On Sat, 13 Nov 2004 21:59:49 GMT, "Mark Jerde"
wrote:

In this situation, grounding a DC to a good earth
ground, should there be a current-limiting resistor somewhere between the
water pipe and wire going through the DC system?

No.

Resistors in grounding systems are only there when grounding
personnel. It's not needed for static, but it can save lives. An
accidental mains-voltage electric shock can be painful in a typical
situation, but fatal if you have an arm grounded with a low-impedance
path to ground. A mere few megohms makes no difference to grounding
effectiveness, but it's a significant barrier to mains voltages.

--
Smert' spamionam