Please bear with me. I am seeking knowledge and interpretations.
Based upon 2008 NEC
I need help clarifying in my mind what is considered service wiring. The definition (Article 100) for service states "The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served."
Section 230.2 states that a building or other structurecan only have one service unless otherwise permitted.
Section 230.2(A) lists some of those conditions that are "otherwise permitted" - fire pumps, emergency, legally required, and/or optional standby systems, parallel power productions systems, etc.
Section 705.2 specifically lists photovoltaic and wind systems asexamples of a hybrid system that is covered under Article 705 (Interconnected Electric Power Production Sources). In my mind this makes each of them (solar, wind) a parallel power production system.
This questionwas on my most recent exam:
Which of the following statements aboutservice wiring is true?
a. The wiring from an optional standby generator is considered service wiring.
b. The wiring from a solar photovoltaic system is considered service wiring.
c. The wiring from a wind generator is considered service wiring.
d. The wiring from a serving utility is considered service wiring.
The correct answer on the test, with its explanation?
Answer: d. Service wiring is delivered to the premise by the serving utility.
I challenged the answer, my position being: Given my explanations above, all of theanswers are considered an additional service per 230.2(A) and therefore all were considered service wiring.
The response I was given was “According to thedefinition of service, only a utility can supply a service.”
There is no Article 100 definition for “utility”, so I am mystified.
What am I missing here?
Thanks in advance for your help. I am heading into the field and will not be able to check on the responses for 7-8 hours.