ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
334.80 and fire caulk
by gfretwell. 06/21/18 11:35 AM
Calling all Non-US members!! (Non-US only)
by HotLine1. 06/13/18 01:50 PM
GE Lighting Recalls LED Tube Lamps
by Admin. 06/12/18 09:32 PM
Ketra Recalls Recessed Downlights
by Admin. 06/12/18 09:17 PM
diazed fuses
by Texas_Ranger. 06/11/18 07:31 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 20 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Pole light fuses #163155
05/02/07 06:42 PM
05/02/07 06:42 PM
D
drillman  Offline OP
Member
Joined: Mar 2003
Posts: 97
Somewhere in Texas
As some of you know from chat, I had to troubleshoot a string of pole lights that tripped the breaker due to one shorted ballast. Lots of shoe leather.

I have heard some people put fuses in the pole bases. Sounds good to me. Does anyone have any suggestions as to what type/class of fuse? Fast acting or time delay? And how to size? The current set up is 480 volt 1000w HPS fixtures. They are fed by a 20 amp double pole breaker.

Also I notice that bussmann makes "breakaway" holders for pole lights, at least that what their catalog says. Not sure what "breakaway" means exactly does anyone know?

My concern is of course coordination. This will not help if the breaker trips before the fuse.

Work Gear for Electricians and the Trades
Re: Pole light fuses [Re: drillman] #163157
05/02/07 08:41 PM
05/02/07 08:41 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,973
Brick, NJ USA
1k HPS ballast is 2.3 amps, & I can't remember if operating or starting current is higher.

Some locations have midget fuses in in-line fuse holders at the base; one set of poles has a fuse block (finger safe, Bussman) in the base.

My guess 3 amp, time delay.

A good place to get great info is Bussman.com; drop an e-mail to one of the fuseoligists.

John



John
Re: Pole light fuses [Re: HotLine1] #163159
05/02/07 08:55 PM
05/02/07 08:55 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,228
Estero,Fl,usa
I think I would start with FRN 5s. That is over double the running amps so nuisance popping shouldn't be a problem but one shorted ballast would still not overcome the breaker (16a per 20 design load)

BTW they also make indicating fuses/holders to really make troubleshooting easy.


Greg Fretwell
Re: Pole light fuses [Re: HotLine1] #163160
05/02/07 08:59 PM
05/02/07 08:59 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I would guess that 'breakaway' refers to something that would unplug when the pole is knocked over.

I think the Bussman in-line fuseholders I've been using are called "HEG." They use fuses such as KTK (fast acting) and FNQ (time delay).

I strongly recommend using time-delay type fuses, especially with HID lights.

The one drawback to the fuseholders is that it is difficult to get a good crimp. If the fixtures are not already wired with stranded wire, I suggest re-wiring them - or at least make pigtails.

Re: Pole light fuses [Re: renosteinke] #163172
05/03/07 06:03 AM
05/03/07 06:03 AM
J
jdo1942  Offline
Junior Member
Joined: Nov 2005
Posts: 31
st. louis, mo. usa
Many lighting companies install inline fuses for customers as part of the service. A 1000w 480vac fixture only needs a 4 or 5 amp fuse. The installation of fuse really helps the troubleshooting, if all the lights are parallel then fuses that control each pole blows when that light has a problem.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sbi
sbi
indiana
Posts: 47
Joined: March 2008
Show All Member Profiles 
Top Posters(30 Days)
twh 5
Admin 2
Popular Topics(Views)
247,718 Are you busy
185,037 Re: Forum
174,365 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 15 (0.005s) Memory: 0.9694 MB (Peak: 1.1089 MB) Zlib enabled. Server Time: 2018-06-25 13:46:28 UTC