Wire from electric company to house meter, contained by a conduit, what size? If your house wiring goes underground within a conduit from the...
If your house wiring goes underground within a conduit from the electric company connection to your meter at your house, how many inches surrounded by diameter is that conduit pipe? It depends on whether you have 100A service, 200A, 300A, or 400A. What does the diameter have to be contained by those cases?
http://www.nfpa.org/aboutthecodes/list_o... will acquire you to NFPA Codes on Line. NEC is #70. You will be able to see the NEC, but not copy it. here in shelbyville tn i enjoy 2ea 200 amp boards. 3-1/2 " is the required dia. be smart and contact your electric provider for correct size
USA Per the National Electric Code, conduit size is based on the number and size of conductors, not how many amps. For example, three 3/0 copper THHN conductors will fit into a 2 inch conduit, whether for a 100 or 200 amp service. However, utilities do hold the authority to regulate the size of the conduit. Most underground services up to 400 amp are in minimum 3 inch diameter conduit, provided the conduit length does not exceed two hundred feet, the conductor size does not exceed 500 KCMIL, and a maximum three conductors. Definitely check beside your local electric utility or a licensed electrician. Different local utilities have different requirements for conduit sizing. Some will go by the National Electrical Code, and others (most) will jump by their own specifications. A call to your local utility company will get you your best answer. Utility companies close to to keep things as simple as possible so many use just 2 sizes of conduit, 2" and 4''. This helps to cut down on stuff they need to own on the trucks and in the warehouses and the larger pipe sizes trademark installing the with into the conduit much easier. Call them to get the right answer.
Answers: per nec tables
100A, 3-1conductor #2 awg type thw 75C, conduit 1-1/2"
200A, 3-1conductor #3/0 awg type thw 75C, conduit 2-1/2"
300A, not standard
400A, 3-1conductor 600 mcm type thw 75C, conduit 4"
conduit size determined by nec based on percent saturate.