Grounding and Bonding Flashcards
6 cards from real 309A practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Grounding and Bonding flashcards as text
What is the purpose of a ground fault circuit interrupter (GFCI)?
Answer: To detect current imbalance between hot and neutral and trip at approximately 5 mA to prevent electric shock
A GFCI monitors the current balance between the hot and neutral conductors. If it detects a difference of approximately 5 mA (indicating current leaking to ground through a person or fault), it trips within milliseconds.
According to the CEC, where must GFCI protection be provided in a dwelling unit?
Answer: Bathrooms, kitchens, outdoors, garages, unfinished basements, and within 1.5 m of sinks
The CEC requires GFCI protection in multiple locations where moisture increases shock risk: bathrooms, kitchen counters, outdoors, garages, unfinished basements, laundry areas, and near sinks.
What is the role of the bonding conductor in a metal raceway system?
Answer: To provide an effective fault current path to ensure overcurrent devices operate during a ground fault
The bonding conductor ensures that all metallic components of the raceway system are electrically continuous, providing a low-impedance path for fault current that enables the overcurrent device to trip quickly.
What is the CEC requirement for bonding CSST (corrugated stainless steel tubing) gas piping?
Answer: Bond with minimum No. 6 AWG copper to the grounding electrode system
CEC and CSA B149.1 require CSST gas piping to be bonded with a minimum No. 6 AWG copper conductor to the electrical grounding system to prevent lightning-induced damage to the thin-walled tubing.
What is the function of an isolated grounding receptacle?
Answer: It provides a dedicated grounding path separate from the building's general equipment grounding to reduce electrical noise
Isolated grounding receptacles have a separate, dedicated grounding conductor that runs directly back to the panel, bypassing the building's general equipment grounding system to reduce electromagnetic interference for sensitive equipment.
What colour is the conductor insulation for an isolated grounding conductor?
Answer: Green with yellow stripe
An isolated grounding conductor is identified by green insulation with a yellow stripe, distinguishing it from the standard green equipment grounding conductor in the same installation.