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Old 03-18-2011, 09:56 AM   #1
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Stranded wire connections at subpanel.


I've just finished (hopefully) my first electrical project but had a quick question about the panel connections.

I ran 10/3 romex from the main panel in the house to a junction box (~25') on the inside of an exterior wall. I then ran 4-#10 stranded THWN inside conduit (~40') to my subpanel in the shed. I then connected the stranded THWN directly to the double breaker (backfed main), the ground bar and the neutral bar.

Is there any problem with running the stranded wire directly to the breakers/ground bar/neutral bar? The wire seemed to flatten/fan-out at the end as I tightened up the connections at the breaker and at the neutral bus bar. I just wanted to make sure this wasn't going to be a problem. Are there any tricks to make a better connection than this?

Thanks in advance,

Mike

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Old 03-18-2011, 11:01 AM   #2
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Stranded wire connections at subpanel.


Stranded wire is going to flatten some when put under a screw. You can help minimize the strand separation by twisting the stripped portion a little more before putting it under the screw.

As far as using stranded wire on breakers and bars...do it all the time in commercial panels.

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Old 03-18-2011, 12:26 PM   #3
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Stranded wire connections at subpanel.


"I then connected the stranded THWN directly to the double breaker (backfed main), the ground bar and the neutral bar".


Did you feed the panel with a regular two pole breaker or did you mean you fed a main breaker? If you used a regular breaker then you should install a hold down kit to secure the breaker to the bus.
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Old 03-18-2011, 01:25 PM   #4
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Stranded wire connections at subpanel.


A regular breaker. I have the correct hold-down kit for it as well. That was actually the hardest thing to find for this project. Couldn't find it anywhere locally so I had to ebay it. Smallest $9 piece of metal I ever bought.
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Old 03-18-2011, 01:41 PM   #5
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Stranded wire connections at subpanel.


given what you are doing I suspect this is not in question but, make sure the terminals are rated for stranded wire. It's usually not a problem with any new equipment but with older equipment, there are some "solid wire only" rated terminals. The shape of the terminal is a bit different so the stranded isn't confined properly in a "solid only" terminal.
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