ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
twh 3
Recent Posts
Nec circuit protection
by Yoopersup. 11/22/17 03:22 PM
FPE in Germany
by Texas_Ranger. 11/19/17 07:30 AM
Ceiling fan distance from outdoor hot tub
by gfretwell. 11/16/17 02:18 AM
diazed fuses
by Texas_Ranger. 11/13/17 03:02 PM
Theft deterrent alarm
by gfretwell. 11/12/17 01:39 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
242,649 Are you busy
178,865 Re: Forum
170,079 Need opinion
Who's Online Now
0 registered members (), 17 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#191005 - 12/15/09 03:18 AM apartment upgrades causing dimming lights?  
crselectric  Offline
Member
Joined: Sep 2006
Posts: 133
albany, ca
I recently upgraded 4 of 6 apartments in Oakland, the existing tenant is complaining that her lighting is dimming, caused by the "additional load", I changed the 30amp 120volt fuse panels, for each apt. with 240v 60amp panels and changed the 40 amp single pole breakers(2pole with only A phase connected)in recently "upgraded" meter pack to connect the units to both phases, to include the unused phase, the main disconnect has 200 amp fuses. the entire square footage and calcs only comes to 175 amps. and i'll have to check but I believe the guy put in 4/0 copper service conductors....correct me if I'm missing something but I cant see how upgrading the other four apt. would have any effect on one of the existing ones that has not been improved? chris


Work Gear for Electricians and the Trades

#191006 - 12/15/09 03:49 AM Re: apartment upgrades causing dimming lights? [Re: crselectric]  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
"I believe the guy put in 4/0 copper service conductors...." If you You mean PG&E then they usually install 4/0 Aluminum for underground service.
It could be a loose connection at the service point or in the service equipment.

is it one tenant that is having dimming lights or others are having the same problem?

It could also be that when a motor load turns on the lights dim, and probably it has been the case all along but she just started to notice it.

Does the apartment have elevators?

I would recommend you visually confirm the dimming and then install a recording meter and check for high and low voltage reading.

i am sure others will give you pointers as well.


Be kind to your neighbor, he knows where you live


#191007 - 12/15/09 04:35 AM Re: apartment upgrades causing dimming lights? [Re: Niko]  
crselectric  Offline
Member
Joined: Sep 2006
Posts: 133
albany, ca
from the records the service was upgraded around 1987 by ampm electric, but connecting all on one phase was what surprised me, I didnt see any thing that looked bad though, I'll check the connections, its a OH 3 inch riser, 400 amp fpe disco, which looks well designed surprisingly, chris


#191117 - 12/18/09 02:38 PM Re: apartment upgrades causing dimming lights? [Re: crselectric]  
crselectric  Offline
Member
Joined: Sep 2006
Posts: 133
albany, ca
so I checked the main disco and there is slight corrosion on the lug for one phase, not the neutral as i thought might be the case, and each apt calc.s at 35 amps 240v. the complaining unit is still on a 40amp breaker. there is a sump pump on the new house panel and there are number 2/0 wire feeding two stacks of 3 and four meters from a hot gutter split bolted to 4/0 copper. my question is would I connect the recoding meter to the effected unit feeders or the main service wires.? this is the first time i've done a multi unit upgrade. thanks chris


#191118 - 12/18/09 02:40 PM Re: apartment upgrades causing dimming lights? [Re: crselectric]  
crselectric  Offline
Member
Joined: Sep 2006
Posts: 133
albany, ca
Oh normal feed in voltage is 245volts daytime, C


#191122 - 12/18/09 06:10 PM Re: apartment upgrades causing dimming lights? [Re: crselectric]  
KJay  Offline
Member
Joined: Nov 2007
Posts: 763
MA, USA
I'll bet when you upgrade that remaining 120V/40A feeder and panel like you did with the others using both sides of the single-phase, the voltage drop problem in that unit will disappear.


#191124 - 12/18/09 06:31 PM Re: apartment upgrades causing dimming lights? [Re: KJay]  
leland  Offline
Member
Joined: Aug 2007
Posts: 853
Lowell area, Ma. USA
Agreed, They only really noticed because they saw your truck there. smile



Member Spotlight
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.017s Queries: 15 (0.003s) Memory: 0.7846 MB (Peak: 0.9410 MB) Zlib enabled. Server Time: 2017-11-24 00:16:30 UTC