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Old 10-07-2010, 11:35 AM   #1
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prv jumper wire


I just installed a water pressure reducing valve. Plumbing all copper and have 200 amp electrical service. What size jumper do I need? Do I need to connect the jumper back to ground rod, to the panel, existing one at the water meter or can it just be connected to the inlet and outlet piping of the prv?

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Old 10-07-2010, 11:53 AM   #2
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Is the PRV right next to the meter? If so you can probably use one large jumper to go over both devices. One end on the inlet from the street (before the meter), the other end downstream of the PRV. This would save some money as you would not need to buy additional pipe clamps (about 5 bucks each).

I think you need a #6 green or bare jumper for 200A service.

Jumper wires do not need to go back to the panel or ground rods. The only point of them is to bridge the connection if a device is removed for service.
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Old 10-07-2010, 12:24 PM   #3
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The prv is about 7 feet away and the existing wire to the meter will not reach. As long as I can just jumper the prv, I'll get two feet of #6 bare and a couple of clamps. Thanks
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Old 10-07-2010, 12:26 PM   #4
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I might be mistaken but I think that 200 amps requires a #4 wire.
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Old 10-07-2010, 12:37 PM   #5
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I was mistaken it is #6.
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Old 10-07-2010, 01:44 PM   #6
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A #4 would be required on the water line jumper.
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Old 10-07-2010, 02:03 PM   #7
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Thank you, Jim. Just out of curiosity how did you determine I need #4?
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Old 10-07-2010, 02:09 PM   #8
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I used this chart....so I am curious as to why it is #4 also. Maybe there are specific rules regarding water pipe bonding?

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Old 10-07-2010, 02:44 PM   #9
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Use Table 250.66, not 250.122. Grounding electrode conductor are not sized the same as equipment grounding conductors.
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