Q:I have two black wires running to a light switch that I need to extend about a foot. I cannot identify the hot wire because both wires are black and I have no white wire. Can I cap off both wires and then test each with a voltmeter? If the circuit is not complete, will the hot wire still be live?

ok, a light switch is different then a outlet plug. the black wire is the hot wire and comes in to one side if the switch and goes out the other side. the switch just open the circuit to turn off the light or closes the circuit to turn it on.

Q:In that chart it has 2 sections, one is maximum amps for chassis wiring and the other is maximum amps for power transmission. What is considered chassis wiring and what is considered power transmission?

Chassis Wiring

Q:I have an immersion heater in my hot water cylinder (UK airing cubbard), but the wiring isn't connected. But, I seem to be missing a small piece or two. The previous lead wire from the timer/switch is stil there and has two wires in it. Does someone have a generic wiring digram showing which wires connect to the thermostat and which wires connect to the heating element? Thanks!

Immersion Heater Thermostat Wiring Diagram

Q:Currently I have the two wires no ground wire and some two wire with ground outlets (upgrade some time before). Is it allowed in the NEC to run a separate ground wire from one of the two wire with ground outlet to the two wire outlet without changing the old wires?

better to spend eight dollars and replace it with a GFCI outlet. It will protect every outlet downstream of it if you can determine which one is first. use the labels on all protected outlets.

Q:wire is 4.5 ft from the pole. (a) How much wire is used? (b) How high up the pole is the wire connected?

let w = wire length using trig............4.5/w = sine 10 degrees...................w = 25.9 ft height of wire attachment = w x cosine 10 = 25.5 ft.

Q:the wires are all cut off. which 2 do i connect and which is which and what is what?

Starting with the Instrument panel fuse 20amp, wire is yellow (+) coming from fuse block to the cigarette lighter. Coming out of the lighter is the black (-). If you have a test light find the yellow wire, turn the ignition on to accessories and with the test light grounded the light should come on. Then find the black wire connect the two. If you still can’t get it you can run a 12 gauge wire from the cigarette lighter fuse and then run a separate 12 gauge wire to a good ground on the car. If you are messing with live wires try not to let them arc. If your not getting any power check your fuses. Or don’t smoke.

Q:How much wire is required?

Length of wire is L = R*A/p SI units must be used, so convert radius to meters: r = 0.0254 / 64 m using 25.4mm = 1 inch r = 3.969*10^-4 m (0.3969mm) So cross-sectional area is A = pi*(3.969*10^-4)^2 m^2 A = 4.95*10^-7 m^2 The average resistivity of nichrome is p = 1.1*10^-6 ohm-meter So the required length of wire is L = 2.2 ohm * 4.95*10^-7 m^2 / 1.1*10^-6 ohm-meter L = 0.990 m

Q:Found some electrical wiring resonably priced on craigslist but it says -----8 gauge (AWG), 3 wire, direct burry electrical cableDOES THAT MEAN ITS 3/0 WIRE? Because I need 3/0 wire direct burriedI am looking to buy some extra 3/0 wire and found some on craigslist for a reasonable price..

8gauge 3 wire means exactly what it says. you will be getting a number 8 cable with 3 wires in it...the best thing to do is dig the trench put the wires in conduit and use 3/0 wire..Will last years longer and you probaly will not have to dig your trench back up in a few years.

Q:OK - I removed my old light switch and can see that there are only 2 wires coming out of the wall to be found - 1 white and 1 black. There are absolutely no other wires that I can see back there. The dimmer switch has 2 black wires and 1 green. I'm really not sure what to do. I tried to connect the 2 black ones to the black one and the green wire to the white wire. I admit this wasn't the smartest thing, but thought I'd try. Got nothing. Any help is super appreciated.

If you don't know the basic rule of matching up the colors when wiring something, you may want to avoid doing anymore wiring projects in the future, for your own safety and to keep from destroying your stuff. First of all, turn off the power at the breaker or remove the fuse for that switch. Then: Black to Black, White to White, you can just let the green wire hang or, if you have a metal box, attach it to that. (that's your ground wire, no power goes thru it when things are working properly). Sometimes in older houses (or ones where amatures did the wiring the first time) the colors might not be correctly assigned (usually, black is hot and white is neutral) if your light only flips off and on instead of dimming like it should when you try it, you will have to switch the wires so that it is black to white and white to black (You probably won't need to do that though). Use wire nuts to connect the wires together, not just electrical tape. Good luck and be safe!

Q:When wiring my subs from a positive to negative coil, do I use positive or negative speaker wire?

Speaker wire is speaker wire. There's no difference between positive and negative wire except the markings on the jacket. If you're talking about the bridge wire when wiring a dual voice coil subwoofer in series, just use any piece of wire that's the same gauge as the wires between the other subwoofer terminals and the box terminals.