When a service enters a building and a service disconnect is not provided immediately at the entrance, do the service conductors need to be concrete encased inside an electrical room when they travel a distance (10', 15', etc.) to a C/T cabinet w/ service switch? This is in NYC.
When a service enters a building, when is concrete encasement required?
- Thread starter cppoly
- Start date
Boingo1972
Member
- Location
- South Carolina
- Occupation
- Engineer for cable company
Emergency or non-emergency feeds? AKA doesit requrie a 2 hour rating or not per Article 700? I can help if emergency.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Service conductors must remain "outside the building" until they are "close enough" to the service disconnect. In WA state, the limit is 15 feet. If the conductors enter the building within the electrical room, and the disconnect is more than that distance from the point of entry, then yes, they must be within 2 inches of concrete.
I don't know about New York (state or city).
I don't know about New York (state or city).
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
Probably not but it depends on a few factors such as it be practicable and with the approval from the building department. The 10-4" EMT's from the ConEd end box above are 480 volt service entrance conductors and they're about 25' long.
NEC Inspector
Senior Member
- Location
- Kansas
- Occupation
- Inspector
230.70(A)(1) is the disconnect location, which requires the disconnect to either outside or "inside nearest the point of entrance of the service conductors".
Section 230.6 is where you get the concrete encasement to keep the service conductors "outside" of the building to keep the "point of entrance" closer to your disconnect where necessary.
Section 230.6 is where you get the concrete encasement to keep the service conductors "outside" of the building to keep the "point of entrance" closer to your disconnect where necessary.
Last edited:
- Location
- New Jersey
- Occupation
- Journeyman Electrician (retired)
I don't think that there is a written NYC exemption it just comes down to what the installation would allow and whst you can get approved based on the design layout of the equipment. We've used concrete encasement for service conductors that ran 100' into the building.
Strathead
Senior Member
- Location
- Ocala, Florida, USA
- Occupation
- Electrician/Estimator/Project Manager/Superintendent
I am a little surprised this is allowed. In my county, nearest the point of entrance is straight to the main disconnect lugs, even an LB is forbidden. And I don't really have a problem with that. in the above picture, any idiot can get in the junction box, and lets face it, the NEC is often there to defend against idiots.
