FMC fitting suitable for grounding

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buck33k

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Location
Washington state and North Carolina
From the UL online certifications directory:

"Flexible Metal Conduit Fittings ? Flexible metal conduit fittings designed for connection to the conduit by clamping around the circumference of the conduit are considered suitable for grounding for use in circuits over and under 250 V and when used in accordance with the NEC and containing conductors protected by overcurrent devices rated 20 A or less. Flexible metal conduit fittings of types other than the clamping type mentioned previously in the 3/8 through 3/4 in. trade size and containing conductors protected by overcurrent devices rated 20 A or less are considered suitable for grounding when used in accordance with the NEC. All other trade sizes that have been investigated for grounding are marked "GRND" or the equivalent."

Is this saying that 3/8" thru 3/4" screw-in type fmc fittings(jakes) are not suitable for grounding above 250v ? Assuming circuit 20 a. or less.

250.118(5)a got me thinking about this.
 
buck33k said:
Is this saying that 3/8" thru 3/4" screw-in type fmc fittings(jakes) are not suitable for grounding above 250v ? Assuming circuit 20 a. or less.
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Hmmm... I know that the screw-in type FMC connectors are used for grounding in approved UL listed assemblies. I wonder if they're simply covered in a different part of the UL White Book?
 
I have never seen or installed a jake fitting. We always use the compression type around here.

However, they seem to use them all over the place in AZ, CA etc....
 
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