Also in the Polyphaser's doc's quoted in earlier posts they recommend GRC
grounded at both ends. This seems to me the same idea to equalize voltages in
the system. The GRC also is a choke to current surges and would limit the surge
as you quoted to a shorter distance than without GRC. This is current limiting
and not voltage limiting.
I see no problem with the use of the hardline outer conductor for this
purpose providing you use low impedance straight line connections at each end.
NEC allows the outer to be a conductor as long as it is grounded at each end.
This exceeds the GRC requirement of Polyphaser with the joint-less runs.
Without the proper joint compounds in a GRC run you have lost conductivity in
just a few years.
You still need the ground wire in the 120/240 AC run to satisfy NEC. The GFCI
protection is also a NEC requirement and is a place not to be cheep as others
have cautioned. Be sure ground wire is grounded at both ends. Yes I know this a
ground loop but I haven't been able to convince any inspectors in 2 states that
I can dispense with the second connection and comply with the 2005 NEC. Out
here we have state and city codes also, which makes you have to consult 3 code
books on some installations and different requirements just yards apart.
We used to have a inspector that was a ham and that made things a lot
easier.Also way back in the early 70's it helped to know what the inspectors
favorite beverage was. Alas those days are gone!
Good luck Dick,
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