On Sunday, July 2, 2017 at 3:04:18 PM UTC-4, Dean Hoffman wrote:
On 7/2/17 11:39 AM, Oren wrote:
On Sat, 1 Jul 2017 07:08:38 -0400, "Sherlock.Homes"
wrote:

Seems to be 120vac from red to ground and 120vac from black to ground but no
voltage between red and black, which should be 240vac. Reading was taken at
the external dissconnect. What might cause this?

Thanks,
S


Does this disconnect have fuses? Test the fuses individualy. They
burn out starting near the center.

One trick to test fuses is to check voltage from one end of the
fuse to the other.
It would be the same method as a continuity test. So I've been told
anyhow. Have you ever tried the end to end voltage test?

That works if the fuse is in a complete circuit, you'd get 0 V
if the fuse is good, full line voltage if it's open. But if
it's not a complete circuit, then you'd get zero either way.