On Fri, 17 Oct 2003 03:53:44 -0400, "Wild Bill" wrote:
If it was certain that voltage spikes were the cause, individual suppressors
could be installed across the line-ground (and neutral-ground) connections
where the AC voltage enters the furnace.

Also one line to line for differential surge. The two you describe only clamp
common mode surge.

These are small inexpensive devices with 2 leads that can be wired into the
furnace's power terminals. These are the same supressors found in most surge
supressor power strips.

Except that good surge suppressor power strips also have inductor capacitor
low pass filters as well as the MOVs.

Gary