IEC YEAR 2 FINAL EXAM REVIEW SOLVED
QUESTIONS WITH ACCURATE ANSWERS
◉ The maximum number of 3-pole circuit breakers used as service
disconnects permitted in a 3 phase panelboard is ______.
Answer: 6
◉ Which of the following are characteristics of THHN/THWN
insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant
Answer: all of these
◉ For the purpose of determining the number of current-carrying
conductors in a cable or conduit, the neutral _____ counted when the
branch circuit is 120/240-volt, 1 phase, 3 wire connected to a
120/240-volt, 3 phase delta, 4 wire panelboard. Each of the two
circuits carries 16 amps and serves resistive (linear) loads.
Answer: is not
, ◉ Where a 120/240 volt, 1 phase, 3 wire multiwire branch circuit is
connected to a "split-wired" duplex receptacle in a barber shop, the
branch-circuit OCPD/disconnect is permitted to be ______
i. two single-pole circuit breakers without handle ties
ii. two single-pole circuit breakers with identified handle ties
iii. a 2-pole circuit breaker
Answer: ii or iii only
◉ Which of the following is a type of circuit condition?
i.short circuit
ii. overload
Answer: i and ii
◉ A 20-amp multiwire branch circuit is connected to breakers 1 and
3 in a 120/208 volt 3 phase 4 wire panelboard. _____ if the "hot" from
breaker 3 and the neutral are connected to a 2000-watt lighting
fixture load.
Answer: The load will operate normally and the breaker will not trip
◉ When ____ touch together this is a short circuit.
-i. two ungrounded circuit conductors
- ii.an ungrounded and a grounded circuit conductor
- iii. an ungrounded circuit conductor and the metal conduit.
QUESTIONS WITH ACCURATE ANSWERS
◉ The maximum number of 3-pole circuit breakers used as service
disconnects permitted in a 3 phase panelboard is ______.
Answer: 6
◉ Which of the following are characteristics of THHN/THWN
insulation?
- heat-resistant
- a nylon outer covering or some equivalent
- flame retardant
-moisture-resistant
Answer: all of these
◉ For the purpose of determining the number of current-carrying
conductors in a cable or conduit, the neutral _____ counted when the
branch circuit is 120/240-volt, 1 phase, 3 wire connected to a
120/240-volt, 3 phase delta, 4 wire panelboard. Each of the two
circuits carries 16 amps and serves resistive (linear) loads.
Answer: is not
, ◉ Where a 120/240 volt, 1 phase, 3 wire multiwire branch circuit is
connected to a "split-wired" duplex receptacle in a barber shop, the
branch-circuit OCPD/disconnect is permitted to be ______
i. two single-pole circuit breakers without handle ties
ii. two single-pole circuit breakers with identified handle ties
iii. a 2-pole circuit breaker
Answer: ii or iii only
◉ Which of the following is a type of circuit condition?
i.short circuit
ii. overload
Answer: i and ii
◉ A 20-amp multiwire branch circuit is connected to breakers 1 and
3 in a 120/208 volt 3 phase 4 wire panelboard. _____ if the "hot" from
breaker 3 and the neutral are connected to a 2000-watt lighting
fixture load.
Answer: The load will operate normally and the breaker will not trip
◉ When ____ touch together this is a short circuit.
-i. two ungrounded circuit conductors
- ii.an ungrounded and a grounded circuit conductor
- iii. an ungrounded circuit conductor and the metal conduit.
