Service Tap and Concrete Encasement

[Tainted]

In New York City, where does it say in the code concrete encasement is required for service taps after the service end box and before the main service switch? I see in buildings a lot of time service conduits are encased in concrete but I can't find it anywhere in the code. I am doing a job where I need to do a service tap to feed a commercial space in the same building. Thank you

 

[electrofelon]

In New York City, where does it say in the code concrete encasement is required for service taps after the service end box and before the main service switch? I see in buildings a lot of time service conduits are encased in concrete but I can't find it anywhere in the code. I am doing a job where I need to do a service tap to feed a commercial space in the same building. Thank you

I cannot speak of NYC amendments, but per NEC what you are looking for is 230.6 and 230.70(A)(1)

 

[Tainted]

I cannot speak of NYC amendments, but per NEC what you are looking for is 230.6 and 230.70(A)(1)

I've seen these 2 codes before but these don't explicitly tell you that you are required to encase these conduits in concrete unless I am reading it wrong.

 

[david luchini]

I've seen these 2 codes before but these don't explicitly tell you that you are required to encase these conduits in concrete unless I am reading it wrong.

230.70(A)(1) tells you that an interior service disconnect must be nearest the point of entrance of the service conductors. You have described a situation where the service conductors enter the building and then run further into the building in conduit to the service disconnect. The location of the service disconnect, therefore, does not comply with the requirements of 230.70(A)(1).

230.6 says that if the service conductors inside the building are encased in concrete, they are considered to be outside of the building. So you can run the service conductors inside the building, encased in concrete, up to the service disconnect, and then the service disconnect location will comply with 230.70(A)(1)...it will be nearest the point of entrance of the service conductors.

 

[Tainted]

230.70(A)(1) tells you that an interior service disconnect must be nearest the point of entrance of the service conductors. You have described a situation where the service conductors enter the building and then run further into the building in conduit to the service disconnect. The location of the service disconnect, therefore, does not comply with the requirements of 230.70(A)(1).

230.6 says that if the service conductors inside the building are encased in concrete, they are considered to be outside of the building. So you can run the service conductors inside the building, encased in concrete, up to the service disconnect, and then the service disconnect location will comply with 230.70(A)(1)...it will be nearest the point of entrance of the service conductors.

The problem is they don't tell how much allowance of length the conduits can be exposed. They only tell you "nearest point of entry" but they don't tell you up to how many feet is considered the "nearest point of entry".

Furthermore the conductors enter the building into a service end box, isn't the service end box considered the nearest point of entry? There can be multiple points of entry?

 

[Tainted]

What if the room is 2 hour fire rated does it have to be concrete encased?

 

[electrofelon]

The problem is they don't tell how much allowance of length the conduits can be exposed. They only tell you "nearest point of entry" but they don't tell you up to how many feet is considered the "nearest point of entry".

Furthermore the conductors enter the building into a service end box, isn't the service end box considered the nearest point of entry? There can be multiple points of entry?

Correct, nearest point of entry is left up to the authority having jurisdiction to define. As far as entering the building and then going back out and coming back in, the code does not offer any guidance on that. You may want to talk with your ahj or someone familiar with the practices there.

 

[ron]

NYC's Electric Code is made up of amendments to the 2008 NEC.

You can read the amendments at the link below, but I think you will find nothing really changes from the comments you saw above.

https://www1.nyc.gov/assets/buildings/pdf/ll39of2011_electrical_code.pdf

 

[Tainted]

NYC's Electric Code is made up of amendments to the 2008 NEC.

You can read the amendments at the link below, but I think you will find nothing really changes from the comments you saw above.

https://www1.nyc.gov/assets/buildings/pdf/ll39of2011_electrical_code.pdf

NYCEC 230.6 reads "(5) Where installed in service and fire pump rooms having 2 hour rated construction."

Does this mean if the conduits are installed in a 2 hour rated electrical service room, it doesn't need to be encased in concrete since the conductors are considered to be outside?

 

[Tainted]

Correct, nearest point of entry is left up to the authority having jurisdiction to define. As far as entering the building and then going back out and coming back in, the code does not offer any guidance on that. You may want to talk with your ahj or someone familiar with the practices there.

How do I get in contact with the AHJ? I'll be honest I never contacted the AHJ for anything.

 

[ron]

How do I get in contact with the AHJ? I'll be honest I never contacted the AHJ for anything.

E.C.R.I.C

 

[Tainted]

E.C.R.I.C

Found this extremely vague response from the interpretation list

1. What is the maximum length of trough allowed between the P.O.E. box and the service switch? (5/7/2003)
   The service switch must be located as close as possible to the P.O.E. Such installations are subject to case by case approval. Article 230-70 of the 1999 NEC.