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
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 259 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#61955 - 02/06/06 02:44 PM lighting demand calc's
sparky 134 Offline

Registered: 09/04/04
Posts: 92
Loc: Joliet, Il, USA
I don't have a lot of experience with engineering so I am looking for a little help with figuring the lighting demand.
Here are the specs:

119-50watt incadescent lamps
21 -2x4 3lamp lay-ins, 3lamp T-8
23 -flourescent track heads, 2 lamps each

All of the lighting is 120v. The panel is 3phase.

From what I understand, a power factor has to be figured in for the fluorescent portion of the load.

Thanks for any help.

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....

#61956 - 02/06/06 04:25 PM Re: lighting demand calc's
e57 Offline

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
A lot really depends on the use of the space, and what the lighting is. Most of that can be done by VA/sq'. See 220.3(A) through (C), 220.10 through 12 may also be applicable, and there is an example in Annex D-3.

This is a portion of the FPN on 220.10
See 220.4(B) for the maximum load in amperes permitted for lighting units operating at less than 100 percent power factor.

Happy number crunching....
Mark Heller
"Well - I oughta....." -Jackie Gleason


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