V. Otherwise, of course, you’d have the oddball device with such a tapped input transformer and it’d be set for 208V, requiring restrapping for 240V –
but such things never happen when you are prepared for them.
Cheers, Kuba
2 nov. 2018 kl. 20:25 skrev Kuba Ober < kuba@...>:
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Show quoted text
That is a “200V” plug, with two phases (lives, hots) on the flat blades, and earth on the pin. In the US, the green conductor color is protective earth, white is neutral, and then black, red, blue are lives/hots/phases.
3-phase devices expect 120 degrees between phases, 2-phase devices must accept either 120 or 180 degrees.
So the cable should not have a white conductor. It will most likely have Black, Red, Green for two phases and protective earth. It should be fine to connect it to L, N, and PE respectively - with a caveat as follows: In the US, the phase-neutral
voltage is 120V for such 200V power sources. If there would be some varistors or other overvoltage protection devices between each phase and earth, they might trigger when presented with double than expected voltage.?
So if you plug it in and it blows the fuses, you will want to locate and temporarily remove the input overvoltage protection devices and retry. Or power it up first with an isolation transformer, with the center tap of the secondary connected
to earth, and if it works thus but not when plugged directly into the mains, then you’ll know why. It’s not highly likely that such overvoltage protectors would be present but you never know. Murphy’s law tells me that if I mention them, they’ll be absent,
but if I gloss over them, you’ll find them there all right :)
I wrote “200V” because in the US this may be either 208V or 240V, and all reasonable devices with such a plug should tolerate either voltage, and most certainly will not be designed to accept only 208V but not 240V.?
In 3-phase supplies, with (R,S,T)-N at 120V and 120 degrees apart, i.e. many commercial locations, the receptacles for those plugs are simply wired between any two phases, so there’s two hots/lives and earth presented to the plug. That’s 208V
nominal between phases.
In typical “domestic-style” (plenty commercial locations are that way as well, though) split-phase supplies, the two phases are 180 degrees apart, and there’s 240V between them, and 120V between each and earth.?
I hope that gives you enough information to safely use your supply.
Cheers, Kuba
2 nov. 2018 kl. 19:23 skrev Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...>:
Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which
says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2"
between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.?
Dave
--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
<Whats-this-mains-plug.jpg>
|
There are also Boost/Buck 208/240 transformers for industrial use. I had to install one on a pipe bender for a local company. The machine had always been wimpy, running off 208, but it worked properly at 240V. The 'industrial' electrician that wired it when they move had wired it to a 120V circuit, even though he used the proper outlet. A new breaker, and a boost transformer restored operation, and doubled the production rate. Keep in mind that the difference is over 13% and it can cause problem on some equipment.
Michael A. Terrell
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-----Original Message----- From: Kuba Ober Sent: Nov 2, 2018 8:33 PM To: " [email protected]" Subject: Re: [HP-Agilent-Keysight-equipment] What's this mains plug with live/neutral horizontal when earth is at the top? Do note, though, that I’ve seen designs that have an input transformer with a 208V tap, and can be wire-strapped for either 208V or 240V operation. Now that I’ve mentioned it, yours won’t have such a tap, or will be already strapped to 240V. Otherwise, of course, you’d have the oddball device with such a tapped input transformer and it’d be set for 208V, requiring restrapping for 240V but such things never happen when you are prepared for them. Cheers, Kuba
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The official name for your plug is "NEMA 6-15". ?I once had a 240V through-the-wall air conditioner with that connector. ?As Kuba said, 240V power in the US is usually center-tapped, so both blades are expected to be?hot, whatever color they are.
Dave Wise?
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From: [email protected] <[email protected]> on behalf of Kuba Ober <ober.14@...>
Sent: Friday, November 02, 2018 5:33 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] What's this mains plug with live/neutral horizontal when earth is at the top?
?
Do note, though, that I’ve seen designs that have an input transformer with a 208V tap, and can be wire-strapped for either 208V or 240V operation.
