Lengths of flexible metal conduit longer than 6 feet are not acceptable as an equipment grounding conductor. In such cases a separate bonding jumper is required to be run outside of the flexible conduit to maintain the continuity of the grounding path.
Because of its spiral design, flexible metal conduit (FMC) can slither through walls and other structures. Buildings with commercial and industrial uses have electrical wiring that is protected by FMC. A special kind of flexible metal conduit (FMC) with a plastic coating is called a liquid-tight flexible metal conduit (LFMC). It can be made watertight by using sealed fittings.
Products comply with Underwriters Laboratories (UL) and CSA Standard UL 360/CSA C22.2 No. 56-17 Flexible Metal Conduit and Liquid-Tight Flexible Metal Conduit and all types of FMC and LFMC identified in the National Electrical Code® (NEC).
The creation of installation and application guidelines for FMC is promoted by NEMA Members, and they were successful in proposing to UL a sample choice for the qualification testing of LFMC jacketing materials.
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