LFMC bonding - 250.118

D

Dale001289

Senior Member
Location
Georgia
Does a six foot long 3/4” LFMC require an external bonding jumper? Or is the internal metallic core along with EGC sufficient?


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infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Look here:
250.118(5)Listed flexible metal conduit meeting all the following conditions:
a. The conduit is terminated in listed fittings.
b. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
c. The size of the conduit does not exceed metric designator 35 (trade size 11∕ 4).
d. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
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E

Eddie702

Licensed Electrician
Location
Western Massachusetts
Occupation
Electrician
As the Op has an equipment grounding conductor installed I don't believe he is limited to 20amps or the other conditions shown above.

Don't those condition only apply if you are using the LFMC as an equipment ground without an external bonding jumper or an internal equipment ground?
 
infinity

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
Eddie702 said:
As the Op has an equipment grounding conductor installed I don't believe he is limited to 20amps or the other conditions shown above.

Don't those condition only apply if you are using the LFMC as an equipment ground without an external bonding jumper or an internal equipment ground?
Click to expand...
You're correct, I misread the question. Since there is an EGC there is no limit as to the length of the LFMC, the circuit size, or a requirement to install a bonding jumper.
 
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