Return to the Electrical Wiring Forum | Post a Follow-Up

 o
cable for fluorescent ballasts

Posted by ionized (My Page) on
Mon, Dec 31, 12 at 16:31

Is there a cable suited for remote connection of ballasts? I am considering connecting some luminaires that are only a few inches apart. They are single-lamp so I think I could save money by buying half the number of two-lamp ballasts if it can be done. I would rather avoid conduit since I have never worked with it.

Thanks for reading


Follow-Up Postings:

 o
RE: cable for fluorescent ballasts

No... but thanks for the chuckle!


 o
RE: cable for fluorescent ballasts

Yosemite has never run across cable that fits this use. Has anyone else? Remotely-mounted ballasts are part of my life every day, but I suspect that it is done in conduit in every case.


 o
RE: cable for fluorescent ballasts

These luminaries don't already have ballasts?


 o
RE: cable for fluorescent ballasts

If these luminaries are self-contained fluorescent lamp fixtures, the ballast is mounted within the metal fixture and is already properly grounded to the fixture.

The fixture's lamp reflector is also grounded to the ballast and, most importantly, the incoming AC ground, which plays a very important role in striking the arc through lamp through the capacitance between the lamp and reflector and ionizing the mercury vapor gas.

The ballast's secondary wiring length is also figured into the equation. The secondary wiring size, length, and temp rating are also part of the UL listing and changes to it would obviously negate any UL listing if this is a concern or requirement.

If these are some other type of luminaries, then there may be exceptions to all this but the mfg should provide the requirements in a data sheet.

I apologize if I made assumptions as to what you are attempting to do - but I really did think your post was somewhat tongue-in-cheek.


 o
RE: cable for fluorescent ballasts

Watch out for voltage ratings also.

Striking voltages are rather high (even though of limited current).


 o
RE: cable for fluorescent ballasts

Sorry about the "luminaries" thing. I think that I had a spel checker problem with an application that does not have luminaires in its dictionary.

No, it was not a tongue-in-cheek question. I wish it was :-( I dunno why two, single-ballast luminaires were installed right next to each other. If I have to buy two replacement ballasts, it will almost certainly be less expensive to just replace them with two-lamp luminaires. They are just strips and recessed so they don't have to be fancy. I am talking about 8 lamps here so it is not a really big deal. I just like to do things on the best practical budget.

Any grounding issue should be solved by the ground conductor run from one luminaire to the adjacent one. I doubt that I will do this with conduit though I happen to have the tools and materials lying around. I really don't know what I am doing with them.

FYI, the GE electronic, programmed-start ballasts that I have on hand have 18 ft. remote mounting limits with 18 AWG wire. Some are 1-2 lamp and some are 3-4 lamp.

Thanks for all of your comments!


 o
RE: cable for fluorescent ballasts

"E electronic, programmed-start ballasts that I have on hand have 18 ft. remote mounting limits with 18 AWG wire."

Wire gauge is determined by current, insulation thickness by voltage.

Fixture wires are often VERY specific to the application.


 o
RE: cable for fluorescent ballasts

All this trouble to save $15 on a ballast? I would usually recommend that you just replace the entire fixture with a 2 lamp fixture, but that will cost more than $15.


 o
RE: cable for fluorescent ballasts

Think about it. If there were suitable cable and someone could steer me to it, I'd be there with a couple of cable clamps and a couple of feet of cable. That is not much trouble at all.


 o
RE: cable for fluorescent ballasts

If they are so close together, can you not just install a 1/2" nipple (chase, short, offset or otherwise) between the fixtures? If so, as long as the ballast wires are long enough to reach their corresponding tombstone leads, I don't see a problem.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here