CDL Hazardous Materials Endorsement (HME)Loading and Unloading Hazardous MaterialsEasy
A driver is preparing to load a cargo tank with a hazardous material that requires bonding and grounding. What is the primary purpose of connecting a bonding cable between the cargo tank and the facility's loading arm?
- ATo monitor the temperature of the hazardous material during loading.
- BTo prevent overfilling of the cargo tank.
- CTo equalize electrical potential and prevent static electricity discharge.
- DTo provide a secure physical connection between the tank and the loading arm.
Show answer & explanationAnswer & explanation
Correct answer: C. To equalize electrical potential and prevent static electricity discharge.
Bonding is critical during the transfer of flammable liquids to prevent the buildup of static electricity, which can generate a spark capable of igniting vapors. The bonding cable ensures that both the cargo tank and the loading facility have the same electrical potential, thereby eliminating the risk of a static discharge.
Why the other options are wrong
- A. Temperature monitoring is done with thermometers or sensors, not through the bonding cable.
- B. Overfill prevention is typically handled by separate sensors and control systems, not the bonding cable.
- D. While it is a connection, its primary purpose is electrical, not mechanical securement.
Bonding (HazMat Loading)
Connecting two or more conductive objects with a conductor to equalize their electrical potential, primarily to prevent static electricity discharge during hazardous material transfer.
- Prevents static electricity buildup.
- Essential when transferring flammable liquids.
- Aids in safety to prevent ignition of vapors.
Memory trick: Bonding links, charges shrink, no spark, safe tank.