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Electrical- Upgrading the Main Electrical Panel
The following 10 items pertain to upgrading the main electrical panel in a single family dwelling:
1. An electrical permit is required to upgrade the main service panel.
2. The owner or a state contractor may obtain a permit.
3. Plans are not required.
4. Load calculations are generally not required for a service upgrade unless additional load is being
added and the inspector determines that calculations are necessary.
5. Under the main service entrance is not required unless,
a. The existing service entrance is underground.
b. If required by the Planning Department or Southern California Edison.
6. The height to the center of the meter must be between 48" to 75" above the ground.
7. The clear working space in front of a panel is 30" wide by 36" deep with a minimum headroom
clearance of 6'6''.
8. Circuit breakers,
a. Circuit breakers must be listed and approved types for panels ( the brand of breakers must be
specifically approved for use with the panel as stated on the panel's label.
b. A multi -wire circuit (3 -wire, 240 volt circuit) to a single duplex receptacle requires a handle -tie on the
circuit breakers. This is commonly the case where a single duplex receptacle serves both the garbage
disposal and the dishwasher.
9. Grounding shall be per the California Electrical Code- See Table 250-66 to size the grounding electrode
conductor.
a. The water piping system is not allowed to be the sole grounding source.
b. A ground rod must be buried at least 8' in the ground. When made of iron or steel, the ground rod
must be a minimum of 5/8" diameter. Listed stainless steel or nonferrous rods may be 1/2" in
diameter. The ground rods should be located as close as practical to the electric service.
c. Two ground rods will be required, unless the installation is shown to pass the 25 ohm or less
resistance to ground test. The ground rods must be separated by not less than 6'.
10. Bonding shall be per the CEC, see Table 250-66 to size bonding conductors.
The water piping system must be bonded,
a. If the main water service piping to the house is metallic, the bonding must occur within 5' of
where the water service enters the house. (Only if it is used as part of the electrode grounding system)
b. Made electrodes of the rod, pipe, or plate type that supplement a metal water pipe grounding electrode
shall not exceed 25 ohms to ground resistance.
c. If the main water service piping is non-metallic, the cold water piping system may be bonded at any
accessible location. (Piping is commonly bonded at the water heater.)
d. The hot and cold water piping systems are effectively bonded together via plumbing mixing valves at tubs
and showers, etc. Therefore a single bond to the cold water piping is acceptable.
11. The gas piping must be bonded. CEC 250-104.
a. The gas piping system is bonded to the cold water piping system typically at the water heater via a bonding
jumper.
b. Gas bonding shall only be connected to the house side of the meter.
c. For additional grounding and bonding requirements, refer to the CEC, Article 250.