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When adding an additional outlet off an existing one with Wiremold, does the new outlet box need to

Author : Colin

Submitted : 2018-02-24 14:12:09    Popularity:     

Tags: outlet  existing  adding  additional  grounded  

I am chaining a new outlet off an existing one, if I ground the starter box, do I need to ground the new outlet box? Won t the new box be grounded from the starter box with the metal raceway? Any help is appreciated. Thanks

Answers:

Run a ground wire from the existing outlet to the new one. Then the box will be grounded through the chassis of the outlet itself.

I get your point, the raceway should ground the box, it does seem the gradient or inductive difference in the ground would be negligible, but I don't pretend to know more than the code making panel that governs the requirement, and the NEC 250.148 requires all grounds be connected together and to the metal enclosure at every box that contains a termination.

So if you run a ground wire in the raceway you must pigtail it to the box and the outlet, but if you don't run a ground wire then you need only to connect the receptacle to the box.

There are a couple of other scenarios that develop that make little sense, like I once pulled an additional 30A circuit into a 3/4" emt raceway that only had 20A circuits in it. The conduit satisfies the ground requirement, but in my haste I failed to notice that there was an existing (optional) #12 ground wire in the raceway, the electrical inspector wrote a correction notice, I pulled the ground wire out and then it passed.

do NOT trust the metal raceway as a ground. Current electrical code says you should wire in the ground [bare] to the outlet and the box

I'm assuming the wiremold you are referring to is some sort of conduit in this situation. Conduit is no longer considered to the ground alone, hasn't for some time. You are still suppose to run a separate ground, or at least in my state it was required, going on 20 plus years now.

The actual box DOES NOT need to be grounded, but the OUTLET should always be grounded. If this is even REMOTELY news to you, YOU shouldn't be installing outlets.

It depends if the type of raceway is listed for grounding (I believe Wiremold is, but check it; plus the raceway has to be properly connected to the ground). Personally, I'd run a ground wire anyway just to be safe.

Anytime you terminate the Black, White or Red, terminate the ground.



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