On Tuesday, 1 May 2018 05:55:01 UTC+1, Fox's Mercantile wrote:
On 4/30/18 11:14 PM, John Robertson wrote:

I trust the variac is grounded, so this may be an arc to
the case...or failing insulation on the power cord. How
OLD is this variac anyway?

Since it's on the "hgh" (boost) of the variac, He's got
between 120=135 vac to gound at that point.

And knowing Jurb, it's probably something he fished out of
a dumpster 30 years ago.
He's already admitted to "fixing" it twice already.
I doubt he did a good job either time.

Variacs are all (or almost all) many decades old.


NT