ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Any women electricians here?
by gfretwell - 01/17/22 01:44 PM
12 Lead Motor Connection Weird
by Elektrik - 01/12/22 11:09 PM
Well There's your problem.
by gfretwell - 01/08/22 12:17 AM
Happy New Year!!
by HotLine1 - 01/04/22 09:50 AM
Sangamo s309.2
by Robski - 12/31/21 04:54 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 51 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#214714 01/14/15 08:05 PM
Joined: Apr 2002
Posts: 189
T
triple Offline OP
Member
Why are lighting disconnects only required on fluorescent fixtures with double-ended tubes? There are other types of fluorescents as well as LED's that have ballasts/drives that will need servicing throughout their lifespan. If shutting off the light switch leaves the room in complete darkness, most will service these fixtures hot even without a disconnect. How can this be considered acceptable? What does a "double-ended lamp" have to do with anything?

Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Jul 2004
Posts: 9,677
Likes: 9
G
Member
It is an interesting question. Maybe a proposal is in order if you can make the case.
I think the low fruit on the original proposal was office buildings with long rows of tubes that typically get serviced while they are powered on.


Greg Fretwell
Joined: Apr 2002
Posts: 7,288
Likes: 4
Member
Over many years of 'maintenance' calls, I have to fess up that I replaced many ballasts 'hot'. Not much choice, most of the time.

Cut & cap the 'hot'; cut & cap the 'neutral'; cut the rest.

Yes, the disconnect is a nice requirement for safety.

If I remember correctly, some of the fixtures were wired thru the sockets, requiring a lamp 'in place' to make the feed to the ballast.



John
Joined: Dec 2000
Posts: 4,289
Member
Originally Posted by HotLine1

If I remember correctly, some of the fixtures were wired thru the sockets, requiring a lamp 'in place' to make the feed to the ballast.


I think you're talking about the F96, F72, and F60-T12 fixtures.

The bulbs had single pins that connected 2 contacts in the unsprung lampholders. The other end of the bulb had a spring in the lampholder.

The contacts were connected between the lines and the ballast.

Joined: Apr 2002
Posts: 7,288
Likes: 4
Member
That's it. Now it all comes back!

The removal of the lamps served the same purpose as the pull apart disconnect, IF the fixture was wired properly.





John
Joined: Dec 2002
Posts: 205
G
Member
Perhaps the thing about double ended types is that the pins on one end of the tube can be inserted whilst the free end can be touched. Indeed there is a temptation to touch the free end pins to check the horizontal alignment to ease fitting the first end.

Joined: Jun 2004
Posts: 1,273
T
Member
Isn't that (ballast) scheme effectively banned by Congress?

I haven't seen those in years and years.



Tesla
Joined: Apr 2002
Posts: 7,288
Likes: 4
Member
Tesla:
Could very well be! Although 'banned', there are still plenty in service.

'Remaining old stock', which is allowed to be sold/installed may also be available in some areas.

Geoff:
Yes, I remember using the bi-pins to orient the lamp to the socket.



John
Joined: May 2005
Posts: 984
Likes: 1
G
Member
I don't use the pins to check the alignment, but there are a couple of flattened spots where the metal end meets that glass that face straight down (or up) when the tube is rotated to the correct position that I use all the time.


Ghost307

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
Theelectrikid
Theelectrikid
Levittown, PA
Posts: 811
Joined: April 2004
Top Posters(30 Days)
NORCAL 3
grich 1
Popular Topics(Views)
287,879 Are you busy
220,049 Re: Forum
206,042 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5