On May 6, 2:45 pm, Sjouke Burry
wrote:
Can you trim W_tom with that?? Or is he incurable?

He is incurable as long as others post outright lies and myths while
denying what really provides surge protection. Now to discuss what is
relevant.

If in sand, a single ground rod is probably insufficient earthing.
For example, a FL couple suffered repeated direct lightning strikes to
their bathroom wall. They have lightning rods installed. Lightning
again struck that exterior wall. Lightning rods were earthed by 8'
ground rods only in sand. Plumbing inside that wall connected to
deeper (more conductive) limstone. Lightning found a better
connection to deeper limestone via the bathroom wall.

What will provide sufficient earthing? Without knowledge of the
underlying geology, some will expand that earthing with a buried wire
around the entire building (halo or ring ground). Others will may
install a large and interconnected network of ground rods. Do you
need that much? Expanding the earthing may be easier than learned
later it was not sufficient. Also useful is to canvas the
neighborhood to learn what others have experienced for ten or more
years.

Reducing earth resistance is not as important as creating single
point ground with a shorter connection, more conductive (impedance)
than any other path, AND creating equipotential beneath the building.
Too many assume a water pipe is better because it is longer. But a
better earth ground meets two slightly different criteria -
conductivity and equipotential. IOW some ground rods located short to
all 'whole house' protectors may be superior earthing than the water
pipe. Appreciate that wire length may be more critical than the size
of an earthing electrode.