all originally built 1979.
circuit used only for a/c (single outlet). runs thru 20 breaker in panel , then
15 aml type sl
fuse on each line (black, white) in nearby fuse box. then about 25 to 30
concrete floor) to a/c putlet.
i've noticed original 20a breaker has been disconn, and rewired to new 20a
lowest positoin in panel, suggesting the original breaker failed.
originally slightly larger a/c. when choosing 2001 replacement (physically
smaller) i think it
had slightly larger cooling capacity.
this are "window" a/c installed per instuctions into original wall framing,
siding, etc. 12 amp
it seems to blow fuses only in this drastic heat wave. after the a/c has been
overnight (much longer than 6 hours, possibly only after 10+ hours). two recent
occurred only after cool, 10pm and midnight.
How compressor was cycling is unknown to me. a/c is decently qiuet, and no one
expecting fuse blow, so no one was trying to listen . How a/c may have been
cycling depends on thermostat setting. and thermostat is just a numbered knob
i've noticed the brigtht solder-like coating seen thru "window" of *both*
looking gray. only one fuse blows, so i assume both got very hot, then one blows
sligthly more susceptible, or hit by additional tiny transient, or whatever
chose that fuse.
only once did i *witness*
the a/c stop due to fuse blow. unfortunately i don't
know if the
fuse had blown maybe 10 or 15 min before anyone noticed a/c had stopped.
the fuses were warm (not hot) the cover plate of fuse box was warm.
Box is 4 octagonal or 4 square (more likely but can't recall for sure). box
might be deeper
than standard but i don't think so (again as i recall from when invesigating
earlier weird fuse
behavior, not incl this post)
cover is flat, but with fuse sockets and flip cover over each socket. socket
into box, but hte covers also protrude from wall obnoxiously (approx 1 inch).
that's enough descriptuon (if relevant) because i can't find pic on google
the sl sockets may be adapters, but the fuses screw in tightly.
any suggestions where to look?
have questions about facts or evidence missing from my description?
i see fuses in addition to breaker for a/c compressors so i assume the sl fuses
("slow blow") are economical method to give different type wiring protection
than the regular
household panel breaker (not designed for motorstart circuits).