Flickering lights on one circuit

Probably not the breaker, although you could test that by moving the wire from the current breaker to an adjacent one (purists will tell you to exchange the wires).

Next step is to check the connections at the outlet.

If the wires are back-stabbed, un-stab them and attach the wires to the outlet's screws.

First thing you want to do is identify everything on that circuit. If outlets other than the lights in that room don't cause flicker, the problem isn't at the panel. If the lights are ceiling lights, and controlled by a switch or dimmer, I'd check there. You need to give more info about the lights, such as the type. If they're low voltage and controlled by a dimmer, that could be an issue as well

And, are they other lights in the house doing likewise? It might be that it's only noticeable in that room. For example, my den shares a wall with the kitchen and when the refrigerator kicks in there's a barely noticeable dimming of the overhead light for about one second.

JAT.

Only the lights on this circuit do this. And, it is not a huge flicker....... just a detectable flicker, and not all the time.

Lights that are plugged into more than one outlet on this circuit do this, so I know it isn't just one bad outlet. These are ordinary lamps, with 100 watt bulbs. These are not ceiling lights.

Thanks for all the helpful replies !! I will keep monitoring this and see if I can narrow it down some more.

James

do you have a laser printer or fishtank heater or something like that plugged in on the same circuit?

Mark

What other items are on that circuit? Since you can have multiple outlets, in multiple rooms, on one circuit, you may have a load/usage problem on that circuit.

Work backwards and isolate. :~)

Most fax machines are not high current devices.

Yes, turn the curcuit off and have it checked by an electrican. The sitation is mostlikely very dangerous and could result in a fire.

That is good advice. This could be a floating neutral.

Yes, I do have a laser printer plugged in to this circuit.

I know it draws a lot of current when operating, but mostly it is in the sleep mode.

James

When I had a circuit flicker it was the BUS in the breaker panel.....the Galvanized bus was corroding..... maybe I've been told from mild water damage(panel is under the kitchen sink area in the basement). When the lights flickered I could hear a soft crackling noise in the panel(definitely unsettling). I pulled the suspect breaker and saw damage on the breaker connectors, cleaned up the bus spot some, replaced the breaker and a few months later the flicker returned. I then polished/cleaned surrounding breaker connectors and moved the circuit(another new breaker) to another spot(no more flicker). I'm about to replace the panel(next week). My panel is almost 30 years old but the suspect breaker was added about 10 years ago. If your breaker & bus shows no damage I would carefully check every connection, switch etc. on that circuit and/or hire an electrician.....the circuit could be asking for a fire. Incidentally due to a panel design change(code) I'll need to run new wires from the meter to the panel(short easy run) as they have lengthened the distance from the top of the panel to the main cutoff breaker. Rod

Indeed.

"Sleep" mode does not mean it's completely powered down, just as being asleep at night doesn't mean you're dead. Hopefully.

Craig, I think that you are exactly right. I think that when the laser fax is in "sleep" mode, it doesn't use much power....... but in just Standby, I bet that lamp does come on and off, as you said.

I did an experiment this evening. I watched the fax, to see when it went into sleep mode. AFter it does go into sleep, my lights don't flicker. I had not noted that before. I think this is the cure (or answer) to this problem.

Thanks to Craig and to all others ! I think all of the points made were good points, and things to think about.

James

Any heavy load on that circuit, or depending upon your electric service size and demand, a heavy load anywhere in the house should cause "dimming" on lighting circuits, but "flickering" is a different animal, it's caused by loose connections. Loose connections over time will invariably get worse. Even if you install a dedicated circuit for the printer, you still may experience the flickering until the bad connection is located and corrected

Just a caveat...while the old stab connections are notorious for poor connections...the new "commercial grade" designs are excellent (with copper wire). (Hubbell, Leviton, P&S)

I have seen same thing happen in offices and other places where copiers are used, its funny how many power drawing devices some people plug into the same line the copier is on, have seen once a HP laser printer, and a copier on the same circuit, the copier draws 12 amps, plate on the back shows that, laser printer draws 11.2 amps as I recalled, tried to tell the people in the office this was not good, they did not belive me till I hit the copy button while the printer was printing, yepp...tripped the breaker, they re-located the printer next day. :) If you can get it to a line by its self it will help.