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post #1 of 63 (permalink) Old 07-28-2016, 12:14 PM Thread Starter
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First of all, I know less than nothing about wiring and electricity in general. My garage was wired using Hubbell Twistlock receptacles. I have need of a 6' - 8' extension cord for my Contractor saw. I know that there is a standard for each color wire, but does it matter on an extension cord, as long as same color wire goes to the same lug on each end ?

Thanks....Gary
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post #2 of 63 (permalink) Old 07-28-2016, 12:43 PM
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Gary. Yes, colour coding matters. All the time.
Black wire to brass screw, white wire to silver screw, and green (or bare)wire to green ground screw.
Say you have a 100' cable, and you need to cut into it somewhere in it's length ...to repair or add a device, a switch say...if the colour code isn't followed religiously how would you know what to connect to what at the intersection? In a light fixture, for example, the brass screw ...the hot wire always goes to the bottom of the socket! If you hooked it up to the silver screw you'd be sending electricity to the threaded shell; potentially letal if you're up on a ladder for example.
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post #3 of 63 (permalink) Old 07-28-2016, 12:54 PM Thread Starter
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Thanks Dan ! I am printing out your reply so I can use that to do it right.



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post #4 of 63 (permalink) Old 07-28-2016, 12:58 PM Thread Starter
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It looks like with the Hubell twistlock plug, it is Brass, Brass, Green for the screw colors. So I will need to be careful to get the wires to the same screws.



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post #5 of 63 (permalink) Old 07-28-2016, 01:06 PM
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Dan is exactly right. The black wire is the "hot" wire while the white is the neutral. Green is an earth ground, meaning is most likely connected to a ground rod or a metallic water pipe somewhere near the meter. You should not be able to measure the line voltage between the white and green (or bare copper) wires. The wire colors must be matched exactly all the way from the source (typically a wall socket) to the load (a lamp, a motor, a tool, etc.). Mixing up the wire colors presents a potentially dangerous situation.
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post #6 of 63 (permalink) Old 07-28-2016, 01:27 PM
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Gary, use the following as your wiring guide for a Hubbel.

https://en.wikipedia.org/wiki/NEMA_c...ified_pins.svg

The upper left hand picture for L5-15 is the correct one for your application. It shows the receptacle (socket) side. For the plug, reverse the black and white so they'll connect correctly...black to black, white to white, etc.
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post #7 of 63 (permalink) Old 07-28-2016, 02:29 PM
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If the the saw is 220 volt then it`s best if your extension has a red and black and green. There is no neutral wire in that situation. It isn`t always possible to find stranded wire in those color codes, you may only be able to find black, white, and green. In that case both white and black are live conductors and green is ground (always, no exceptions on that color).

There are cases in house wiring where both white and black wires are live such as when the power feed to a light goes to the light receptacle first and then to a switch. The power goes from the light to the switch and comes back to the light also hot when the switch is turned on. Some inspectors I`ve dealt with like to see the white wire wrapped at the ends with either black or red electrical tape so that anyone looking at it will realize that it is not a neutral wire. You could do the same if necessary with your extension cord if it`s 220 and you can`t find red, black, and green in a flex cord.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #8 of 63 (permalink) Old 07-28-2016, 02:43 PM Thread Starter
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Just so I am being clear. The ends are a HBL 2321 and a HBL 2323. The difference as far as I can see from the NEMA is that the ground is turned in a different direction, which I am assuming really doesn't matter. I guess they are sort of similar to the NEMA L5-20.


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post #9 of 63 (permalink) Old 07-28-2016, 02:45 PM
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*deleted/duplicated*

Last edited by DaninVan; 07-28-2016 at 04:58 PM. Reason: duplicated
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post #10 of 63 (permalink) Old 07-28-2016, 02:52 PM
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This is the reason they started producing NMD90 Electric Heating cable. It contains a Red, a Black, and a Green wire. It's specifically for 220V wiring, ie no Neutral (White).
The outer sheath is Red so it's clearly indicated as a dedicated electric htg. cct.
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