The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
ghost307 7
HotLine1 7
renosteinke 6
Potseal 4
Who's Online
2 registered (HotLine1, gfretwell), 304 Guests and 6 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#84088 - 03/09/03 01:57 PM load calculations
elecbob Offline

Registered: 08/23/02
Posts: 142
Loc: WA
I did some load calcs for a residential triplex. Each unit totalled 50 amps. The house load was 55 amps. The service load totalled 174 amps. The building is in an undergrounded area and the only service voltage available is 480 volts, single phase. I want to install:
A 100 amp 480 volt safety switch.
A 50 KVA transformer to supply the 120/240 volts.
A meter pack rated at 200 amps.
4 - 60 amp panels.
Think it will fly?
Thanks Bob

2014 / 2011 NEC & Related Books and Study Guides
#84089 - 03/09/03 04:34 PM Re: load calculations
caselec Offline

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
Bob, Are you saying that the utility will not supply you with a 120/240 volt service?

The only way I can imagine a utility accepting an installation as you described is to install a 480 volt meter before the disconnect and transformer then have 4 customer read meters on the secondary side of the transformer. How would the utility control future un-metered loads being connected to the disconnect or transformer?

Curt Swartz

#84090 - 03/09/03 07:15 PM Re: load calculations
elecbob Offline

Registered: 08/23/02
Posts: 142
Loc: WA
I erred on this one. The utility wants to install a pad mounted transformer on a 48" by 56" pad in the back yard. Not good. My option is to install a meter ahead of my own transformer in the basement. I couldn't seperately meter the units but the heat and hot water are central so it shouldn't be a big deal. Not the best solution but cheaper and more doable.
[This message has been edited by elecbob (edited 03-09-2003).]

[This message has been edited by elecbob (edited 03-10-2003).]


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals