Usually when I see bond/ground wires cut, there is a piece missing and has been stolen for scrap.
Sometimes the plumbers will disconnect when working on fittings by the clamp and don't reconnect..
We are required to bond the metal piping and structure to keep it from becoming energized in a fault condition. Ironicly, a neutral fault can end up energizing the piping, using it as a "return" path.
Full text of amendment...
From Oregon Amended Language, 2008 NEC...
250.52 Grounding Electrodes...
(B) Not Permitted for Use as Grounding Electrodes...
(3) In existing electrical installations, when a service change or upgrade occurs, an existing metal underground water pipe shall not be used unless the metal underground water pipe has been verified as suitable for continued use as a grounding electrode. An existing metal underground water pipe shall be bonded to the new grounding electrode system as required by 250.104(A).
Ah yes I forgot about amendments. I also forgot to look up the code today will do it tomorrow.
Is there any NEC rule that gives the maximum length of 4AWG grounding conductor wire that may be run from the panel to the location of the grounding electrode?
Does the code now or in the past, allow the copper piping system to be used as part of the grounding conductor from the electric panel to the grounding electrode?
4AWG wire to nearest point of copper pipe (say 12 feet away)
copper pipe runs thru house to well pump
near the pump, 4AWG wire from pipe goes into the wall penetration used by the well pipes
presumably to either a buried electrode, a metal well casing, or possibly down to be buried in the concrete foundation.