Metallic or non-metallic flex?I have a 2" emt run with a piece of flex in the middle to allow for expansion. Do I need to run a bounding jumper around the flex if I have a EGC installed in the conduit? I can't find a code reference
The raceway is already bonded at both ends, if the FMC were PVC would it still require a bonding jumper? So the same 2" FMC feeding a transformer with an internal EGC requires an external bonding jumper?In my opinion, even though you have a conductor type grounding conductor, the conduit system is a 250.118 equipmetn ground and jumperrs would need to be installed other than as mentioned by kwired (20 amp circuits)
True! I guess if all we are doing is assuring the raceway (conduit) is bonded, no jumper would be needed but IF we wanted to assure the reaceway as a grounding means, albeit, redundant, then a jumper would be needed.The raceway is already bonded at both ends, if the FMC were PVC would it still require a bonding jumper? So the same 2" FMC feeding a transformer with an internal EGC requires an external bonding jumper?
metalMetallic or non-metallic flex?
I see what you are saying but since the pipe is not being used as the egc than I'm saying you don't need them. I just can't locate a reference. My AHJ agreed with me as wellIn my opinion, even though you have a conductor type grounding conductor, the conduit system is a 250.118 equipmetn ground and jumperrs would need to be installed other than as mentioned by kwired (20 amp circuits)
yes this is for a 200a feeder. I didn't find anything referencing ocpdI believe largest overcurrent device protecting the conductors within can be a factor also.
With 2 inch this probably enclosing a feeder or larger branch circuit, but if it contains no more than 20 amp max circuits, then it may not need any bonding jumper.
That's correct. If you use 2" FMC between two junction boxes with an EGC within the FMC you do not also need an external bonding jumper. Same logic applies to the OP.I see what you are saying but since the pipe is not being used as the egc than I'm saying you don't need them. I just can't locate a reference. My AHJ agreed with me as well
250.118 covers pretty much everything we talking about here.yes this is for a 200a feeder. I didn't find anything referencing ocpd
517.13(A) says the wiring method itself shall qualify as a EGC in accordance with 250.118. If OCPD is over 20 amps FMC doesn't qualify, you can't use FMC for this particular instance at all.True! I guess if all we are doing is assuring the raceway (conduit) is bonded, no jumper would be needed but IF we wanted to assure the reaceway as a grounding means, albeit, redundant, then a jumper would be needed.
Muddy the water... what if it was a 30 amp branch circuit in a patient care area ??