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2 votes

50 Amp plug but 30 amp breaker

This is a common mistake that I admit I have answered incorrectly in the past. There is a table in the 2020 NEC (See note below): It's easy to quickly say "that's the rule, we're done here",...
NoSparksPlease's user avatar
0 votes

50 Amp plug but 30 amp breaker

If you are putting in a 50 amp outlet, you should put in a 40 or 50 amp circuit. 'Why is 40 a possibility?' you may ask. It's possible to use a 40 amp circuit on a 50 amp outlet because there is no ...
KMJ's user avatar
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4 votes

Can you wire something in parallel to a light switch?

One quite common "gotcha" is that the switch may not have a complete power connection for you to splice to. If the switch was installed at a time or in an area where NEC 2011 did not (or ...
Ecnerwal's user avatar
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3 votes
Accepted

What is the right box fill for my 1x30A circuit and 2x20A circuit case?

The shared ground needs to be #10 since one circuit has wire rated for 21-60 amps. For a 30A circuit, #10 conductors will suffice unless it is aluminum. Wires which pass thru a box only count as 1 ...
Harper - Reinstate Monica's user avatar
1 vote

What is the right box fill for my 1x30A circuit and 2x20A circuit case?

You have: 3 #8 conductors passing through the box. 8 #12 conductors entering the box and spliced there. 1 #12 ground wire. For which my calculator says you need a 29.3 CI box.
Huesmann's user avatar
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2 votes

Which small (1-gang) surface mount box is code compliant with NEMA 14-30R receptacle?

A frame challenge: Your linked "Carlon" box is a surface mount box. What about replacing both box and insert with a surface-mount 14-30 outlet? https://www.homedepot.com/p/ELEGRP-30-Amp-125-...
Triplefault's user avatar
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3 votes
Accepted

Which small (1-gang) surface mount box is code compliant with NEMA 14-30R receptacle?

The links you posted include dimensions, and based on those it doesn't seem like it would fit. The outer metal frame seems too big for the box. Receptacle: 2.46" W x 3.69" H x 2.26" D (...
peter's user avatar
  • 1,347
3 votes

Which small (1-gang) surface mount box is code compliant with NEMA 14-30R receptacle?

Will that box work? I guess it probably would. But use a metal box instead. See this post for some reasons why. Typical is to use a 4" box and a cover such as this one from Home Depot:
manassehkatz-Moving 2 Codidact's user avatar

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