Now that I’ve mentioned it, yours won’t have such a tap, or will be already strapped to 240V. Otherwise, of course, you’d have the oddball device with such a tapped input transformer and it’d be set for 208V, requiring restrapping for 240V –
but such things never happen when you are prepared for them.
Cheers, Kuba
2 nov. 2018 kl. 20:25 skrev Kuba Ober < kuba@...>:
That is a “200V” plug, with two phases (lives, hots) on the flat blades, and earth on the pin. In the US, the green conductor color is protective earth, white is neutral, and then black, red, blue are lives/hots/phases.
3-phase devices expect 120 degrees between phases, 2-phase devices must accept either 120 or 180 degrees.
So the cable should not have a white conductor. It will most likely have Black, Red, Green for two phases and protective earth. It should be fine to connect it to L, N, and PE respectively - with a caveat as follows: In the US, the phase-neutral
voltage is 120V for such 200V power sources. If there would be some varistors or other overvoltage protection devices between each phase and earth, they might trigger when presented with double than expected voltage.?
So if you plug it in and it blows the fuses, you will want to locate and temporarily remove the input overvoltage protection devices and retry. Or power it up first with an isolation transformer, with the center tap of the secondary connected
to earth, and if it works thus but not when plugged directly into the mains, then you’ll know why. It’s not highly likely that such overvoltage protectors would be present but you never know. Murphy’s law tells me that if I mention them, they’ll be absent,
but if I gloss over them, you’ll find them there all right :)
I wrote “200V” because in the US this may be either 208V or 240V, and all reasonable devices with such a plug should tolerate either voltage, and most certainly will not be designed to accept only 208V but not 240V.?
In 3-phase supplies, with (R,S,T)-N at 120V and 120 degrees apart, i.e. many commercial locations, the receptacles for those plugs are simply wired between any two phases, so there’s two hots/lives and earth presented to the plug. That’s 208V
nominal between phases.
In typical “domestic-style” (plenty commercial locations are that way as well, though) split-phase supplies, the two phases are 180 degrees apart, and there’s 240V between them, and 120V between each and earth.?
I hope that gives you enough information to safely use your supply.
Cheers, Kuba
2 nov. 2018 kl. 19:23 skrev Dr. David Kirkby from Kirkby Microwave Ltd < drkirkby@...>:
Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which
says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2"
between them, so there is approximately 1" between the two furthest edges of the pins.
|
According to my reference, here in North America that's a
NEMA 6-30 plug, rated up to 250 V and 30 amps. The round pin is of course
earth ground. The arrangement I'd mostly likely expect would be to see
235 VAC across the two flat blades, with each one swinging ±117.5 V
relative to Neutral, in opposite phase (180? apart). Per the electrical
codes here, Neutral is supposed to be tied to Earth at the service
entrance to the building, and only there. But there are of course many
ways to get burned by making assumptions here, both figuratively and
literally. It's also possible to come up with 208 VAC by tapping two of
the three hot phase wires in a three-phase service.
Nominal in NA is 117 VAC between hot and neutral, and 235 VAC between the
two hot wires of standard residential service. Mine generally runs a bit
above that, despite being on a fairly long line from the source. I think
they set the taps up on the transformer to allow for that.
Steve Hendrix
At 2018-11-02 06:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd
wrote:
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The UK seller said it is 120 V,
so needs a transformer to run from the UK mains, The mains voltage here
is supposed to be 230 -6%/+10%. But I have my suspicions that the UK
seller may be wrong, as the US manufacturer sent me a manual on the power
supply, which says its 220 VAC. But they wrote it is a 20-year old custom
design. (It's entirely possible someone has changed
things.)
|
I think Dave is correct and I was mistaken above. Hard to
tell without a scale for size, but the proportions do look closer to the
15A version than the 30A version.
