Installing an Underground Electrical Service and Pull Box
How to Install an Underground Electrical Service for a Home: Electrical Pull Box And a PVC 90 Degree Sweep to the Panel, Electrical Code about a Main Electrical Service Disconnect Switch.
Underground Electrical Service for a Home
Electrical Question: Dave, I worked in the electrical trade for years, but being retired for 8 years, I am faced with an electrical question.
- I am doing the underground for my new home.
- The meter with a 200amp disconnect is up the hill from the home.
- I have about 160 ft to the bottom of the hill where I want to put a pull box for the incoming conduit (3 ” PVC).
- From there it is 70 ft to the home where the load center is in the garage.
- A 230 foot length of PVC conduit is too long a pull for me.
- Can I put a pull box there instead of a PVC 90 degree sweep?
- Do I have to have a disconnect on the outside of the home seeing that I have a disconnect at the meter.
- The location of the main panel is not insight of the home.
This electrical wiring question came from: Robert, from Coos Bay, Oregon.
Thanks for your electrical wiring question Robert.
How to Install an Underground Electrical Service for a Home
Electrical Pull Box And a PVC 90 Degree Sweep to the Panel
- Robert, it sounds like you will have quite a pull from your primary electrical service to the home, so I can understand why you would like to put in the pull box before the sweep, and yes, this is allowed.
- At some locations I have installed pull boxes very close to the electrical panel where there is a long run of conduit, especially in locations where it will be must easier to pull from using a pull box rather than pulling into the panel.
Electrical Code about a Main Electrical Service Disconnect Switch
- The home will most likely be treated as a detached building, so yes the provision for a Main Disconnect will be required.
- ELECTRICAL CODE: A Main Breaker is required when there are more than 6 circuit breakers in the building panel, or when more than 6 circuits need to be turned off for all of the circuit power to be disconnected at the panel location.
- Install either a Main Breaker inside the panel, or a Disconnect Switch outside the building or inside nearest the point of entrance to the building.
- The panel board must be listed as suitable for use as Service Equipment.
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This article looks at common 120 volt and 240 volt house wiring circuits and the circuit breakers that are installed identifying the types and amperage sizes used in most homes.
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