ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by SteveFehr. 07/23/17 09:46 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,262 Are you busy
174,702 Re: Forum
167,097 Need opinion
Who's Online Now
0 registered members (), 63 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#11140 - 07/01/02 05:26 PM 123.9 VAC drops to 122.4 ???  
strainsa  Offline
Junior Member
Joined: Aug 2001
Posts: 3
After installing a new outside AC compressor the voltage at any outlet drops from 123.9 to 122.4 whenever the AC starts. This causes a momentary flicker in the household lights about 80% of the time. The AC company has installed a hard start capacitor with no change in the flicker. I had the utility company come out and they checked the voltage across the meter and saw the same thing. They said it is OK and within their specifications. Are they giving me a straight answer?


Work Gear for Electricians and the Trades

#11141 - 07/01/02 07:33 PM Re: 123.9 VAC drops to 122.4 ???  
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
White Plains, NY
I believe they can give you plus or minus 10% of nominal. So, If nominal is 120V then the math looks like 108-132V. How big is the service, how bid is the compressor?
It might also be an undersized service or service conductors. Have you completed a demand calc for this new load with the existing arrangement?


Ron

#11142 - 07/01/02 11:14 PM Re: 123.9 VAC drops to 122.4 ???  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Sounds like superb voltage regulation. ANSI limits are ~110-127, and these numbers are in most utility and appliance manufacturer boilerplate.

Incandescent lamp flicker can be very difficult to subvert, for the human eye is very sensitive to it. Looks like everything is up to snuff and then some.


#11143 - 07/02/02 05:58 AM Re: 123.9 VAC drops to 122.4 ???  
Trainwire  Offline
Member
Joined: Mar 2002
Posts: 360
Strasburg,PA,USA
Join the club, Ihave the same problem with My AC. When I had the 200 amp panel, meterbase and service entrance put in, the poco didn't bother to change the drop off the pole, so I have 2awg drops feeding a 4/0 service entrance, in the summer time when the other 2 houses on the transformer are running their ac too, I get a very pronounced flicker.
This is the ac's third season, so far so good.

Trainwire



Member Spotlight
richard
richard
L.I. New York
Posts: 95
Joined: August 2003
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.002s) Memory: 0.7600 MB (Peak: 0.8939 MB) Zlib enabled. Server Time: 2017-07-24 02:37:35 UTC