At 2018-11-02 07:59 PM, Dave Wise wrote:
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Show quoted text
The official name for your plug
is "NEMA 6-15".? I once had a 240V through-the-wall air
conditioner with that connector.? As Kuba said, 240V power in the US
is usually center-tapped, so both blades are expected to be hot, whatever
color they are.
|
I had no idea so many variations existed. Could you imagine the confusion aliens from space would have in plugging in a shaver or phazer or whatever?
Finding the conductors will be easy because whatever color earth is, will be easily verified with an ohmmeter.? Does the transformer primary have four or more leads? You may have options. You might try powering it with a current limited fraction of the voltage you intend to apply and from there you can estimate the turns ratio by measuring the secondary.
Check this WiKI it looks like Japanese airconditioner plug.
https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Japanese_air_conditioner_electrical_outlet_200v.jpg/255px-Japanese_air_conditioner_electrical_outlet_200v.jpg
https://en.wikipedia.org/wiki/AC_power_plugs_and_sockets
|
Hubbell is a good source of US standard industrial and residential electrical connectors:
<>
Michael A. Terrell
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-----Original Message----- From: RFI-EMI-GUY Sent: Nov 2, 2018 10:18 PM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] What's this mains plug with live/neutral horizontal when earth is at the top? I had no idea so many variations existed. Could you imagine the confusion aliens from space would have in plugging in a shaver or phazer or whatever? Finding the conductors will be easy because whatever color earth is, will be easily verified with an ohmmeter. Does the transformer primary have four or more leads? You may have options. You might try powering it with a current limited fraction of the voltage you intend to apply and from there you can estimate the turns ratio by measuring the secondary. Check this WiKI it looks like Japanese air conditioner plug.
|
All you need to do is poke around on or similar for plugs/outlets rated greater than say, 200V.
Here's a pretty much identical plug configuration:
And here's a matching socket (though it accepts both 15 and 20 amp plugs):
(There is one of those in our garage... for the little TIG welder that likes 220V.)
A 20A plug has both vertical and horizontal flat blades and the 20A socket will take either plug.
So the plug in question is for 220V (up to 250V), 15A.? As Peter Gottlieb points out, it's likely 240V here in the USA now.
|
A search for "AC PLUGS" brought up a pdf which indicates that it is probably a "NEMA 6-15P". A search of the internet for "NEMA 6-15P" produced this link . Hope this helps. On 2018-Nov-02 7:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote: Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.
Dave
--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
--- This email has been checked for viruses by AVG.
|
Here is a chat of plugs/sockets and the connection colour codes . On 2018-Nov-02 7:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote: Sorry, this is a bit off-topic for the HP/Agilent list, but I'm hoping someone, (probably from the USA), can help me.
I bought a Gamma high-voltage regulated power supply (0-15 kV, 0-12 mA).
from eBay.
The UK seller said it is 120 V, so needs a transformer to run from the UK mains, The mains voltage here is supposed to be 230 -6%/+10%. But I have my suspicions that the UK seller may be wrong, as the US manufacturer sent me a manual on the power supply, which says its 220 VAC. But they wrote it is a 20-year old custom design. (It's entirely possible someone has changed things.)
Am I right in thinking the plug attached to this is not designed for 120 V use, but instead for 240 V? When I look at it, with the earth pin at the top, the live/neutral are horizontal. The live/neutal pins are approximate 1/4" across, with approximately 1/2" between them, so there is approximately 1" between the two furthest edges of the pins.
I know one can always start at a low voltage, and I have a variac. But I'm also aware in some cases that using too low a voltage can damage equipment. So if this thing is supposed to take 220 V, I'd rather not start with 120 V.
The manual has no tolerance for the mains voltage - it just says 220 VAC. My own voltage is typically 235 V.
Some time ago the voltage was logged here for a period of 4 days and peaked at 255 VAC (RMS value), but the transformer taps have since been changed, and the voltage dropped 5%, so I think it might peak at 243 VAC RMS - and that would only be very occasionally.
One other thing. When I cut this mains plug off, what colour cables would I expect to see, and what would be live and neutral?
