Electrician help

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Old 12-29-16, 08:26 PM
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Electrician help

So I needed to wire a 240 v panel. I will be drawing a constant 25 amps. Is 10 gauge too small or is it fine? I used the 10-2 and a 30 amp breaker. I know it's "rated" for up to 30 on both but I feel like a constant 24 hours a day draw that I may have to go bigger on the wire and/or breaker. Just want to be sure. Thanks.
 
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Old 12-29-16, 08:31 PM
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Welcome to the forums.

25 amps constant draw technically exceeds the 80% rating of a 30 amp breaker.
 
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Old 12-29-16, 08:32 PM
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Welcome to the forums.

A continuous draw should be no more than 80% of the ampacity of the circuit.
In the case of a 30A circuit...... that would be 24A.

What is the load ? Inductive ? Resistive ?
 
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Old 12-29-16, 09:26 PM
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I believe it's inductive.
 
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Old 12-29-16, 09:31 PM
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It's 6000 watts , I do know that much.
 
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Old 12-29-16, 10:15 PM
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Inductive would be like ballast lighting or motor load.
Resistive is water heating, electric heat or incandescent.

It looks like to be code compliant you'll need to use #8 wiring. The breaker is ok.
 
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Old 12-29-16, 10:30 PM
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Then yes inductive. Is it not safe to run as is or is it just "code" that I should rewire with 8 gauge? Can I use 8-2 Romex since it's just two hots and a ground or should I us 8-3 and not use the neutral? Thanks I really appreciate it electric isn't my specialty.
 
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Old 12-30-16, 03:43 AM
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Since we don't really know what is at the other end of the cable we can't be sure if you need the other wire or not. How will it be connected? Plug? Hardwire? Can you tell us exactly what it is that you are connecting?
 
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Old 12-30-16, 05:10 AM
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Is it not safe to run as is or is it just "code" that I should rewire with 8 gauge?
It being not to code means that it is not safe. The code is designed to provide rules for safe installations.

You can use 8/2 NM-b cable (Romex) if the cable will be protected, and if your equipment only requires 240 volts. If it reads 120/240 on the nameplate then is will require a neutral.

You have been very vague on what you are installing. It would be helpful if we know what you are hooking up as there may be special NEC rules that apply.
 
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Old 12-30-16, 06:58 AM
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My apologies, it's lighting. It is strictly 240v no 120 at all. Also what do you mean if the cable is protected?
 
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Old 12-30-16, 07:54 AM
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Is this commercial? 240v would be unusual for residential.
 
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Old 12-30-16, 07:56 AM
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Yes and no. It's residential now but there used to be a tow yard behind my house.
 
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Old 12-30-16, 08:22 AM
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Also what do you mean if the cable is protected?
NM cable cannot just be run on the surface of the wall or left hanging, it needs to be protected by physical damage. Inside a wall/ceiling cavity is considered protected.

Is this all inside a building or will it be outside?
 
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Old 12-30-16, 08:34 AM
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It's all indoors was going to run it up the stone about a foot into rafters for about 20 feet then down the wall about 3 feet. kind of like a basement.
 
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Old 12-30-16, 04:17 PM
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That would not be considered protected, you would need to put it in raceway or something on the walls. Not enough info on the rafters but that may be ok.
 
 

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