Vince said:
I have a home office with a copier, laser printer, UPS, and a computer.
Only the computer is plugged into my UPS. When I turn on the copier or
laser printer, or when either one powers up from hibernate mode, the UPS
briefly clicks on. The house is only a few years old and the circuit is 15
amps.
I spoke to the electrical contractor. He simply said that if the circuit
breaker does not switch off, there is enough current and suggested
contacting a electronic equipment specialist.
I guess this has something to do with the voltage dropping when the
machines are turned on, but I am concerned this may damage or shorten the
lives of the equipment. Does anyone have any solutions to the situation,
or is it not an issue?
Thanks for any help,
Copiers and laser printers can draw a fair amount of current when their
heaters kick in.
But even at that, the voltage dip shouldn't really be all that bad.
You *might* have a loose/bad connection in that particular circuit (you
mention in another reply that the problem doesn't occur on another circuit).
This sort of thing could get worse over time and be a 'bad thing'.
If it's a 15 amp breaker in a fairly new house, I'll take a *guess* that
it's wired with 14 AWG wire. About how far away from the service panel is
the circuit? Other end of the house? Even at 80 feet, an 8 amp load should
only drop about 4 volts.
If you're handy with a VM, measure the voltage at the copier outlet with the
copier turned off, then turn it on and measure again. If the voltage drops
four volts or more, I'd say you have a problem that needs investigating.
Again, if you're handy with some home DIY projects and such, you can try
this. Find *all* the outlets on that circuit. *TURN OFF* the circuit
breaker. Go to each outlet, one at a time and do the following: 1) Check
with your VM that it really is turned off (safety first) 2) Remove the
cover and outlet from the box and check the wiring on the back. 3) If any
are 'stabbed' into a hole in the back, then insert a flat-blade screwdriver
in the slot next to the hole and release the wires. Take careful note which
wires were on which sides of the outlet. Connect the wires to the screw
terminals on the same side (wrap around the screw clockwise and get at least
3/4 of the way around) 4) make sure all screw connections are tight.
If you're not comfortable doing this sort of thing, hire a professional to
do it for you.
One friend was having problems with his stereo and TV equipment in the
living room. We checked all the outlets, and the connections in the service
panel. He was getting a large variation in voltage depending on how many
things he turned on (TV, VCR, stereo amp, turntable [oops, I'm dating
myself]). We *finally* tracked it down to an outlet in the baby's bedroom
that just happend to be on the same circuit. Behind the bureau, there was
an unused outlet with child-safety caps. When we went to check the voltage
there, we couldn't get the caps off because the plastic stabs had been
melted from the overheating. The wires on the back of the outlet were loose
causing a voltage drop and heating. My friend realised he could have had a
fire and was glad to find the problem. We replaced the outlet in the
bedroom and the appliances in the living room worked fine after that. Moral
is: Be sure to check *all* the outlets on a circuit.
daestrom