17 votes
Accepted

Does NEC allow a metal box to carry the ground connection between separate conductors?

This is fine NEC 250.109 explicitly permits metal boxes to be part of the ground-fault current path: Metal enclosures shall be permitted to be used to connect bonding jumpers or equipment grounding ...
ThreePhaseEel's user avatar
10 votes

Does NEC allow a metal box to carry the ground connection between separate conductors?

ThreePhaseEel clicked Post before me, but here's what I was working on... Metal extension rings are self-grounding when installed properly. They are treated as part of the box. As long as you re-...
Robert Chapin's user avatar
8 votes

Can I run wires from separate panels through the same conduit?

Note that everything here assumes you are using individual wires, not cables. 12/2 and 10/3 usually refer to cables but also work as shorthand for "2 12 AWG wires plus ground" and "3 10 ...
manassehkatz-Moving 2 Codidact's user avatar
6 votes

Loud bang beneath the house, lights flickered

A loud bang combined with a breaker tripping is cause for concern. If the house has a basement, try to follow the line that tripped to see if you can find the damage. If you can live without that ...
Cheery's user avatar
  • 4,853
3 votes

no power in the ceiling wire

Generally speaking when you rent an apartment you can't do your own electrical work. That's for two very important reasons: Anything that goes wrong and it can become a shouting match between ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes
Accepted

How should spades be attached to high voltage wiring?

Crimps suitable for solid wire are available (eg Tyco 4-520448-2), but your plan to use pre-fabricated flex pigtails is also a valid alternative.
Jasen's user avatar
  • 20.6k
3 votes

Sand/silt in my well water after a power outage

At a guess, some insignificant amount of sand was suspended in the well pipe. Once pumping stopped, it settled to the bottom, and the came out in one noticeable "lump" when pumping restarted ...
DrMoishe Pippik's user avatar
2 votes

Can one load be controlled with three 3-way switches?

There is such a thing as a "4-way switch". A three-way is SPDT, used to select between the two travelers. A four-way is DPDT, sitting in the middle, wired to either pass the travelers ...
keshlam's user avatar
  • 28.7k
2 votes

I have a 100a service and 200a main and meter base. With 200 amp cord

If you have a 100A service, then if you follow the wires from where the service enters your house, the first breaker you encounter must be 100A or less. This is to avoid overloading your service feed. ...
Bart van Ingen Schenau's user avatar
2 votes

Can I reduce wire gauge downstream of a limited-current relay?

Any wire you add between the devices has to meet the required ampacity for the circuit. The manufacturers of relays and pumps get to use thin wire because they test for UL listing with thin wire. In ...
KMJ's user avatar
  • 11k
2 votes
Accepted

What should I do with old switch wires?

No you cannot just put a nut on a wire and shove it back into the wall. Why? What happens if you accidentally knock that nut off while installing the new box and don't notice? That's why. Plus code ...
FreeMan's user avatar
  • 47k
2 votes

Changing a 3-way switch to a smart switch that controls a bank of outlets

Frame Challenge This is NOT a good idea, even if you can make it work. While code allows for switched receptacles as an alternative to switched hardwired light fixtures, there are some serious power ...
manassehkatz-Moving 2 Codidact's user avatar
2 votes

Extension Cord Coming Out of Kitchen Wall Possible NEC Code Violation

Extension cords have never been legal as installed wiring. (Sort of) good news, though. From the picture that doesn't appear to be an extension cord. Rather, it's a receptacle installed on the end of ...
KMJ's user avatar
  • 11k
1 vote

How to replace two terminal surface radiant with a 4 terminal of a cooktop

You have amply confirmed that it is the burner that is at fault. If Whirlpool tells you to use a replacement that has a different number of connections, then it is reasonable to take them at their ...
Jim Stewart's user avatar
  • 21.6k
1 vote

Do I need a special switch for a bathroom fan?

Simple switches - old-style toggle switches or Decora switches - are really easy. Turn off the circuit breaker or breakers. Most likely you have one breaker that controls both the fan and the light, ...
manassehkatz-Moving 2 Codidact's user avatar
1 vote

I have a 100a service and 200a main and meter base. With 200 amp cord

If by "cord" you mean the feeder, and the first breaker it hits is 200A, you have 200A service. If the feeder isn't rated for 200A, but is wired from a pole rather than underground, and the ...
keshlam's user avatar
  • 28.7k
1 vote

Wiring question for a multi wire branch circuit

The minimum gauge on a 20 amp breaker is 12 gauge, so no 14 gauge wire is allowed(except what is provided on a UL listed device). That 14 gauge wire is not allowed by code. The fixtures instructions ...
crip659's user avatar
  • 23.7k
1 vote

Two bathrooms fans on same switch. One runs continuously

Presumably the one that runs continuously is intended to do that to "help with the mold problem" and the other is supplementary to deal with large amounts of moisture from showering, etc. As ...
Ecnerwal's user avatar
  • 210k
1 vote

How do I wire my new ceiling fixture?

This looks like normal old wiring for a ceiling light. You've got power coming in, and power going out and a switched hot controlled by a switch. Take your new fixture white wire and connect it to ...
JACK's user avatar
  • 79.9k

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