lights dim occasionally


  #1  
Old 11-19-14, 06:24 AM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
lights dim occasionally

The lights in the house dim occasionally.
I've noticed this when I have a slow combustion burner fan on and it changes speed. I am not sure if the fan is changing speed or the dimming causes it to change speed.
They are both on 15A circuits but different circuits.
Is this normal?
 
  #2  
Old 11-20-14, 07:16 AM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
Should this only happen if they are on the same circuit?
 
  #3  
Old 11-20-14, 10:12 AM
Z
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 6,099
Received 422 Upvotes on 375 Posts
Most people notice lights dimming momentarily when large motor loads are started up. Usually this means the A/C, clothes dryer or vacuum cleaner. This is quite normal and has to do with the large startup load for the larger motors.

I find it a bit odd that it's happening with a smaller motor, but it's quite possible it can be caused by that. Are both these circuits on a subpanel? Or do you only have one main panel in your house?
 
  #4  
Old 11-20-14, 10:34 AM
Q
Member
Thread Starter
Join Date: Jun 2014
Location: Canada
Posts: 1,658
Received 1 Upvote on 1 Post
One main panel...(actually there's a distribution panel but these lights and receptacle are not on the circuits in that panel).
It's not on start up but whilst it's actually running.
The lights are on a dimmer.
I can't tell if the motor is changing speed momentarily or if the dimmer is mybe fluctuating the light but I hear the motor change speed and the lights dim at the same time.
 
  #5  
Old 11-20-14, 02:57 PM
chandler's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Dec 2005
Location: USA
Posts: 36,607
Upvotes: 0
Received 9 Upvotes on 8 Posts
It may not have anything to do with the motor you are questioning. It can happen with your refrigerator turning on using a completely different circuit. It can happen with your house heat, or, as Zorfdt indicated many other applications.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: