17 votes

Main water supply's grounding wires

The jumper is there because the meter assembly is removable. It can't be relied on for continuity and if it is ever removed for repair or replacement, you don't break the ground connection. Even with ...
  • 2,372
17 votes
Accepted

Why might Siemens imply GFCI breaker will reduce protection on 3-wire dryer circuit?

The old clothes dryer receptacles were NEMA 10-30. This had two hots and a neutral, but no ground. That is because going way back nothing had grounds. As grounds were added (witness the progression ...
12 votes

Living room breaker will not turn on after pressure wash

Hire an Electrician It's time to get a licensed pro to fix this. Yes, this is a DIY forum, but for someone who only knows to wait 24 hours and then replace a circuit breaker, it's time to get real ...
11 votes
Accepted

110.15 High-Leg Marking

The excerpt is referring to marking inside a 3-phase panel. Unlikely that you'd see that in residential in the US/Canada, but they do exist here and there, especially in mixed-commercial space that ...
  • 2,372
9 votes

Main water supply's grounding wires

From the photo, it looks like the ground wire goes to the left side of the meter, then loops across to the right side. This provides the jumper as required. The jumper is to prevent nasty surprises ...
  • 1,885
8 votes

I installed some wire nuts, but they push back on the cover when closed

Consider using UL-listed lever nuts such as Wago 221s. IMO they are much better for DIY homeowners than traditional wire nuts. To address your main concern, that you have limited space in the small ...
  • 20.3k
8 votes

What remedy for electrician's large holes in studs?

The upper one looks like <40%. Those "on a sweep" spots require a tall notch like that. I know you want to see only the wood removed which is in the way, but that requires magic. The ...
8 votes

Can I have 2 boatlift motors (rated for a total of 22 Amps), on a old 20 amp circuit if I replace the circuit breaker with a 30amp breaker?

Only if you like electrical fires. The reason that we use breakers in the first place is to prevent wires from being dangerously overloaded. Compare the wire for your cell phone charger to the wire ...
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7 votes
Accepted

What would cause a power tool like a paint sprayer to trip a GFCI circuit?

Start with: "What does a GFCI trip on?" A GFCI is looking for GF's, or Ground Faults. To be more precise, it is comparing current on the hot wire vs. current on the neutral wire. If those ...
6 votes

Main panel grounding modification (two grounds in box to single ground wire)

Grounding wires must be continuous from the main panel to each of the places they are going (ground rod and water pipe, same as in my house). As I understand it (and I went through this recently with ...
6 votes
Accepted

Does NEC require junction boxes to be accessible without tools?

There are a few different "access" issues that get thrown together. Sorry, I don't have NEC specific references here, but this is based on a lot of Q & A I've read over the past several ...
6 votes
Accepted

Do conduit nipples have to be straight?

"nipple" is just a buzzword used to describe a pipe or conduit run that is short. Nothing says conduit runs can only be 24". The only 24" related rule I can think of is that If ...
5 votes
Accepted

Main water supply's grounding wires

Even if the main electrical ground connection is on the street side of the meter, it's not unusual for appliances (such as a dishwasher or washing machine) to have ground wires running to the nearest ...
  • 1,291
5 votes
Accepted

Main panel grounding modification (two grounds in box to single ground wire)

No can do. Those are your Grounding Electrode System wires, and those cannot be spliced by any craft that we here possess. Crimping them legally requires specialized kit only an electrician is going ...
5 votes

What remedy for electrician's large holes in studs?

It is a stud. Even if this is a load bearing wall. Let's take the worst case scenario, the hole the ele cut splits and the stud fails, what is going to happen? This wall appears to have drywall on ...
5 votes

Does NEC require junction boxes to be accessible without tools?

All junction boxes and conduit bodies I've ever used do require tools to open because they are secured by screws. The question should be, how do you access the wiring? Look in Article 100. "...
5 votes
Accepted

AC disconnect auxiliary/service outlet wiring

There is no need for a 120V circuit to be part of a mini-split installation. People often get confused by this because of a clause in Code. That is there to address the needs of the A/C maintainer to ...
5 votes
Accepted

When drilling holes in a wall, how do you make sure you don't hit an electrical wire?

Start by searching online for "cable detector" - there are single & multi-task devices, live cable, pipe-work, stud wall. If you have literally no clue what may be in there, check for ...
  • 5,335
4 votes

Living room breaker will not turn on after pressure wash

There is still one thing that isn't clear to me. You said you replaced the breaker but still no power on that circuit. Does that mean the new breaker immediately re-trips when turned on, or does it ...
  • 2,372
4 votes

Where is the neutral hooked up to this old fuse box?

Neutral is being fed through fuses here This panel is so old that it appears to have fused neutrals -- i.e. neutral is one of the fused/switched busbars in this panel, while the only hot is the other ...
4 votes
Accepted

Installing outlet in electrical box with two sets of wires?

Black or white? Does it matter? It matters a lot. You need to learn the basics before you start messing with electricity. While this particular situation looks pretty straightforward, it might not be....
4 votes

How many #12 wires are needed for 240V and 120V circuits in a shed in metal conduit?

The welder circuit will not use neutral at all. There is no need to run a white wire. There is never any sharing of neutral between circuits. This is not allowed, ever. (MWBCs are one circuit). If ...
4 votes

Improving Well Pump Wiring for Portable Generator Use

this doesn't seem up to code. The circuit bypassing the mandatory disconnect. the UF-B cable having zero physical protection e.g. conduit. It needs physical protection down to its 24" burial ...
4 votes

Can I have 2 boatlift motors (rated for a total of 22 Amps), on a old 20 amp circuit if I replace the circuit breaker with a 30amp breaker?

No, because you probably only have 12 gauge wire running from the breaker to the boat motors. 12 gauge wire needs to be protected with a 20 A (max) breaker. I had a similar situation, but I had two ...
  • 4,478
4 votes

Service Entrance Wire To Drop Splice - 200AMP

Your domain / right-to-touch ends at the weatherhead. You should not be touching the service drop wires or the crimps, as they are the exclusive domain of the power company. Other than the wires ...
4 votes
Accepted

Service Entrance Wire To Drop Splice - 200AMP

Usually the electric utility provides their own connector for splicing their conductor to the customer's conductor. I'd expect to install the mast and conductors, then leave the provision and ...
  • 21k
4 votes

Can I cover conduit bodies alongside a service panel with plywood?

By code panel C must open without tools. You could use hinges and a cupboard door catch, or magnets, etc. Another option could be to swap the back-exit conduit body with a side-exit body (left, in ...
  • 15k
3 votes

Does NEC require junction boxes to be accessible without tools?

314.29 Boxes, Conduit Bodies, and Handhole Enclosures to Be Accessible. Boxes, conduit bodies, and handhole enclosures shall be installed so that the wiring contained in them can be rendered ...
3 votes
Accepted

recommendation for wiring a new microwave using existing circuit(s)

Can you post a picture of the inside of the panel with the two breakers in question in the frame? That would help confirm how they have you wired. What we can assume from your description and the ...
  • 2,372
3 votes

When drilling holes in a wall, how do you make sure you don't hit an electrical wire?

Depends on your local electrical codes. In El NEC countries, and probably Canada, Code requires that any electrical cables and pipes be at least 1-1/2" below the finish surface, or else have a &...

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