What is the minimum size equipment bonding jumper required from a grounding terminal on a switch for a neon tubing circuit protected at 30 amperes?

The minimum size equipment bonding jumper required from a grounding terminal on a switch for a neon tubing circuit protected at 30 amperes is determined by the relevant electrical codes, specifically those concerning conductors used for equipment bonding. The correct answer indicates that for a circuit protected at 30 amperes, a 10 AWG copper jumper is appropriate because it meets the requirements for bonding conductors with current-carrying capacities defined in the National Electrical Code (NEC).

In general, bonding jumpers must be sized based on the circuit's ampacity and possible fault currents to ensure safety and reliability. A 10 AWG copper jumper provides an optimal balance of conductivity and physical durability, ensuring that the bonding connection is sufficient to handle the potential fault currents without overheating.

The other options—8 AWG, 12 AWG, and 14 AWG—do not meet the necessary criteria for bonding adequacy for a circuit protected at this level. An 8 AWG may provide more capacity than required, while 12 AWG and 14 AWG would be insufficient for proper safety and code compliance in this context, potentially jeopardizing the effectiveness of the grounding system. Thus, the choice of 10 AWG copper aligns with both safety standards and practical