The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Today at 02:39 AM
Photo Upload Tutorial
by DanK
Yesterday at 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 100 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#66646 - 06/10/06 07:56 PM Dim LV fixture
trobb Offline
Member

Registered: 06/08/06
Posts: 111
Loc: Iowa City, IA
I was at work today (over the summer I'm working at an ice cream store) and I noticed that the LV (MR16) fixture (an open bottom recessed can) over the waffle irons was giving only 10% (roughly) of it's normal light output. All the other fixtures on the switch and circuit are operating normally. Two questions result: could the steam given off by the waffle iron be affecting the output (perhaps shorting the HV leads on the transformer), and are there any suggestions on fixes for this problem? Thanks y'all.

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#66647 - 06/10/06 11:31 PM Re: Dim LV fixture
briselec Offline
Member

Registered: 12/28/05
Posts: 141
Loc: Brisbane, Australia
changing the lamp would be a good start.

Top
#66648 - 06/11/06 08:31 AM Re: Dim LV fixture
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Assuming thay a new bulb will also be just as dim.... then the problem is likely in the wiring.

Since it is just the one light, the best guess would be a bad splice or connection.

Low voltage lights are powered by transformers with very limited power output. Other causes of dim light(s) I have found have included:
-too much voltage drop, caused by too long of a wire;
-too many lights n the transformer; and,
-different circuits (some power supplies have more than one output circuit) interconnected.

Top
#66649 - 06/11/06 02:34 PM Re: Dim LV fixture
trobb Offline
Member

Registered: 06/08/06
Posts: 111
Loc: Iowa City, IA
Thanks for the help. I went to try and change the lamp this morning, and it turns out the (inline) connector between the lamp housing and the LV transformer was arcing (there is a lead of wires, then a connector, then more wire; no idea why). At least, that's my guess based on how the connector was showing visible signs of over-heating-- brown, crumbling, and slight distortion (one piece fell off in my hand as I went to break the connection). The connector will be replaced, but I want to figure out why this happened and how to prevent it from happening again. Not really necessary to keep replying, but I do appreciate you guys helping me figure out where to start.

Top
#66650 - 06/11/06 04:38 PM Re: Dim LV fixture
HLCbuild Offline
Member

Registered: 12/05/04
Posts: 206
Loc: Herndon,Va USA
I believe the connector is to make it easy to change the low-voltage socket. I usually keep 4 or 5 sockets with me as I find many problems with them. Seems the halogen lights burn real hot and when the connection gets weak, the wire fries.

Top
#66651 - 06/11/06 06:28 PM Re: Dim LV fixture
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
"why this happened and how to prevent it from happening again"

Tight - solid, and clean connections.

The amperage of the connections on the low voltage side of the transformer are 10X's what they are on the line voltage side. (.417 vs. 4.17) A loose connection will heat up, arching more and more over time and eventually fail.
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

Top
#66652 - 06/11/06 06:53 PM Re: Dim LV fixture
trobb Offline
Member

Registered: 06/08/06
Posts: 111
Loc: Iowa City, IA
That's the funny part-- the connector that failed was pre-installed in the fixture. Could be when it was installed we forgot to check internal connections, though (making a mental note for next time).

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals