Raised Cover Receptacles and Switches

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Smart $ said:
That's odd. The ones I used to use always came with three short screws and two star-washer nuts in a bag for each receptacle.
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The various manufacturers have their differences.

I can't ever remember having more than the two nutted 6-32 round-head machine-bolts included with the predrilled duplex receptacle raised covers. The most common nuts, that my material provide, have been either nylon locking or Keps (saw like teeth cut into the nut faces).

The oval head 6-32s only come with raised covers made for switches and single receptacles, in my experience with the material.
 
kwired said:
I have mostly used RACO or Appleton for past 20-25 years, they always had two screws and two nuts in the package as a general rule, any more or less, which didn't happen all that much, was probably a malfunction on the packaging line.
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I haven't used any other than what they sell at Lowe's in 20 years. Used to order them by the case. Can't remember the make I used.
 
The duplex raised covers usually have 3 screws and 2 nuts.

It's actually the Decora raised cover for a GFI that has the most screws oddly enough.

The Appleton 8362 I have has a hodge podge of screws and nuts in the bag.

Oh well, pretty boring post other than Smart telling me I needed to go RTFM.

JAP>
 
jap said:
If your running MC cable, It's no different than running EMT. The EGC in the MC still has to bond to the box, and, if the same scenario as we've been discussing you still wouldn't have to put a jumper from the box to the receptacle since the metallic jacket on MC is also and allowed EGC as long as installed properly.

JAP>
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Proper connectors and proper installation are a must but I'm not sure the metal jacket on MC is considered an effective EGC. Granted, the metal casing is effectively grounded on both ends of the cable run but does it provide an effective ground path in the event of a fault ? Now, in the case of AC cable there is a bare shunt wire wrapped inside the jacket which is part of the grounding system of that cable whereas MC has no shunt wire. I'm guessing that's why they included the green wire in the make up of MC cable. If I'm mistaken on this please state why.
 
goldstar said:
Proper connectors and proper installation are a must but I'm not sure the metal jacket on MC is considered an effective EGC. Granted, the metal casing is effectively grounded on both ends of the cable run but does it provide an effective ground path in the event of a fault ? Now, in the case of AC cable there is a bare shunt wire wrapped inside the jacket which is part of the grounding system of that cable whereas MC has no shunt wire. I'm guessing that's why they included the green wire in the make up of MC cable. If I'm mistaken on this please state why.
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The newer MC-ap uses the jacket in concert with the bare #10 Al conductor as the EGC and has no green conductor within the cable assembly.
 
infinity said:
The newer MC-ap uses the jacket in concert with the bare #10 Al conductor as the EGC and has no green conductor within the cable assembly.
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Haven't had an occasion to use that yet. How about the std. MC jacket ? Is that an effective ground path ?
 
goldstar said:
Haven't had an occasion to use that yet. How about the std. MC jacket ? Is that an effective ground path ?
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As you've stated, no, only the green conductor qualifies an EGC with the standard MC cable. Unless the spec requires MC with an insulated green conductor MC-ap is the way to go. :)
 
Thanks. BTW, I want to correct something I stated in my original response - MC cable jacket is only properly connected to a ground at the source (or breaker panel) and not at both ends.
 
goldstar said:
Thanks. BTW, I want to correct something I stated in my original response - MC cable jacket is only properly connected to a ground at the source (or breaker panel) and not at both ends.
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Correction. Grounding one end of the armor is the minimum required in many peoples mind. IMO proper connection requires continuity to ground on both ends, regardless of not having EGC status.
 
Well, regular MC jacket is like a run of conduit with a green ground conductor run with the other conductors. You use the green ground to bond the boxes and devices. The conduit itself gets "grounded" at every box it connects to but it isn't part of the grounding system.

-Hal
 
hbiss said:
Well, regular MC jacket is like a run of conduit with a green ground conductor run with the other conductors. You use the green ground to bond the boxes and devices. The conduit itself gets "grounded" at every box it connects to but it isn't part of the grounding system.

-Hal
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...is...

Solid metal conduit qualifies as an EGC regardless of running a wire-type EGC.

MC armor is part of the grounding system... just not the circuit EGC part.
 
Smart $ said:
...is...

Solid metal conduit qualifies as an EGC regardless of running a wire-type EGC.

MC armor is part of the grounding system... just not the circuit EGC part.
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That's what I meant to say only you said it better than I did.:thumbsup:
.
 
hbiss said:
Well, regular MC jacket is like a run of conduit with a green ground conductor run with the other conductors. You use the green ground to bond the boxes and devices. The conduit itself gets "grounded" at every box it connects to but it isn't part of the grounding system.

-Hal
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250.96 A seems to allow the cable sheath for an EGC.
250.97 A seems to allow the cable sheath for an EGC for circuits over 250volts.

What am I missing?

JAP>
 
jap said:
250.96 A seems to allow the cable sheath for an EGC.
250.97 A seems to allow the cable sheath for an EGC for circuits over 250volts.

What am I missing?

JAP>
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The jacket/sheath has to be a listed EGC. Regular MC with the green conductor inside is not listed as such.
 
Unbridled said:
If properly listed, why not terminate EGC directly to device? Box and Cover will be bonded per 250.146?
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If I'm understanding your scenario correctly it doesn't seem like it would comply with 250.148(B).

250.148(B) Grounding Continuity. The arrangement of groundingconnections shall be such that the disconnection or theremoval of a receptacle, luminaire, or other device fed fromthe box does not interfere with or interrupt the groundingcontinuity.
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infinity said:
The jacket/sheath has to be a listed EGC. Regular MC with the green conductor inside is not listed as such.
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The part where it says the sheath has to be "listed" is what I'm missing.

Where is that sentence located?

JAP>
 
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