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off topic question repowering

 

Hello all. Back again with another simple question. What american wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?

Thank in advance,

Bill in NC, formerly from RI
 

If you buy an extension cord from Dollar Tree, cut off the plug and socket, you'll have 6 feet of good wire for $1.25 with plenty of amps rating.

Neil.

On Tue., Jul. 26, 2022, 09:05 William Macy via , <wkmacy=[email protected]> wrote:
Hello all. Back again with another simple question. What american wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?

Thank in advance,

Bill in NC, formerly from RI

 

If you're going to be using it only for short run times, it should be fine. If you plan on doing more turning, and running it longer (which the new DC motor should support just fine) I'd go one step up in size, or down in gauge #, i.e. AWG 14, if you're right about the motor wires being 16 ga. Lower ampacity wiring is more likely to burn up on a longer run of wire, and for longer run times. For a safety factor, you want about twice the ampacity you expect to need. If you're running the wire for only a couple of feet, There is less voltage drop, so less concern, but wire is relatively cheap compared to replacing the motor or power supply, so heavier wire is better...



Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better



On Tuesday, July 26, 2022 at 11:05:51 AM CDT, William Macy via groups.io <wkmacy@...> wrote:


Hello all. Back again with another simple question. What american wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?

Thank in advance,

Bill in NC, formerly from RI

 

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If 18 gauge is adequate, use 16 gauge.? That is, unless you have an unusually long run of cable, in which instance you will need to compute the voltage drop in that length of cable and adjust the wire size accordingly.? ?

?

Jerry F.

?

From: [email protected] [mailto:[email protected]] On Behalf Of William Macy via groups.io
Sent: Tuesday, July 26, 2022 9:06 AM
To: [email protected]
Subject: [Unimat] off topic question repowering

?

Hello all. Back again with another simple question. What american wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?

Thank in advance,

Bill in NC, formerly from RI

 

According to the NEC information that I found, 18AWG fixture wire has an allowable ampacity of 10 amps, and the allowable ampacity of 16AWG fixture wire is 13 amps.

Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.? With 16AWG and the same conditions, the maximum length is 55'.

Don?
 

On Wed, Jul 27, 2022 at 04:07 PM, <ddmckee54@...> wrote:
Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.
Since the motor is 150 W the current for the 110 V supply is only 1.36 A, call it 1? A, so quite light wire will do. I would use whatever is easy to use - sometimes a wire can be too thin to be practical. On the 24 V side the current will be 6.25 A maximum, so 10 amp wire will be fine. The motor will rarely, if ever, work at maximum power, and the cable run will be short, so it would probably be OK to use 6 A rated cable, and voltage drop will not be significant.
 

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Good Evening Don,

?

The original question dealt with voltage drop on a 24 volt line. (See original question below.)

?

The voltage drop for a length of wire is dependent on its length, the current through it, the size of the wire, and the wire’s material.? All other things being equal, the length of wire that will give you a 3% voltage drop for a given current through it will be about 22% for a supply voltage of 24 volts instead of 110 volts? ((24 / 110) x 100).? Therefore, using the numbers you supplied (and assuming they were for the supply plus the return lengths of wire), one would be limited to 7.5 feet of 18 gauge wire or 12.1 feet of 16 gauge wire. ?

?

I don’t know what on-line table or calculator you used, but one also needs to be careful when doing these types of calculations to recognize if the cable is in free air or in a conduit.? Wires in a conduit will have a more restrictive rating than those in free air because any heat generated in the wire will be trapped with the conduit.? ??

?

Jerry F.

?

ORIGINAL QUESTION: “Hello all. Back again with another simple question. What american (sic) wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?”

?

From: [email protected] [mailto:[email protected]] On Behalf Of ddmckee54@...
Sent: Wednesday, July 27, 2022 8:08 AM
To: Gerald Feldman; [email protected]
Subject: Re: [Unimat] off topic question repowering

?

According to the NEC information that I found, 18AWG fixture wire has an allowable ampacity of 10 amps, and the allowable ampacity of 16AWG fixture wire is 13 amps.

Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.? With 16AWG and the same conditions, the maximum length is 55'.

Don?

 

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Hi Gang:

The other important fact is the voltage drop for a given amperage is the same no matter what voltage you start at. So a 3 volt drop at 12 volt is a bigger problem than at 120 volts.

So 18AWG wire can pass 1100 watts at 110 volts, but 2200 watts at 220 volts.

Also remember we are talking about a motor for Unimat lathe, that has the rigidity to take maybe a 200 watt cut.

Carl.

According to the NEC information that I found, 18AWG fixture wire has an allowable ampacity of 10 amps, and the allowable ampacity of 16AWG fixture wire is 13 amps.

Doing the voltage drop calculations, using the maximum allowable voltage drop of 3%, 110 volts supply voltage, and your load of 6 amps - the maximum length of the 18AWG fixture wire is 34'.? Any longer and you exceed the 3% allowable drop.? With 16AWG and the same conditions, the maximum length is 55'.

Don?

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