Here in the UK, neutral is very close in voltage to the earth wire - ideally, it is zero. Would there be an equivalent wire colour on this mains lead?
This thing can produce 15 kV at 12 mA, which I would guess would give someone a nasty burn at the very least, and could even be fatal. But my biggest concern at the minute is how to get power to this.
Dave
--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100
--- This email has been checked for viruses by AVG.
|
Dear Dave,
15kV at 15mA is likely to be lethal.
Take very great care with this device.
Regards,
Alwyn
_____________________________________________________
Alwyn Seeds, Director
114 Beaufort Street (Management) Company Ltd.,
114 Beaufort Street,
London,
SW3 6BU
+44 020 7376 4110
114 Beaufort Street (Management) Company Ltd., Registered in England and Wales: No. 02797775 Registered Office Address: 114 Beaufort Street, London, SW3 6BU ______________________________________________________
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Actually probably not.
You have to get the current into the wet stuff under the
skin. High voltages like that arc over the skin, char it,
and travel on the outside.
Companies that make capacitor chargers for lasers and the
like, keep the supplies capacitance to a minimum, so as to
stay well below he 10J fatal zone. That way the supply
won't kill....usually.
The real killer voltage is 240V AC. It contracts muscles
in your arms, so you cannot release your grip, and is the
perfect voltage to put milliamps of current through your
heart. There is a reason why the Europeans are so obsessive
with power line safety.
But take care anyway. Electric death is a fickle beast.
-Chuck Harris
alwyn.seeds1 wrote:
toggle quoted message
Show quoted text
Dear Dave,
15kV at 15mA is likely to be lethal.
Take very great care with this device.
Regards,
Alwyn
_____________________________________________________
Alwyn Seeds, Director
114 Beaufort Street (Management) Company Ltd.,
114 Beaufort Street,
London,
SW3 6BU
+44 020 7376 4110
114 Beaufort Street (Management) Company Ltd., Registered in England and Wales: No. 02797775 Registered Office Address: 114 Beaufort Street, London, SW3 6BU
______________________________________________________
|
Dr. David Kirkby from Kirkby Microwave Ltd
The real killer voltage is 240V AC.? It contracts muscles
in your arms, so you cannot release your grip, and is the
perfect voltage to put milliamps of current through your
heart.? There is a reason why the Europeans are so obsessive
with power line safety.
I have heard the opposite that DC is more dangerous than AC. But I am not keen to grab either.
Fortunately this power supply can work as constant current or constant voltage and will switch between the two as the load resistance changes.?
As much as I have every respect for high voltages, I will set the current limit as low as it will go.?
I will be charging some capacitors, but no larger than 200 pF.? That is the short term use anyway. Of course, having something like this, one might have other uses in the future.?
I have just bought a 30 kV 300 uA supply too. The latter is more useful to me. but I had bought the 15 kV 12 mA? before being offered the 30 kV 30 uA one.?
Someone I know who worked at various power stations said 415 V was the most dangerous as there was not as many safety precautions as with higher voltages.?
But take care anyway.? Electric death is a fickle beast.
-Chuck Harris
Yes, I will.??
Dave.?
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Dr. David Kirkby from Kirkby Microwave Ltd
On Sat, 3 Nov 2018, 13:33 Dr. David Kirkby < drkirkby@... wrote: I have just bought a 30 kV 300 uA supply too. The latter is more useful to me. but I had bought the 15 kV 12 mA? before being offered the 30 kV 30 uA one.?
This second power supply is 300 uA, not 30 uA. I believe 30 kV 300 uA will not be fatal, but I don't intend testing it.?
Dave.?
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On 11/2/2018 10:43 PM, Michael A. Terrell wrote: Hubbell is a good source of US standard industrial and residential electrical connectors:
<>
Hello-- Cartoonist B. Kliban pretty well summed up the power connector diversity issue here... ...Or when TinyURLed... 73-- Brad AA1IP
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bownes
Michael A. Terrell
RFI-EMI-GUY