eccodes a leader in education electricians. eccodes a leader in education today's presentation...
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ECCODESA Leader in Education
Electricians
ECCODESA Leader in Education
Today's presentation does not include voltage drops, power factor, increase use of electricity, and is intended ONLY to be used as a study-aide and not to design or to be used to validate an installation.
ECCODESA Leader in Education
Electricians
Study-aide
Always consult with the local AHJ in your area for an interpretation.
ECCODESA Leader in Education
Study-aide
Questions
ECCODESA Leader in Education
Question:
a. 22,500 va. b. 12.500 va.
c. 6,250 va. d. 16,250 va.
A J. C. Penny (store) is to have 125- 20-ampere, 125-volt multiple general use receptacles installed , in various locations throughout its store. What is the DEMAND receptacle load for this installation?
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Article 220
Receptacles installed, in other than dwellings, must be calculated at 180.va per receptacle on the same yoke as provided in 220.14(I) and permitted to apply the demand in 220.44. [See 220.14(I) and exception for four or more receptacles used for a specific equipment.]
EXAMPLE: 180va. X 125 = 22,500va. The first 10kw@100% remained @50%.
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Question:
a. 8
b. 9.6
c. 6.4
d. 10
The feeder demand load for an 8 kW load, increased by 20% is kVA.
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Article 220
EXAMPLE: 8,000 watt range is the demand load in column C of table 220.55
Therefore, 8,000 watts x .2 [increased 20%] = 1600watts added to 8,000 watts.
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Question:
a. # 8b # 6.c. # 4 d. # 2
What size THHN conductor is required to terminate to a 70-ampere circuit breaker or fuse?
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Article 110/310
In the question there is no mention of the temperature ratings of the equipment, such as at the breaker, therefore, looking at 110.14(C) we must use the 60 L column in table 310.15(B)(16).
Also there is no mention if the load is a continuous load, therefore, it would be considered as non-continuous and calculated @ 100%.
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