A friend of mine in New Jersey got a new furnace and hot water heater.
The installers said code required installing a "jumper wire" between the HOT
and COLD water pipes on the heater. It looks like a 2 foot piece of number 6
wire with 2 clamps with teeth on them and goes from HOT to COLD water pipes on
top of the heater.
Yes, the house electric system is grounded to the street side of the water
meter coming into the house.
Considering people lived for 50+ years in these houses without this jumper, WHY
is it needed now ???
I had no answer for my neighbor and the salesman who gave the sales spiel did
not have a clear answer and fell back on the "it's code" answer.
WHY is this jumper needed ?