41
votes
Accepted
Why is my circuit breaker being tripped after removing a light switch?
STOP
Sorry to be blunt, but you have no idea what you are doing and it is only because you have good circuit breakers that your house has not burned down. Seriously.
A few key pieces, but nowhere near ...
28
votes
Accepted
Is it safe to use the ground as a neutral when other grounds are available?
What could possibly go wrong?
If the ground wire is bare copper, you massively increased the risk of a ground fault, which can kill somebody or burn the house down.
If the ground wire has a smaller ...
- 771
19
votes
Accepted
Are all switches in a 4-way circuit the same?
Note - these remarks are from a North American perspective, but I believe switching is done the same way in Europe.
Switch terminology can be confusing but once you understand it, it is pretty simple....
- 25.2k
18
votes
How to reverse a three way switch?
Don't make it harder than it is lol.
Pick either switch. Flip it over.
3-way switches are symmetrical. They do not have an "on" and "off" legend.
So no wiring is needed. Remove ...
16
votes
How to reverse a three way switch?
Swap the travelers at one end
Pick one of the two switches involved, and with the power off, swap the two traveler wires so they land on the other traveler terminal on the switch compared to when you ...
- 85.2k
15
votes
Accepted
Three way switch with two common wires?
Notice how the two terminals are brass? Those are travelers. You'll save yourself a world of confusion if you get a 5-color pack of electrical tape and mark the traveler wires yellow. Every 3-way ...
15
votes
Is it safe to use the ground as a neutral when other grounds are available?
You have ground being used as neutral. That is a serious code violation and can cause a number of dangerous problems.
In the old days, the only real solution would be to run a new cable. Fortunately, ...
13
votes
Bizarre behavior after replacing a three-way switch
All three way switches have two travelers and one common. But the positions vary. Usually the traveler screws will be one color (eg brass) and the common another (eg silver). Figuring out which wires ...
12
votes
Incorrect voltage at light sockets
In residential interior wiring, voltage irregularities generally are only a concern when over-voltages are seen and not under-voltages. Incidentally however, when there is an under-voltage, there is ...
- 4,847
12
votes
THHN through EMT - then convert to Romex?
You can transition wiring methods at a junction box. Use the EMT wiring method up to the junction box (whole nine yards with fittings and clamps). Then use the NM wiring method beyond it. The ...
12
votes
Accepted
Can I run my three-way travelers in a 14/2 without a neutral in the cable?
This is not allowed because it violates the rule that in any cable there must be two conductors carrying equal current in opposite directions so the magnetic fields cancel. That T- T Loop top right ...
- 22.5k
11
votes
Accepted
Can I Swap Ceiling Fan and Light Wires?
Yes, you can do that and it will swap the power to the light and fan. Just remember to turn off the power at the breaker before doing any work.
- 83.8k
11
votes
Accepted
How to wire two different 3-way circuits from same box
hot lead... to the top (brass) screws of each of the 3-way switches... The red and black travelers from the bottom two screws (brass and black)
I think you're in for a big surprise on that ...
10
votes
Accepted
Incorrect voltage at light sockets
It's a floating neutral.
But it's only the one circuit.
Find, re-strip, re-splice, and tighten down all of that circuit's neutral connections. If it goes directly through an outlet, pigtail it.
- 13.5k
10
votes
Is it safe to use the ground as a neutral when other grounds are available?
I'm assuming by drain, you mean neutral. Ground wires can not be used as any other conductor, repurposed. If its green insulated or bare copper, then it must be used as a ground and only as a ground.
- 83.8k
10
votes
Why is my circuit breaker being tripped after removing a light switch?
I joined the neutral wire that was attached to this switch to the rest of the neutral wires (I don't fully understand neutral wires).
That right there.
#1 that wasn't a neutral wire.
#2 even if it ...
10
votes
Run single strand of K&T wire through conduit under floor?
I can't say it is official code. But my hunch is that even if code may technically allow reinstalling knob & tube in existing circuits, it is not a good idea. Certainly if anything goes wrong, ...
9
votes
What is the correct way to wire a 3 way switch where power comes into the middle switch?
You'll lose your mind dealing with all the red black white business. Get a 5-pack of colored electrical tape and start marking wires for their actual function. Always mark wires the same at both ...
9
votes
Light Fixture Stopped Working After Replacing Its Three-Way Switch
DON'T try random stuff when you get stuck
Trying to replace actual knowledge with "throw things at the wall and see what sticks" is a fatal error when dealing with electrical equipment. Why? The ...
9
votes
Three way switch with two common wires?
In your photo the the round holes you've circled at the top are the backstabs for the travelers for the switch. They're quick connection terminals that are known to be unreliable. You want to shepherd ...
- 83.8k
9
votes
Can 3-way wiring that works be wrong/dangerous?
This is safe as long as the black, red-black, and white-black wires between the switch boxes are all in a single conduit or cable. That is, the switched-hot and the two travelers must be physically ...
- 14.8k
9
votes
Should my smart switch be connected to the neutral wire from another cable?
You can't take neutral from other cables.
NEC 300.3.
Neutral can only be taken from cables that already have wires going to the switch. This is a big problem on the far end of a 3-way, where neutral ...
9
votes
What does a 3-way switch with neutral and black tape mean?
These switches don't have any neutral wires.
The white wire is being used as a traveller. NEC requires the wire be identified with a marking such as black tape to indicate it is not grounded.
- 6,799
8
votes
3-way switches no longer serving their purpose
My understanding from the description (very good by the way) is that you have two duplex receptacles that have the two upper outlets both simultaneously controlled by the three way switches. The ...
- 14.1k
8
votes
How to reverse a three way switch?
Two approaches:
On the switches you SHOULD have two terminals in one color and one terminal in another color. Not all switches are built this way. But if you do, just on one switch swap the two ...
- 43.5k
8
votes
How to reverse a three way switch?
To explicitly answer your question here:
Is there an "algorithm" for the order with which to flip the switches in order to get to my desired state (both switches down = off)
No. Here's why:...
- 81
8
votes
How to wire two different 3-way circuits from same box
Try like this:
The power "line" leads from each set of 3-ways are wire-nutted together to the wires from the panel in parallel.
Grounds are all connected, too, of course.
- 8,981
8
votes
Accepted
What does a 3-way switch with neutral and black tape mean?
Neutral must be white(or grey),over a certain gauge size(I think it is 4 gauge and larger that can be marked as neutral).
White does not mean neutral. It should be marked as in your example, but ...
- 28.3k
7
votes
Incorrect voltage at light sockets
Everything you are saying depends on where the electrician checked the voltages. Dimmers will affect the voltages on the load side. So did the electrician check for voltage drop across the dimmers ...
7
votes
Can I Swap Ceiling Fan and Light Wires?
That should be fine. The only question is how many neutral (white) wires are connected and if two, are they connected to separate wires to the fan. If there are two and they connect separately, you ...
- 13.2k
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