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!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
breaker meltdown
by sparky
Yesterday at 07:30 PM
230 or 345 kV transmission lines?
by Vlado
09/24/16 09:33 AM
Electrical mast flashing product
by ThomasWinfrey
09/22/16 12:14 AM
What estimating software do you recommend?
by sparky
09/21/16 07:20 PM
"Dry Run" Inspection goes awry
by HotLine1
09/20/16 07:39 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
HotLine1 13
sparky 10
gfretwell 8
sparky66wv 8
Vlado 6
Who's Online
0 registered (), 254 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#191846 - 01/15/10 08:53 PM Wiring for office cubicles
SJT Offline
Member

Registered: 07/24/02
Posts: 242
Loc: PATCHOGUE, N.Y.
Is there a rule of thumb for the amount of circuits to be ran in an office setting with approx. 10 cubicles. Each would have a computer, monitor, and printer. I'm going to figure 1 amp for a single computer, and 1 amp for a single monitor. Are the desktop printers in the range of 2 amps? The computers, I would think should be figured with continuous duty, 125% added in. Thanks

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#191849 - 01/15/10 10:06 PM Re: Wiring for office cubicles [Re: SJT]
noderaser Offline
Member

Registered: 03/01/07
Posts: 405
Loc: Portland, Oregon, United State...
CRT or LCD monitor? Inkjet or laser printer? Computers can vary a lot, depending on how much kludge is in the box... A standard computer is probably around 100W or less, but professional workstations with multiple processors and hard drives can be more.
_________________________
http://www.hsiprodsvcs.com/

Top
#191850 - 01/15/10 10:34 PM Re: Wiring for office cubicles [Re: SJT]
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
One thing I'd ask is if the people will be allowed to have portable heaters. Some people can't live without them. There might be a copy machine that will need its own circuit too.

Bill

Top
#191856 - 01/16/10 11:12 AM Re: Wiring for office cubicles [Re: Bill Addiss]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
First & foremost IMHO, the following info should be available to the EC. Are cubicles 'new' or 'pre-owned'; equipped with factory' wiring harnesses? Or is the EC doing it from scratch?

Factory units must be wired to mfg instructions.

Otherwise, if it's a 'scratch' job, & the budget range of the job, 5 amps per ststion, 3 stations per 20 amp (derated); 4x20amp circuits would be my minimum.
Now...electric heat? 1 circuit each station! Toaster ovens? Don't laugh, I've been there!
_________________________
John

Top
#191857 - 01/16/10 11:16 AM Re: Wiring for office cubicles [Re: Bill Addiss]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
I think you better bump that 100w up a bit. The PC that I am typing on now is pulling a tad over 180w just sitting here and when the CPU really cranks up (IE editing a video file) it goes over 200. That is a 2.8gz single core computer, 15" LCD monitor, a switch and a router. Ink Jet printer idle.
Just for Gee whiz info the Kilawatt device says I used 459 KWH in 2516 hours.

That translates to at least 2 amps

If they are going to have a laser printer, add 10 amps.

What is the wiring method? If they have an under the floor raceway/duct system you have a chance to upgrade. Nobody ever got in long term trouble putting too much power into an office but sometimes it takes a few years to prove them right. Going for the minimum usually bites you in the butt fairly soon.
_________________________
Greg Fretwell

Top
#191859 - 01/16/10 11:47 AM Re: Wiring for office cubicles [Re: HotLine1]
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Originally Posted By: HotLine1
Now...electric heat? 1 circuit each station! Toaster ovens? Don't laugh, I've been there!
Don't forget Coffee maker(s)

smile
Bill

Top
#191861 - 01/16/10 12:14 PM Re: Wiring for office cubicles [Re: Bill Addiss]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5299
Loc: Blue Collar Country
The last pre-fab cubicles were arranged with three 20-amp circuits shared over five cubicles, if that's any help.

Top
#191871 - 01/16/10 09:07 PM Re: Wiring for office cubicles [Re: renosteinke]
SJT Offline
Member

Registered: 07/24/02
Posts: 242
Loc: PATCHOGUE, N.Y.
The cubicles were pre-wired with factory assemblies. They may be the 8 pin type. It was set up with 2 circuits, and they want a third circuit. Looks like the in house Electricians will have to open the existing outlets to find where the circuits originate from.
Good Weekend

Top
#191873 - 01/16/10 10:18 PM Re: Wiring for office cubicles [Re: SJT]
sparkyinak Offline
Member

Registered: 07/08/07
Posts: 1286
Loc: Alaska
Rule of thumb for general open office is 4 cubicals. If you suspect extra electrical loads like coffee makers, boot dryers and such, 3 per circuit.


Edited by sparkyinak (01/16/10 10:18 PM)
_________________________
"Live Awesome!" - Kevin Carosa

Top
#191874 - 01/16/10 10:56 PM Re: Wiring for office cubicles [Re: gfretwell]
noderaser Offline
Member

Registered: 03/01/07
Posts: 405
Loc: Portland, Oregon, United State...
Originally Posted By: gfretwell
I think you better bump that 100w up a bit. The PC that I am typing on now is pulling a tad over 180w just sitting here and when the CPU really cranks up (IE editing a video file) it goes over 200. That is a 2.8gz single core computer, 15" LCD monitor, a switch and a router.


Ok, let's say 200W... My two computers (one Mac Mini and one AthlonX2) and CRT draw 320W. Figure 60W on the CRT, 40-60W for the Mini and 200-220W on the Athlon. Could do more comprehensive tests, but that would require a shutdown.


Edited by noderaser (01/16/10 11:01 PM)
_________________________
http://www.hsiprodsvcs.com/

Top
Page 1 of 3 1 2 3 >



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