How long can flexible metal conduit enclosing secondary circuit conductors from a neon transformer be to bond metal parts of a sign?

The correct response of 100 feet pertains to the maximum length of flexible metal conduit (FMC) that can be used to bond metal parts of a sign when enclosing secondary circuit conductors from a neon transformer. This regulation is established to ensure effective grounding and bonding, which are critical for safety and to minimize the risk of electrical shock or fire hazards.

When using flexible metal conduit, it is important to ensure that the distance does not exceed the specified limit to maintain adequate electrical continuity. Beyond this length, the resistance may increase, potentially leading to insufficient bonding between the conduit and the metal parts of the sign. Therefore, the 100-foot limit is not only a guideline but a necessary requirement for maintaining safe electrical practices and operations under standard codes.

Understanding this limit helps professionals in the field design and implement electrical systems that conform to safety standards while ensuring that metal structures are properly bonded to mitigate risks associated with neon transformer operations.