In an electrical distribution system, what is the main purpose of bonding metal raceways and equipment enclosures?
Correct Answer
B) To establish an effective path for fault current
Bonding connects normally non-current-carrying metal parts so fault current has an effective path back to the source. Other choices confuse bonding with lighting control, voltage transformation, or circuit protection devices.
Why This Is the Correct Answer
Bonding connects normally non-current-carrying metal parts so fault current has an effective path back to the source. Other choices confuse bonding with lighting control, voltage transformation, or circuit protection devices.
Why the Other Options Are Wrong
Option A: Use bonding to reduce lighting fixture brightness
Bonding metal raceways does not control lamp output; lighting brightness is handled by fixture/driver/control design.
Option C: Use bonding to increase transformer voltage
Transformer voltage is changed by transformer design and taps, not by bonding raceways and enclosures.
Option D: Use bonding to replace all overcurrent devices
Bonding helps fault current return to the source, but overcurrent devices are still required to interrupt the fault.
Memory Technique
Make bonding a purpose cue; if the choice changes the purpose, it cannot be To establish an effective path for fault current.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use by topic index - grounding / bonding / GFCI / coordination to confirm that Bonding connects normally non-current-carrying metal parts so fault current has an effective path back to the source.
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