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

Topic Options
Rate This Topic
#61955 - 02/06/06 02:44 PM lighting demand calc's
sparky 134 Offline
Member
Registered: 09/04/04
Posts: 91
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.
Top
Work Gear for Electricians and the Trades
#61956 - 02/06/06 04:25 PM Re: lighting demand calc's
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
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
Quote:
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
Top

Member Spotlight
Member Since: 02/23/13
Posts: 204
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 51 Guests and 9 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

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