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Residential Electrical Grounding & Bonding











Residential Electrical
Grounding & Bonding



INFORMATION
GUIDELINE

April 2004
City of Concord Building & Neighborhood Services 1950 Parkside Drive, MS/51 Concord, CA 94519 (925) 671-3107 Fax (925) 680-4877

Electrical - Upgrading the Main Electrical Panel
The following items pertain to upgrading the main electrical panel in a single family dwelling :
An electrical permit is required to upgrade the main panel.
The owner or a State licensed contractor may obtain a permit.
Load calculations are generally not required for a service upgrade unless additional load is being
added and the inspector determines that calculations are necessary.
Meter Height: Shall be between 48" to 66" above the ground.
Clear Working Space: 30" wide by 36" in front of panel .

Circuit Breakers

Circuit breakers must be listed and approved types for panels (The brand of breakers must be specifically
approved for use within the panel as stated on the panels label).
A multi-wire circuit (3-wire, 240 volt circuit) to a single duplex receptacle requires a handle-tie on
the circuit breakers

Grounding
Any work involving adding sub-panels, upgrade of electrical service, change of water service, or re-
piping of a structure will require upgrading of the grounding and bonding of the electrical service.
Grounding shall be per the 2001 California Electrical Code
Water pipe grounding electrode shall have a supplementary grounding system installed (2 Ground
Rods).
A supplemental electrode (usually a ground rod) must be installed if the water piping system is the
only source of grounding.
2 ground rods must be at least 8 feet buried in the ground with minimum of 6 feet apart. When made
of iron or steel, the ground rod must be a minimum 5/8" diameter. Listed stainless steel or non-
ferrous rods may be 1/2" in diameter.
Grounding electrode conductor shall be connected within 5 ft. from the point of entrance to a cold
water pipe grounding electrode. (2001 CEC Section 250-30 Item 3)
Bonding shall be per 2001 California Electrical Code.


The water piping system must be bonded

If the main water service piping to the house is metallic, the bonding must occur within five feet of
water piping into the building.
If the main water service piping is non-metallic (e.g. - PVC), the cold water piping system may be
bonded at any accessible location.
Bond where water and gas pipes are convenient. Bond clamps shall be accessible.

The gas piping system must be bonded

The gas piping is bonded via the grounding conductor in the branch circuit to the gas appliances (if
availabl</i>e).
If the electrical system does not contain equipment grounds, then the gas piping system must be
bonded externally with a bonding jumper (same as water pip</i>e).

Gas bonding shall only be connected to the house side of the meter.