Question 1 of 10
What is the primary purpose of NEC Article 250?
Article 250 is dedicated to safety, focusing on preventing shock and ensuring the electrical system functions correctly.
Question 2 of 10
What is the primary purpose of grounding?
Grounding is designed to protect against overvoltages from external sources like lightning.
Question 3 of 10
What is the primary purpose of bonding?
Bonding ensures a low-resistance path for fault current to return to the source, enabling rapid breaker tripping.
Question 4 of 10
Which of the following can be used as a grounding electrode?
Metal water pipes are commonly used as grounding electrodes.
Question 5 of 10
What happens if a hot wire touches a metal enclosure that is not properly bonded?
Without proper bonding, the metal case remains energized, creating a shock hazard.
Question 6 of 10
Which table in the NEC is used to size the Equipment Grounding Conductor (EGC) inside a cable?
Table 250.122 provides the EGC sizing based on the overcurrent protection device's rating.
Question 7 of 10
What is the purpose of bonding the metallic sheath of a cable to the EGC?
Bonding the sheath to the EGC eliminates potential voltage differences that could cause a shock.
Question 8 of 10
What type of protection device is designed to protect equipment from burnouts?
GFPE (Ground Fault Protection of Equipment) is specifically designed to protect equipment.
Question 9 of 10
Where are GFCIs (Ground Fault Circuit Interrupters) typically required?
GFCIs are mandated in specific locations to protect people from shock hazards.
Question 10 of 10
What is the main concern when bonding metal cable trays?
Bonding metal cable trays creates a continuous path to ground, ensuring that a fault causes the breaker to trip.
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