250.146

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surf more

surf more

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eastern NC
if device is correctly fasten properly with flat edge-thread screw---no bonding jumper..........i get that but i guess you would still need the box grounded unless you used compress couplings?????????
 
surf more said:
if device is correctly fasten properly with flat edge-thread screw---no bonding jumper..........i get that but i guess you would still need the box grounded unless you used compress couplings?????????
Click to expand...

compress couplings???

Do you mean compression couplings on EMT?

EMT is a listed grounding conductor (250.118) It makes no mention of either setscrew or compression fittings.
 
Huh? Metal boxes need to be grounded. The conduit system can be the grounding means or a conductor or both.
If the conductor is present, you need to follow 250.148.
 
yes- surface mounted box.i do see 250-118, but wow of all the codes emt with set screw couplings can serve as a legal ---new install--- as a effective grounding conductor...so you would not even need a grounding conductor wire present at a device box?????????
 
surf more said:
yes- surface mounted box.i do see 250-118, but wow of all the codes emt with set screw couplings can serve as a legal ---new install--- as a effective grounding conductor...so you would not even need a grounding conductor wire present at a device box?????????
Click to expand...

Bob?......
 
surf more said:
if device is correctly fasten properly with flat edge-thread screw---no bonding jumper..........i get that but i guess you would still need the box grounded unless you used compress couplings?????????
Click to expand...


A metal box is required to be grounded. This can be accomplished by the metallic raceway connected to it. The receptacle is permitted to be bonded to a surface metal box if one of the plastic washers that holds the 6-32 screws in place is removed or if a self grounding receptacle is installed.
 
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