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Tool Talk Discussion Forum

100 amp sub panel

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Farmboy

01-30-2004 16:57:13

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Fixing to install a 100a sub panel an was wondering what size wire to use.I've been told number 2 aluminium ser cable. It's going to be run about 50 feet. Thanks

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thurlow

01-31-2004 18:04:28

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

There are some great sites dealing with electrical questions..... one is.....

Link

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Steve Crum

01-31-2004 18:04:25

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

I use a 100 amp sub in my shop. I used #2, 4 conductor aluminum run under the shop floor in sch 40 4" PVC conduit. For the sub I used a 12 spot main lug panel as I breakered this panel in the main 200 amp panel. In retrospect I wish I had put in a 36 spot panel. The heaviest load on this panel is a 7.5 hp compressor. The 50+ amp loads are all drawn from the main panel. Every 6 months I shutdown the power and check all connections for tight, Haven't found a loose one yet. Be sure to use nolox or other anti-corrosive grease for electical connections in all the connections especially with aluminum cable. (this stuff also works great on battery terminals)

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Richard Fazio

01-31-2004 17:56:11

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

Stay away from the aluminum unless you have a very long run. For 50 ft use copper and save yourself the problems of aluminum. Aluminum is dangerus unless installed correctly with proper procedures. A lot of homes have burnt down because of aluminum.

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Chuck MI

01-31-2004 17:37:41

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

There's an old saying about opinions that would be appropriate here...

Any way, I have the luxury of knowing some licensed electricians through work whom I usually get sound advice through. However before this, I bought a paperback electrical book at Farm and Fleet that was basically an abridged version of the national electrical code. If you are going to do your own wiring, a small manual would be a good investment. Another good source would be your local electrical inspector. In my experience, they would rather you asked questions beforehand, rather than having to come back and reinspect afterwords.

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Lamchops

01-31-2004 14:26:17

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

Here's the deal. For a 100 amp sub panel you would use #3 THWN copper wire which is rated for 100 amps. I would not recommend using aluminum wire, it must be installed correctly or it will fail in time. If it's in the same building that the service (main panel) is you also will need to ground the panel by either using metal conduit or using a #8 THWN copper ground wire. You would not use the "Bonding screw" in the sub panel (the screw that connects the neutral bar to the metal panel). If you use the concentric knock outs in either panel and using metal conduit you would also use bonding bushings with a #8 THWN copper wire jumper to the ground bar or directly to the metal panel, not the neutral bar. You would never connect ground wires to a neutral bar of a sub panel. Where I live, you would not be allowed to use service entrance cable for a sub panel.

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Short Round

01-31-2004 13:00:53

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

Farmboy, if you want to take all the guesswork out of your question look it up in the Nationl Electrical Code book 2002 version. Look at article 310.16(conductor ampacity) Them go to article 250.32(two or more buildings or structures supplied from a common service) THEN.... if you really understand these sections go ahead and wire it. If not hire a qualified electrcian to do the job. You dont say if it is going to be underground, overhead, or in conduit so you still need a lot of information before you start. Do it once, do it right, and be done with it.

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RZ(Wa)

01-31-2004 09:35:55

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

If you install Aluminum, you be sure to use the Anti-Oxidizer paste at all of the connections. In some locales, this is a requirement. As I understand it, the aluminum will oxidize sooner and to a greater extent than copper and that this is what NEMA found to cause many of the house fires back in the 60's and 70's and is why it is recommended to go at least 2 sizes larger than copper for the same installation.

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Bus Driver

01-31-2004 05:54:46

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

One of the big problems with this project will be deciding which information is correct and which is baloney. More information might change the wire sizes I am posting, but #2 copper or 1/0 aluminum are the proper sizes for 100 amperes. I suspect that with your experience level, the copper is the better choice. Installation techniques for aluminum require some extra precautions.

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MarkB

01-31-2004 05:05:00

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

#2 Al is appropriate, or #4 Cu.

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Alvin n Ms.

01-30-2004 19:48:51

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Re: 100 amp sub panel in reply to Farmboy, 01-30-2004 16:57:13

Farmboy, #2 aluminun would be large enough for 200 amps. Do yourself a favor and use copper. It is a lot easier to work with, and I think #6 will be plenty large enough. They will tell you for sure at any electrical supply store. alvinnms

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MT Pockets

01-30-2004 21:47:08

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Re: Re: 100 amp sub panel in reply to Alvin n Ms., 01-30-2004 19:48:51

Alvin, I think you are mistaken.I believe 100amp requires #2 copper and 200amp requires 2/0 copper for service entrance.I believe the neutral may be dropped 2 wire sizes. Somebody correct me if I'm wrong. Thanks. Steve in Texarkana.

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Alvin n Ms.

01-31-2004 06:49:40

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Re: Re: Re: 100 amp sub panel in reply to MT Pockets, 01-30-2004 21:47:08

Opps I'am sorry. The first time, I've ever been wrong in my life. alvinnms

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