ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Changing a Bulb
by gfretwell. 07/14/18 03:12 PM
Tray cable?
by gfretwell. 07/11/18 10:18 PM
Eaton Heavy Duty 30A and 60A Safety Switches
by Admin. 07/11/18 09:49 PM
ORTOVOX Recalls Avalanche Transceivers
by Admin. 07/11/18 09:44 PM
Tingle off the water spigot
by gfretwell. 07/08/18 12:58 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 9 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
LED tube wiring Disconnect required? #213358
04/15/14 02:38 PM
04/15/14 02:38 PM
R
rmiell  Offline OP
Member
Joined: Nov 2000
Posts: 242
La Junta, Co. USA
According to NEC 2014, Section 410.130(G)(1), fluorescent luminaires with ballasts are required to have a disconnecting means either internal or external to each luminaire.

How about when the ballast is unwired (or removed) in order to install self-driven LED tubes, in which the 120v (or 277v) branch circuit is wired directly to the socket on one end of the fixture?

Should this be a code requirement, or not?

I think this requirement was put in to address the changing out of ballasts, so you did not need to turn off the switch/breaker feeding the whole row of recessed trouffers. I think that there may be a need to disconnect the incoming power if a socket goes bad, but not necessarily when a tube goes bad, so the same thinking should apply.

Thoughts?

Rick Miell

2017 / 2014 NEC & Related Books and Study Guides
Re: LED tube wiring Disconnect required? [Re: rmiell] #213361
04/15/14 08:41 PM
04/15/14 08:41 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,985
Brick, NJ USA
In the 'old days'the ballast disconnect was either the cutter on a T-stripper, or opening a 'hot' splice.

The requirement for the quick disco on replacement ballasts, and new fixtures IMHO is a 'good idea'.

With the quickly changing LED items, the NEChas to play catch-up.



John
Re: LED tube wiring Disconnect required? [Re: rmiell] #213365
04/15/14 10:41 PM
04/15/14 10:41 PM
T
Tesla  Offline
Member
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
The irony is that the NEC is pressing the installation of disconnecting means at a time when it will be decades between service calls.

Too late!

IMHO, the Code should discourage 480VAC line to line voltages for illumination. 277VAC line to neutral ought to be the upper limit. This would reduce the size of any arcs.

Now that LED is sweeping the market, there is reduced need for watts.

Additionally, ganging contactor neutrals under one wire nut ought to be discouraged. Such lighting control cabinets should have isolated neutral bars, instead. Why?

It then becomes possible to un-circuit a contactor during production hours without hazarding ungrounded electronic ballasts. A broken return is brutal on electronics. It's a nasty shock risk for the service electrician. A cheesy isolated neutral rail is a trivial expense to stop the problem.

(I've seen control cabinets with no less than 12 neutrals in #12 stuffed into big blue wire nut pairs. With a jumper linking them. The amps were no biggie. The complications while the system was up and running ( a 24hr shop ) made it a nightmare.





Tesla
Re: LED tube wiring Disconnect required? [Re: rmiell] #213366
04/15/14 10:46 PM
04/15/14 10:46 PM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,242
Estero,Fl,usa
I would not be surprised if they did not extend this to any active component of a commercial luminaire. The LEDs may last longer than ballasts but they are likely to still be replaced hot.

This is where I would rather see NEMA step up and come up with a standard connector for ballasts or any other follow on technology.

I am not sure why it couldn't just be the good old 5-15, 6-15 and 7-15. Then you are voltage identifying and standard.


Greg Fretwell

Featured:

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

 

Member Spotlight
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Show All Member Profiles 
Top Posters(30 Days)
Admin 5
Popular Topics(Views)
248,109 Are you busy
185,564 Re: Forum
174,879 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 15 (0.004s) Memory: 0.9618 MB (Peak: 1.0948 MB) Zlib enabled. Server Time: 2018-07-18 06:37:16 UTC