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Water heater bonding wire size. It appears that they want the all the water pipe to be bonded well enough to trip the main breaker for the service. The bonding jumper from the cold to the hot water piping system must be sized in accordance with section and table 25066. The reasoning is that the metal casing on the water heater itself is thought to be sufficient to complete the continuous grounding path between the cold water and hot water pipes in the home..
In many multiple occupancy buildings a metal water piping system is installed in each individual unit but the water distribution in the building or to the building is a nonmetallic piping system. What is minimum size ground do i need for a 200 amp panel. Still there are electricians and local building codes that vigorously defend the water heater bonding wire as a proper safety measure. Water heater bonding wire size.
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