Distribution and use of electricity throughout the home. Electrical standards vary greatly worldwide, so providing your location in your question or your profile helps ensure you get answers that are relevant to you.

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2
votes
4answers
12k views

How can I calculate the power consumption of an A/C unit?

I have an AC unit with the following specs: Cooling Capacity: 1260 kcal/h, 1.47kW, 5000 Btu/h Fan Motor Power: 0.034 kW Current: 0.155 A My question is how much power does this unit actually ...
2
votes
2answers
656 views

What are the code requirements for installing a ceiling fan alongside a fire sprinkler?

I have a fire sprinkler in my bedroom ceiling which is right in the middle. I want to install a ceiling fan. What are code requirements to follow?
3
votes
2answers
6k views

Why doesn't my motion sensor light work?

I want to install a simple motion sensor (Lutron Maestro MS-OPS2) on a single pole switch in my garage. When I installed it the light would not turn off. The instructions (PDF) that come with the ...
3
votes
1answer
3k views

How does a multi-tap motor speed control work?

I have a Home Depot, undocumented, no-name ceiling fan and I've messed up the speed control connections, and I'm trying to understand how the circuit works. I found a circuit on the internet which ...
3
votes
2answers
11k views

How can I install a ceiling fan, recessed lights, and receptacles on the same circuit?

I believe the configuration in the image below is what I need in order to power a ceiling fan and recessed lights on two separate switches out of a two gang box using the existing cables. However, ...
1
vote
0answers
55 views

What size of transformer do I need if I have to bring a 208Y/120V service to a structure and the power company provides a 480 V service? [closed]

Can I use a 150 V, 250 V, 300 V, or 400 V transformer for a 208Y/120 V service to a structure with the power company providing a 480V service?
1
vote
1answer
442 views

Can I install a subpanel using only two ungrounded (hot) conductors and a grounding conductor?

we removed the inside part of an air conditioner / heater from a mobile home. we plan to use this area as a small pantry. The wires that were connected to the heater is 2 black connected to 2 seperate ...
2
votes
1answer
183 views

Finding one power wire to two lite switches. ugh!

I bought this house one year ago, have had some problems with its electrical. My bathroom switch controls bathroom clothing closet light and the bathroom light. I notice it really sounded funny at ...
3
votes
1answer
9k views

Sump Pump Trips GFCI Receptacle. Is a single, dedicated non-GFCI receptacle safe?

I recently replaced my sump pump in one of my two sump pits. To comply with codes, I replaced the outlet with a GFCI type outlet. Unfortunately, once I turn the power back on, the GFCI trips ...
0
votes
0answers
106 views

What should the voltage be on an unused neutral line in a 3-phase supply?

I am currently setting up a machine in a trade show. The machine uses 480V 3-phase power with no neutral needed. The show electrician connected the power to the machine and just taped off the neutral ...
4
votes
3answers
23k views

Why does my laptop charger make a spark when plugged in?

From time to time (not always but often enough) when I plug my laptop's charger in the wall outlet it makes a spark (even if I use different outlets it's the same). Why does it do this? Is this a ...
0
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0answers
233 views

Is a standard power outlet sufficient for a 2.8 kW oven?

I'm moving some of my kitchen appliances around, where the oven is going where the Dish Washer was. The Consumer Unit has just a single breaker for all kitchen appliances (except the cooker hob, which ...
1
vote
1answer
215 views

What does this (electrical) value mean on my washing machine's back?

The electrical parameters of my washing machine are printed on the back. Among them there is a value for amperage: It says 10A but I don't know if that means that I need a fuse of minimum 10A or ...
6
votes
1answer
47k views

What size wire should I use to feed a subpanel in my garage?

My main panel has been upgraded to 100 amps. I would like to add a subpanel in the garage which would supply: 20 amp Mig welder running on 120 volts, but later upgrade to a larger Mig welder as i ...
0
votes
0answers
183 views

What type of junction box cover do I need?

We are building a set of shelves to cover up a sewer pipe in my basement. The shelves will have a false back that covers the pipe then have usable shelves in front of it. The only problem is that ...
5
votes
4answers
8k views

How to add indicator on a light switch to indicate the outdoor 3-way light is on?

Have some carriage lights outside my garage that can be turned on from inside the house. It's common that the switch will get flipped and the lights will stay on when they're not wanted. Is there ...
1
vote
1answer
866 views

Can I substitute halogen bulbs for incandescent bulbs?

