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Electrical Wiring FAQ (Part 1 of 2)
Section - Why is one prong wider than the other? Polarization

( Part1 - Part2 - Single Page )
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Top Document: Electrical Wiring FAQ (Part 1 of 2)
Previous Document: Testing grounding conductors and grounding electrodes.
Next Document: How do I convert two prong receptacles to three prong?
See reader questions & answers on this topic! - Help others by sharing your knowledge

	Nowadays, many two-prong devices have one prong wider than the
	other.  This is so that the device could rely (not guaranteed!)
	on one specific wire being neutral, and the other hot.
	This is particularly advantageous in light fixtures, where the
	the shell should neutral (safety), or other devices which want to
	have an approximate ground reference (ie: some radios).

	Most 2-prong extension cords have wide prongs too.

	This requires that you wire your outlets and plugs the right
	way around.  You want the wide prong to be neutral, and the
	narrow one hot.  Most outlets have a darker metal for the
	hot screw, and lighter coloured screw for the neutral.
	If not, you can usually figure out which is which by which
	prong the terminating screw connects to.

User Contributions:

Dev
Report this comment as inappropriate
Dec 21, 2011 @ 12:00 am
In a fire protection circuit, circuts are shown witha no example 6,8,4etc. what it mean?these circuits are connected between smode detector,junction box etc
kevin
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Dec 24, 2011 @ 12:12 pm
My daughter dropped a small necklace behind her dresser. The necklace crossed a plug terminal and shorted the receptacle.
I bought a new receptacle and installed the same. I still have no power I suspect there could be a bigger problem,this is aluminum wiring.
I've killed the breaker and call an electrician but am curious as to what happened.P.s. there is a dimmer switch on the same circuit.
dennis
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Feb 24, 2012 @ 11:11 am
Regarding new construction wiring and running 12/2 and 14/3 wire in the same box.

I have multiple switches to lights. Ran 12/2 and 14/3 into switch box and inspector wrote correction needed.

What should I have done instead?

thank you
dennis
Robert
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Nov 26, 2012 @ 9:21 pm
Does a grounding electrode facilitate the operation of a OCPD, to clear a ground fault ?
@dennis
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Mar 18, 2013 @ 10:10 am
Assuming you are installing two switches in a two switch box, you probably should have used 14/2 and 14/3 instead of replacing 14/2 with 12/2. If you are only installing one switch in a one switch box, you should only have one cable in the box.
P k
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Jan 26, 2014 @ 10:10 am
I prefer to use nothing smaller than12 awg /the smallest sized wire on a circuit determines the allowable ampacity
Ex: 15 amp-14awg. 12awg-20amp only rule for thumb other factors such as continuous load,heating and others if you do not know the safe NEC rules then please call a qualified journeyman Electrician better be safe

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Top Document: Electrical Wiring FAQ (Part 1 of 2)
Previous Document: Testing grounding conductors and grounding electrodes.
Next Document: How do I convert two prong receptacles to three prong?

Part1 - Part2 - Single Page

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Last Update March 27 2014 @ 02:11 PM