Question 1 of 10
What is the primary function of a 3-pole circuit breaker?
A 3-pole breaker protects and disconnects all three hot conductors simultaneously in a 3-phase circuit.
Question 2 of 10
In a 120/208V high-leg delta system, which phase is typically the 'high leg'?
In a high-leg delta system, L2 (B-phase) is the high leg, carrying a higher voltage to neutral (typically around 208V).
Question 3 of 10
What is the typical voltage between the high leg and neutral in a high-leg delta system?
The voltage between the high leg (L2) and neutral in a high-leg delta system is typically 208V.
Question 4 of 10
What color is the high leg required to be in a high-leg delta system, according to NEC?
The high leg must be orange, as per NEC 110.15 and 408.3(E).
Question 5 of 10
Which loads are typically supplied by 3-pole breakers?
3-pole breakers are designed for three-phase loads, like motors and heavy industrial equipment.
Question 6 of 10
What is the voltage rating that a 3-pole breaker may operate and protect?
A 3-pole breaker is designed to work across multiple voltage ratings.
Question 7 of 10
Where should the equipment grounding conductor (EGC) be connected?
The EGC should be connected to the panel ground bus for proper grounding.
Question 8 of 10
What would be the effect on a circuit, if a fault occurs on a single phase wire, protected by a 3-pole breaker?
A fault on a single phase will cause the 3-pole breaker to disconnect all three phases.
Question 9 of 10
Which NEMA receptacle is referenced for the 3-phase outlet?
NEMA 15-60 receptacle is referenced for the 3-phase outlet
Question 10 of 10
What is the main function of the 'Line Side' terminals of a 3-pole breaker?
The line side terminals connect to the incoming three-phase supply.
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