ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
It's been an interesting career
by Fridayrack - 12/07/21 01:30 AM
From an outsider- How does tipping work?
by gfretwell - 12/06/21 06:37 PM
Photo Editing Software?
by Fridayrack - 12/03/21 05:05 AM
Square D "All-In-One" Panelboard
by NORCAL - 11/30/21 12:48 PM
Where is Everyone?
by luckyshadow - 11/21/21 10:14 AM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 15 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Sep 2006
Posts: 155
C
Member
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

Joined: Aug 2006
Posts: 356
Member
"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

Joined: Sep 2006
Posts: 155
C
Member
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

Joined: Sep 2006
Posts: 155
C
Member
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

Joined: Sep 2006
Posts: 155
C
Member
Oh normal feed in voltage is 245volts daytime, C

Joined: Nov 2007
Posts: 763
K
Member
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.

Joined: Aug 2007
Posts: 853
L
Member
Agreed, They only really noticed because they saw your truck there. smile


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
SafetyWired
SafetyWired
Pa, USA
Posts: 44
Joined: July 2013
Top Posters(30 Days)
NORCAL 1
Popular Topics(Views)
286,628 Are you busy
219,101 Re: Forum
205,193 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5