Graphic of the day

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Jpflex

Jpflex

Electrician big leagues
Location
Victorville
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Electrician commercial and residential
Why does today’s daily graphic code show what appears to be a zip tie securing two MC / AC cables within 12 inches of the metal box instead of listed hole straps?

Also I’ve always placed a jumper between the metal box and receptacle ground connector. Is this completely necessary to do for every single metal box, especially when using EMT as a raceway?

The ground wire would be a second EGC, the receptacle can be grounded to the box with screws at non raised portions of the metal faceplate and removing the receptacle wouldn’t disturb the EGC continuous connection because of the EMT.
 

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ptonsparky said:
Zip ties can be used if their label includes language indicating they can be used for support.

If you use an EGC, than it must be bonded to the box and tailed to the receptacle.

IGs are different.
Click to expand...
It doesn't always have to be tailed to the receptacle. If the receptacle is self-grounded, or the cover plate is acceptable for no jumper and surface mounted.
 
ptonsparky said:
Zip ties can be used if their label includes language indicating they can be used for support.

If you use an EGC, than it must be bonded to the box and tailed to the receptacle.

IGs are different.
Click to expand...
Doesn’t the EMT, metal box and metal face plate already do this?
 
As far as the box is concerned the EMT could serve as the equipment ground but if you are going to the trouble & expense if adding a grounding conductor why would you not bond it at the box
 
Jpflex said:
Doesn’t the EMT, metal box and metal face plate already do this?
Click to expand...
I think you are confusing a flush mounted receptacle/metal faceplate with a raised cover mounted receptacle. AKA known as an industrial cover. The raised covers made today can be used with out a jumper to the recep.
Keep in mind that even though EMT cab be used as the EGC to the box, if you so choose to install a wire type EGC in the raceway then it must be connected to the box.
 
texie said:
Keep in mind that even though EMT cab be used as the EGC to the box, if you so choose to install a wire type EGC in the raceway then it must be connected to the box.
Click to expand...
Unless none of its circuit conductors are spliced or terminated in the box.
 
texie said:
I think you are confusing a flush mounted receptacle/metal faceplate with a raised cover mounted receptacle. AKA known as an industrial cover. The raised covers made today can be used with out a jumper to the recep.
Keep in mind that even though EMT cab be used as the EGC to the box, if you so choose to install a wire type EGC in the raceway then it must be connected to the box.
Click to expand...
Now does the jumper have to be connected to each metal box and receptacle in this manner. I have done it in the past this way but my lineman coworker kept saying this was unnecessary at every box.
 
LarryFine said:
Agreed. The thing to remember is that bonding the box is not "optional" while bonding the receptacle is.
Click to expand...
I’m not sure if I get what you mean? The receptacle must be bonded to EGC circuit as well unless you have an isolated ground receptacle where a dedicated EGC is used instead
 
augie47 said:
As far as the box is concerned the EMT could serve as the equipment ground but if you are going to the trouble & expense if adding a grounding conductor why would you not bond it at the box
Click to expand...
I told my boss (not an electrician) that a separate ground wire would not be required for a continuous EMT run but he insisted to run an EGC wire inside the metal raceway anyway.

Therefore, adding pigtails between the receptacles and every single box seemed redundant end excessive work, but I did it anyway as it was the least questionable option in relation to NEC code compliance as I felt.

The drawback of doing this is extra labor time when trying to maximize labor time efficiency which most jobs mandate whether on or off record and relates to your performance speed compared to coworkers
 
Little Bill said:
It doesn't always have to be tailed to the receptacle. If the receptacle is self-grounded, or the cover plate is acceptable for no jumper and surface mounted.
Click to expand...
That’s what I thought but one of my ground books had a list of stipulations for this exemption such as faceplate securing screws not being on a raised portion of the faceplate
 
Jpflex said:
I’m not sure if I get what you mean? The receptacle must be bonded to EGC circuit as well unless you have an isolated ground receptacle where a dedicated EGC is used instead
Click to expand...
I meant by connection of the wire EGC when the receptacle-to-box or cover-to-box contact is permissible.
 
250.146 details the allowances for omitting the bond jumper to the receptacle.
That includes the stipulation mentioned in your post #13
 
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