TN LLE Overcurrent Protection 3

Question 1

Per NEC 230.90(A), what is the maximum rating of the service overcurrent device relative to the conductor ampacity?

Accepted Answer

Must not exceed the allowable ampacity of the service-entrance conductors

Answer

Must be equal to conductor ampacity

Answer

Can be up to 125% of conductor ampacity

Answer

Can be any standard size above the conductor ampacity

Question 2

What is the purpose of ground-fault protection of equipment (GFPE) per NEC 230.95?

Accepted Answer

To detect ground faults and disconnect the service to prevent equipment damage and fire on solidly grounded wye services of more than 150V to ground and 1000A or more

Answer

To protect people from shock

Answer

To protect against lightning strikes

Answer

To detect short circuits between phases

Question 3

Per NEC 240.83(D), what marking is required on circuit breakers used to switch 120V or 277V fluorescent lighting?

Accepted Answer

SWD (Switching Duty)

Answer

UL listed

Answer

CSA certified

Answer

HACR rated

Question 4

What is the NEC requirement for coordination between overcurrent devices in a series (selective coordination)?

Accepted Answer

Coordination is required for certain critical systems like emergency, legally required standby, and healthcare systems

Answer

No coordination is required

Answer

All systems must be coordinated

Answer

Only services over 400A require coordination

Question 5

Per NEC 240.86, what is the maximum distance for a series-rated system where the line-side device protects load-side devices?

Accepted Answer

No distance limit as long as the combination is tested and listed

Answer

The combination must be in the same panel

Answer

100 feet maximum

Answer

25 feet maximum

Question 6

What type of overcurrent protection is required for flexible cords and fixture wires per NEC 240.5?

Accepted Answer

Overcurrent protection based on NEC Table 400.5(A)(1) cord ampacity values

Answer

No overcurrent protection needed

Answer

The same as building wire — based on Table 310.16

Answer

A maximum of 15 amperes for all cord types