Instead of three 40w light bulbs, can I use only two 43w halogen light bulbs in a ceiling light fixture with 3 lamp sockets rated at 40w maximum per socket?
2
votes
2answers
826 views

Is it against NEC code to re-use pulled cable?

I'm re-wiring parts of my house and have pulled some 12/2 out. Is it against NEC code to re-use that cable? I didn't have to pull that hard to get the cable out and there doesn't appear to be any ...
7
votes
1answer
561 views

How should this circuit be properly grounded?

I am hiring an electrician to do the work so my question is more for my education and helping me ask the proper questions to the perspective contractors. Purchased a condo recently and want to put in ...
1
vote
1answer
2k views

Can 22 AWG Solid Copper carry 24 VAC?

I have this irrigation caddy unit, and it requires 24VAC. There's a location outside my house with one ethernet cable and another brown cable with four solid copper wires (black, red, yellow, green). ...
2
votes
1answer
285 views

Is it possible that this GFCI receptacle is grounded without an equipment grounding conductor being connected?

I was attempting to upgrade an old outlet to a GFCI outlet. There are only two wires one black and one white. There is no ground wire. However the receptacle tester read "correct wiring". Is it ...
1
vote
1answer
213 views

Joining 8 wires into one

I have the cables from 9 bulbs joined into one using a screw terminal temporarily. What is the best thing to use to do this in a way that's waterproof and suitable for outdoor use. Whatever i use ...
6
votes
1answer
409 views

Is it okay two breakers are controlling the same outlets and appliances?

To be specific, we recently had some electrical work done. The electrician added a second panel. He left without labeling anything. So today I've been testing outlets and switches trying to figure out ...
1
vote
4answers
254 views

What does wire loops on the wall for?

I bought a house recently, and there are wires in the walls under stucco. But in basement these wires are go out as a loops not far from the ceil. What are they for? Are they for lamps? If yes, then ...
2
votes
2answers
2k views

What are the pros/cons of different wire connectors on a switch/outlet? OR How can push-in wire connections fail?

Prompted by an answer on Concerns about replacing a worn out light switch Also related: When to use holes instead of side terminals to wire an outlet To my knowledge, electrical components ...
4
votes
5answers
6k views

Will switching to LED lightbulbs make a significant difference in my electric bill?

I asked Reliance Controls about a THP103 meter that I was having trouble with. Turns out that it's not a true RMS meter and thus is unable to give you accurate readings on a CFL or LED installation. ...
0
votes
1answer
151 views

Why Does Over Kitchen Sink Fluorescent Use More Watts Than Bulb Says [duplicate]

I have an Efergy Elite unit that measures the watts used for any circuit its connected to. Right now I'm using it to monitor the circuit with our fluorescent light over the kitchen sink and something ...
5
votes
4answers
3k views

Concerns about replacing a worn out light switch

Our home is about 3 years old. New construction. New parts. The main lights in the kitchen are a 4-way circuit (3 switches, + lights). Since we primarily come into the room from one side, one ...
7
votes
3answers
1k views

Why am I getting strange results when using a power meter to measure CFLs?

Over the years we have replaced just about every bulb in the house with a CFL. But here is the problem. Our electric bill is going up and not down. When I moved here 3 years ago we spent about ...
6
votes
2answers
9k views

How do I install this flush-mount ceiling light?

I bought a new flush-mount ceiling light and am having a tough time figuring out how to get it installed. The instructions that came with it are completely useless. Here are all of the pieces that ...
0
votes
2answers
1k views

can we use UPS as stabilizer for 1.5 ton AC?

I bought split A.C 1.5 ton Samsung AR18FC5efbh model. Can I use an 800VA Microtek UPS as stabilizer for this 1.5 ton A.C? AC Specs ...
2
votes
3answers
978 views

Any problem with installing two identical circuit breakers in series?

Suppose I want to reduce risk of a circuit breaker malfunctioning and failing to disconnect a shorted circuit. What if I install two identical breakers sequentially (one after another) so that if one ...
0
votes
1answer
146 views

Why do I detect voltage on my ground of surge protector?

