Bonding of LFMC on a 20A Circuit

[d2568maaee]

If installed "Listed" liquidtight flexible metal conduit (LFMC (Art. 350)) complies with the following requirements [250.118(6)(a)-(e)] I understand that NEC will allow the LFMC to be used as an Equipment Grounding (Bonding) Conductor:

(1) The conduit terminates in fittings listed for grounding.
(2) For trade sizes ⅜ inch through ? inch, the circuit conductors are protected by overcurrent devices rated 20A or less.
(3) For trade sizes ? inch through 1? inch, the circuit conductors are protected by overcurrent devices rated 60A or less.
(4) The combined length of the conduit in the same ground return path doesn't exceed 6 feet.
(5) The application requires flexibility.


Question: If the length of LFMC exceeds 6 feet, and a correctly sized EGC is installed through the LFMC, and correctly terminated at each end in a junction box, and the installation complies with 1-5 above, is an external bonding jumper required on the outside of the LFMC?

 

[jumper]

Nope.

 

[d2568maaee]

Thanks Jumper. I appreciate the quick response.

 

[kwired]

If installed "Listed" liquidtight flexible metal conduit (LFMC (Art. 350)) complies with the following requirements [250.118(6)(a)-(e)] I understand that NEC will allow the LFMC to be used as an Equipment Grounding (Bonding) Conductor:

(1) The conduit terminates in fittings listed for grounding.
(2) For trade sizes ⅜ inch through ? inch, the circuit conductors are protected by overcurrent devices rated 20A or less.
(3) For trade sizes ? inch through 1? inch, the circuit conductors are protected by overcurrent devices rated 60A or less.
(4) The combined length of the conduit in the same ground return path doesn't exceed 6 feet.
(5) The application requires flexibility.


Question: If the length of LFMC exceeds 6 feet, and a correctly sized EGC is installed through the LFMC, and correctly terminated at each end in a junction box, and the installation complies with 1-5 above, is an external bonding jumper required on the outside of the LFMC?

Your mentioned condition 5 is not correct. If the application requires flexibility you must install an equipment grounding conductor and not use the raceway as the sole EGC no matter what other conditions are.

 

[PEDRO ESCOVILLA]

if it exceeds six feet in length, it doesn't comply with condition #4 above. see what happens when you spend all your spare time reading code books!:lol:

 

[infinity]

If it's over 6' the EGC must be on the inside. {250.102(E)}