INcoming cable support/tubing

[tulum]

Hello,

I am looking for help from the utility side of things. I have a swtichroom I am installing and need to bring a 600vac service into the building. What do I use for the incoming "tubing/mast"? It will be coming in via rooftop, and will need some sort of tubing. I was also thinking that it may need some type of insulator to secure an anchor to so as not to put to much tension on cables and the building. The cables will be 3c#2.

Does anyone have a spec/drawing for this type of installation.

Regards,
TULUM

 

[cuky2000]

The best source is your local utility company. Ask them for the "Service Entrance Handbook" or check if they have post this information in the internet.

As a sample see the figures 17 to 19 on the enclose site. Beware that this could be different for each utility company.

http://www.conectiv.com/cpd/pdf/Elec_Serv_Hndbk.pdf

 

[EEJaime]

You do need to discuss this with your local utility company, however, small services such as this, which appears to be a 100A., 347/600vac, 1ph, 3-wire service would normally require a length of galvanized Rigid Steel Conduit, extending far enough above the structure to allow the clearances mandated by the utility company. For a 3c/#2awg this could be a 1-1/2" conduit. This would have either a crossarm fitting to support the incoming conductors, or in some cases a steel messanger cable is used and tied to the conduit riser with clamps and the conductors are strapped to the cable-it depends on the distance the service lateral conductors have to run from the pole. You will need a weatherhead on the riser to allow the conductors to enter the riser without allowing rain to enter. And of course the riser must be secured rigidly to the structure. Normally it is located so that the service conductors drop through the riser directly into the metering can. In my area the primary conductors between the pole and the meter are specified, furnished and installed by the utility company. The customer is rarely allowed to touch anything on the primary side of the meter. You need to contact the Service Planner for the utility in your area.