HOLT Electricians Practice Exam

Can single pole breakers with approved handle ties be used for circuit disconnects for gasoline dispensing equipment?

1. Yes

2. No

3. Only under specific conditions

4. Only in Class III locations

The correct answer is: No

Using single pole breakers with approved handle ties as circuit disconnects for gasoline dispensing equipment is not allowed due to safety and regulatory concerns. The National Electrical Code (NEC) has specific requirements regarding disconnecting means for equipment in hazardous locations, such as those where flammable liquids like gasoline are present. Gasoline dispensing equipment must be equipped with a disconnect means that ensures the safe shutdown of power, and it is essential that the disconnect switch fully interrupts the circuit. Single pole breakers may not provide the reliable disconnection needed for safety in these environments because they only interrupt one phase of a three-phase system, leaving potential phases energized, which can lead to hazardous situations. Opting for a proper disconnect that meets the regulations ensures that the entire circuit can be fully de-energized. This is crucial in ensuring the safety of personnel and preventing accidents during maintenance or emergencies. By adhering to these standards, compliance with safety protocols is maintained, which is vital in environments dealing with flammable materials.