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#214714 - 01/14/15 05:05 PM fluorescent disconnects
triple Offline
Member

Registered: 04/01/02
Posts: 182
Loc: Wisconsin
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?

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#214718 - 01/15/15 12:05 AM Re: fluorescent disconnects [Re: triple]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9012
Loc: Estero,Fl,usa
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.
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#214721 - 01/15/15 07:39 AM Re: fluorescent disconnects [Re: triple]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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.
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#214724 - 01/15/15 08:42 PM Re: fluorescent disconnects [Re: HotLine1]
electure Offline

Member

Registered: 12/24/00
Posts: 4225
Loc: Fullerton, CA USA
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.

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#214728 - 01/16/15 09:52 AM Re: fluorescent disconnects [Re: triple]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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.
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#214736 - 01/17/15 01:00 PM Re: fluorescent disconnects [Re: triple]
geoff in UK Offline
Member

Registered: 12/30/02
Posts: 169
Loc: UK
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.

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#214798 - 01/24/15 10:56 PM Re: fluorescent disconnects [Re: electure]
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
Isn't that (ballast) scheme effectively banned by Congress?

I haven't seen those in years and years.
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#214804 - 01/25/15 01:18 PM Re: fluorescent disconnects [Re: triple]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6785
Loc: Brick, NJ USA
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.
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#214813 - 01/26/15 12:03 PM Re: fluorescent disconnects [Re: triple]
ghost307 Offline
Member

Registered: 05/09/05
Posts: 876
Loc: Chicago Illinois USA
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.
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