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26301-20
26301-20
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Load Calculations- Branch and Feeder Circuits
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Questions
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Answers
1
The load for 30' of multi-outlet assembly used to supply several loads simultaneously is _____.
1,800VA
900VA
3,600VA
5,400VA
2
The minimum feeder load in VA for small appliance branch circuits required in a residential kitchen?
3,000VA
2,400VA
6,000VA
1,500VA
3
What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temp of 38°C?
41A
44A
50A
45.5A
4
Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device?
90%
100%
80%
75%
5
A noncontinuous load of three 120V outlets for heavy-duty lamp holders would have a load of _____.
1,800VA
3,000VA
1,200VA
2,400VA
6
When space heating equipment uses electric resistance heating elements, protection must NOT exceed _____.
60A
80A
40A
30A
7
The demand load for four pieces of commercial cooking equipment is _____.
90%
70%
65%
80%
8
The length for a 208V 4 wire 3 ph circuit with fixed non cont. loads of 60A @ 45', 40A @ 60', 30A @ 75' & 25A @ 100' is?
85.21'
63.55
71.72'
60.40
9
Total amps for a 120V branch circuit consisting of 4 duplex receptacles rated noncont. duty & 4 continuous duty?
18.5A
17.5A
16.5A
13.5A
10
Air conditioning breakers can never exceed what% of the motor-rated load current or the branch circuit selection current
225%
300%
150%
175%
11
What is the demand factor for three commercial ranges?
80%
90%
70%
100%
12
What is the total load required by the NEC® for four appliance branch circuits plus a laundry branch circuit?
1,500VA
3,000VA
7,500VA
4,500VA
13
What is the MINIMUM ampacity for the branch circuit conductors for a single-phase motor rated at 2hp, 230V?
18A
15A
12A
20A
14
What is the required branch circuit ampacity of a water heater with a nameplate rating of 7,200VA at 240V?
40A
30A
37.5A
42.5A
15
VD for a 120V, single ph. 2-wire branch circuit, 100' long, copper conductors of 6,530 CMs with a non cont. load of 13A?
5.14V
6.24V
4.01V
3.28V
16
Llighting load on a 120V circuit for 6 100W incandescent lights & 4 fluorescent fixtures ballast 1.5A(8 hrs per day)
15.5A
17.60A
13.75A
10.50A
17
Load center length for a circuit with noncont. loads of 125A@ 80', 75A@ 110' , and 50A@100' from the source is _____
78'
59'
93'
87'
18
What is the demand load for one household range with a nameplate rating of 10kW, 240V, 1Ø?
9kW
19kW
8kW
12kW
19
The MAXIMUM size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter D is _____.
60A
100A
80A
120A
20
What is the feeder load (in VA) for four small appliance branch circuits?
2,400VA
6,000VA
1,500VA
1,800VA
21
The total load of show windows must be calculated at NOT less than _____.
300VA per linear foot of show window
100VA per linear foot of show window
200VA per linear foot of show window
150VA per linear foot of show window
22
What is the required circuit ampacity of a noncontinuous, single-phase load of 8.5kW at 277V?
30.69A
28.15A
17.32A
25.25A
23
What is the motor full-load current for an induction type motor with a nameplate rating of 30hp, 40V, 3 phase?
81A
65A
40A
130A
24
A sign load CANNOT exceed _____.
50% of the branch circuit rating
100% of the branch circuit rating
60% of the branch circuit rating
80% of the branch circuit rating
25
For resistance welders, the rating for the overcurrent protection device should NOT exceed _____.
125% of the primary current rating of the welder
200% of the primary current rating of the welder
185% of the primary current rating of the welder
300% of the primary current rating of the welder
