erickench
Senior Member
- Location
- Brooklyn, NY
The above NEC section seem's to be a little repetitous. It goes like this:
The common grounding electrode conductor shall be sized in accordance with 250.66, based on the sum of the circular mil area of the largest ungrounded service-entrance conductors.
This is then followed by the statement:
Where the service-entrance conductors connect directly to a service drop or service lateral, the common grounding electrode shall be sized in accordance with Table 250.66, Note 1.
Note 1 of table 250.66 states the following:
Where multiple sets of service entrance conductors are used as permitted in 230.40, Exception No. 2 the equivalent size of the largest service-entrance conductor shall be determined by the largest sum of the areas of the corresponding conductors of each set.
What is the difference between these two conditions except that one case states an installation that is connected directly to a service drop or lateral?
The common grounding electrode conductor shall be sized in accordance with 250.66, based on the sum of the circular mil area of the largest ungrounded service-entrance conductors.
This is then followed by the statement:
Where the service-entrance conductors connect directly to a service drop or service lateral, the common grounding electrode shall be sized in accordance with Table 250.66, Note 1.
Note 1 of table 250.66 states the following:
Where multiple sets of service entrance conductors are used as permitted in 230.40, Exception No. 2 the equivalent size of the largest service-entrance conductor shall be determined by the largest sum of the areas of the corresponding conductors of each set.
What is the difference between these two conditions except that one case states an installation that is connected directly to a service drop or lateral?
