ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Lock-down Thread
by Bill Addiss - 02/27/21 01:16 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 13 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Lighting Load #170224 10/29/07 08:38 PM
Joined: Oct 2002
Posts: 830
S
sparkync Offline OP
Member
I've got a question on my continuing education test that I can't seem to come up with any of the answers they have to choose from. They're asking for the lighting load on a particular circuit in one of the panels. I go to the circuit directory and it gives me the room numbers. All the rooms have florescent fixtures. I count up the wattage from the lighting fixture schedule, and nothing matches. I then find out in the code that you're not suppose to count the wattage of the lamps to come up with the load, but you're to take the ampere ratings of the lights. I take it that this is the rating on the ballast? Problem is in this test it does not specify the amperage of the ballast. If I just take 20 amp circuit X 120 volts that doesn't come up either. Any suggesions here or is it possible there is not a right answer, and this is just a "trick" question? I'm sure I'm missing something somewhere. Thanks for your input. Steve..

Work Gear for Electricians and the Trades
Re: Lighting Load [Re: sparkync] #170236 10/29/07 10:04 PM
Joined: Nov 2006
Posts: 348
I
ITO Offline
Member
Hmmm I thought lights were considered a continuous load...hint hint nudge nudge.


101° Rx = + /_\
Re: Lighting Load [Re: ITO] #170272 10/30/07 05:37 PM
Joined: Oct 2002
Posts: 830
S
sparkync Offline OP
Member
ITO, I wasn't very good in algebra frown

Re: Lighting Load [Re: sparkync] #170345 11/01/07 11:03 AM
Joined: Oct 2002
Posts: 830
S
sparkync Offline OP
Member
I found my mistake. I was missing a hall way that was included in my question. I talked to the one who made up the test and it seems that my understanding of 220-4b ( 99 code) is wrong or his is wrong. The correct answer for this questions was determined by adding total wattage of the lamps.

The question states:
What is the load on circuit 5 in panel LP-1? You then have to go to LP-1 to see what is on the circuit, which is flourescent lighting. Then go to the different fixture schedule to see what the bulb wattage in each of the fixtures is. Is this question and answer according to the code??


( 1999 code )
220-4b: For circuits supplying lighting units that have ballasts, transformers, or autotransformers, the computed load shall be based on the total ampere ratings of such units and not on the total watts of the lamps.

Re: Lighting Load [Re: sparkync] #170353 11/01/07 12:20 PM
Joined: Nov 2006
Posts: 348
I
ITO Offline
Member
I think in this situation you have to give an answer based on the available information.



101° Rx = + /_\

Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,535 Are you busy
209,427 Re: Forum
196,827 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3