Renting an older home and upon moving in was saddened to see outlets without grounds (two prongs). So, for one of the outlets I bought a 2 to 3 prong with ground clip and ran the ground to some vent ...
0
votes
0answers
101 views

Terrarium electric board

[hope this isn't off topic for this board] I'm doing a DIY electric board for my terrarium: in case something goes wrong at least the whole electric circuit won't switch off. My current setup is a ...
2
votes
1answer
452 views

How do I detect live electrical wires with a degree of confidence?

I'm using a Zircon stud finder that can supposedly detect live electrical wires but I get inconsistent reading. Is this normal? Anyways back to the original question, how can I detect live electrical ...
1
vote
0answers
325 views

What is the part name/type for my fridge door sensor connector?

I have a three-door LG fridge. Each door has a button that gets pushed in when the door is closed, so it can turn off the light, etc. The button is connected to the wiring with a U-shaped plug ...
0
votes
1answer
1k views

One switch controlling 2 lights

I am replacing a 3-way switch that controlled two lights in a bathroom. There is only one switch, but controls two lights. The old switch worked fine. But now when I replaced it, in one switch ...
3
votes
2answers
434 views

Does NEC allow for recessed lighting to be placed in a vertical wall?

I am about to start running electrical in my bathroom remodel and I am considering options for lighting. I have a wall on one side that has 5.75" of space (this was for recessed shelving in an ...
0
votes
2answers
669 views

What do the buttons on a Comelit Okay Simplebus2 Intercom/door entry system do?

I've got a Comelit Okay Simplebus2 door entry system which yesterday wasn't able to be used to let someone into the building, however I'm not sure if the buttons next to the phone were being used ...
0
votes
0answers
28 views

dual GFCI circuits with multiple protected outlets, all sharing a neutral [duplicate]

I'm trying to wire two GFCI circuits sharing a neutral. The line is coming in from a 2-pole circuit breaker. I want to have two circuits at each location, each protected by a GFCI upstream. ...
3
votes
5answers
16k views

What is causing my circuit breaker to trip instantly and trip the next breaker too? Update - Video Added

One of my circuit breaker trips instantly. I try to reset it but it trips immediately and trips the breaker under it too. I can reset the break next to it and it is fine until I try to reset the ...
2
votes
3answers
359 views

Why can't I measure 240V on this wall heater wiring?

I am replacing a 240V wall heater. I get 120V from black to ground but 0V from black to white and 0V from ground to white. Is this correct? The old heater worked but not really well. There was a ...
5
votes
2answers
715 views

Can 18/2 CL2 barostat cable be used for speakers?

We're wiring our kitchen for a stereo speaker system. There was only enough 18 gauge speaker wire for one speaker, so the electricians used 18/2 barostat wire for the other. The speaker cable seems ...
2
votes
1answer
596 views

Is it safe to use a 50 metre (164 foot) mains extension cable?

Amazon UK sell 50 metre extension cables that use standard UK plugs: http://www.amazon.co.uk/Silverline-200084-Metre-Cable-Reel/dp/B000LFZ49Q/ref=sr_1_1 Is it safe to use an extension lead this ...
5
votes
1answer
4k views

Can I run a 50 amp circuit underground?

I need to run a 50 amp circuit (120/240V) from a shed to a travel trailer that is permanently in place. The previous trailer had 30 amp 120V service running underground to a mounted/covered outlet ...
2
votes
2answers
15k views

Is it okay to not connect the grounding wire to a ceiling box?

Is it ok to connect the ground wire of a new light/fan fixture to the ground wire of the house without connecting them to the ground screw in the outlet box? The new ceiling fan/light had a ...
2
votes
1answer
18k views

What should I do with the extra grounding wire in my ceiling fan box?

I am installing a Hampton Bay Ceiling Fan that has a transmitter install for the remote. I have a green ground and a bare copper ground coming from my ceiling box. I have a green ground coming from ...
2
votes
2answers
26k views

Ceilling light wont switch off after a new installation

I have bought a new ceiling light to replace an old-fashioned one. I have 3 grey cables hanging from the ceiling: 3 red wires connected together and 3 green wires connected together and 3 black but ...
0
votes
0answers
493 views

How do I appropriately wire the transformer in a light fixture?

I'm replacing a dinning room light fixture, but it differs from the one that was there. Can anyone tell me how these wires should be attached? The black and white wires lead to the halogen lights, ...
4
votes
1answer
796 views

How can I add a switch to separately control a light and fan?

I have a single switch that turns on/off both a light and a fan. How do I add a switch so that each is controlled by its own switch?