Question 1 of 15
What NEC article defines service-entrance conductors?
NEC 100 defines the terms used in the NEC, including service-entrance conductors.
Question 2 of 15
According to NEC, what is the ampacity of service-entrance conductors based on?
NEC 230.42 states that the ampacity of service-entrance conductors must be no less than the rating of the service disconnect.
Question 3 of 15
What is the minimum rating of a main service disconnecting means for a residential one-family dwelling, according to the article?
The article states that the rating of minimum-size main service disconnecting means for a residential one family dwelling is 100-amp (3-wires) – 230.79(C).
Question 4 of 15
What NEC article covers the ampacity requirements for service-entrance conductors?
NEC 230.42 specifies the ampacity requirements for service-entrance conductors.
Question 5 of 15
What is the purpose of service-entrance conductors?
Service-entrance conductors run between the utility transformer and the main service equipment.
Question 6 of 15
Which of the following determines the size of the service conductors?
The size of the service conductors is determined by the minimum ampacity requirement and factors like voltage drop, temperature rating, and conductor material.
Question 7 of 15
Which NEC table is referenced for determining the minimum size of service conductors?
NEC 310.12 and Table 310.12(A) are used for determining the minimum size of service conductors.
Question 8 of 15
What is the required size of copper service-entrance conductors for a 100A service?
According to the article's table, a 100A service requires #4 AWG copper conductors.
Question 9 of 15
What is the required size of aluminum service-entrance conductors for a 125A service?
Based on the article's table, a 125A service requires #1/0 AWG aluminum conductors.
Question 10 of 15
What determines the size of the equipment grounding conductor (EGC) and the grounding electrode conductor (GEC)?
For service conductors, follow NEC 250.24(A) and table 250.66 for grounding electrode conductor sizing, which is also used for EGC sizing based on overcurrent protection.
Question 11 of 15
What is the typical voltage supplied to a dwelling unit mentioned in the article?
The article uses examples based on 120/240V main panels.
Question 12 of 15
What is the required copper wire size for a 150-amp service, according to the example?
The example indicates #1 AWG copper is required for a 150-amp service.
Question 13 of 15
What size aluminum service-entrance conductors are required for a 200A service?
Based on the table, a 200A service requires #4/0 AWG aluminum conductors.
Question 14 of 15
What type of service conductors run from the utility pole to the main panel?
The article explicitly defines service-entrance conductors as running from the utility transformer to the main panel.
Question 15 of 15
What is the main factor in determining the ampacity of service conductors?
The article mentions that service conductors must be sized based on the calculated load.
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