On Sat, 24 Oct 2015 06:41:28 +0000 (UTC), gregz
wrote:

wrote:
On Fri, 23 Oct 2015 23:22:17 -0500, Muggles wrote:

On 10/23/2015 11:18 PM, wrote:
On Fri, 23 Oct 2015 22:42:20 -0500, Muggles wrote:

[...]

We now have battery back-up/surge protectors for our computers that's
supposed to protect from those sort of lightning issues.

Unless they are "dual conversion" UPS units you are not getting the
protection you think you are.

Dual conversion?
Yes Also known as OnLine or full-time.. A more expensive unit that is
a "separately derived power source". AC Line voltage is converted to
DC through an isolation transformer and charges the battery. The DC is
then converted back to AC to run your computer.. There is no
switch-over time and only the ground is electrically connected to the
"mains" power.. They generally have superior surge isolation compared
to standby (the typical low end unit like an APC BackUPS) or line
interactive (the better more expensive units that can adjust line
voltage up or down without going on battery)

Great unit. Unfortunately, ground surges can still occur if there is more
than one ground, loop.

Greg

Please explain. If all connected equipment is on the same UPS where do
you get "more than 1 ground loop"?