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Self grounding receptacles - when is it safes to rely on flange to metal box

Self grounding receptacles - when is it safes to rely on flange to metal box


  #1  
Old 10-18-13, 05:05 PM
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Self grounding receptacles - when is it safes to rely on flange to metal box

I am in Chicago burbs where metal conduits are used (no ground wire).

I need some guidance on when I can relay on a flange of the receptacle to ground and when not. Sometimes I see the term self-grounding for receptacles. In this case there is usually a copper spring type part mounted to the flange of the receptacle; e.g.
http://www.cesco.com/resources/07847...ctImageURL.jpg

I need to wire a Leviton 5280 surge protector that looks like this:
http://www.gordonelectricsupply.com/...5_PE_001_E.jpg

It doesn't have the copper "spring" like the one above. Is the flange to screw to metal box an allowable grounding?
Or do I have to use the ground screw and install a wire to the metal box?
 
  #2  
Old 10-18-13, 06:06 PM
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Is the flange to screw to metal box an allowable grounding?
What you're calling a flange is one end of the mounting yoke for the device. When that's connected to a metal part of a grounded system, the device is connected to ground.
Or do I have to use the ground screw and install a wire to the metal box?
You don't have to, but I never do it any other way. Unless you use a ground screw and a length of conductor, the device isn't bonded to ground. It only has that important safety path available when it is fully mounted.
 
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Old 10-18-13, 07:20 PM
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I need to wire a Leviton 5280 surge protector that looks like this:
It isn't self grounding and must be attached to the grounded box by a grounding pigtail.
 
 

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