What is the maximum length of flexible metal conduit permitted as a bonding means for conductive parts associated with a neon sign secondary circuit?

The maximum length of flexible metal conduit that can be used as a bonding means for conductive parts associated with a neon sign secondary circuit is specified as 100 feet. This length is established to ensure proper grounding and bonding effectiveness while also allowing sufficient flexibility for installation and maintenance. Maintaining an appropriate conduit length is crucial for ensuring that the bonding system can effectively dissipate any fault currents, thereby enhancing overall safety and reducing the risk of electrical hazards. Using conduit beyond this specified length might not provide adequate bonding due to potential increases in impedance, which could lead to insufficient grounding effectiveness.