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LP-SP pannel
Controlls walgreens signs and lights, contactors are inside
Keywords: Gear

LP-SP pannel

Controlls walgreens signs and lights, contactors are inside

ZedusaTempImage_zed20140627_223617_70p.jpg photo_4_zed20140707_155723_70p.jpg photo_4_zed20140707_155723_70p.jpg photo_4_zed20140707_155723_70p.jpg photo_4_zed20140707_155723_70p.jpg
File information
Filename:photo_4_zed20140707_155723_70p.jpg
Album name:A_lights / Electrical jobs
Keywords:Gear
Filesize:18 KiB
Date added:Jul 08, 2014
Dimensions:336 x 448 pixels
Displayed:132 times
Light Source:Unknown: 0
Make:Apple
Model:iPhone 4S
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=17796
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Comment 1 to 10 of 10
Page: 1

streetlight98   [Jul 08, 2014 at 07:45 PM]
Is this sort of like a circuit breaker?
joe_347V   [Jul 09, 2014 at 06:39 AM]
I'm guessing it's more like those group relay boxes for streetlights.
streetlight98   [Jul 09, 2014 at 02:32 PM]
How do those contactors work? My friend Marco said he had wired up a ballpark with like 500 1500W MH flood lights and they all ran of a simple little 15A toggle switch on the wall and he said he used contactors and the 15A wall switch controlled the contactor and the contactor controlled the lights. But how does this work and how does a 15A switch control hundreds of amps of power without literally melting down?
joe_347V   [Jul 09, 2014 at 04:29 PM]
A contactor is basically a relay that handles a high amount of current. In the ballpark, the 15A toggle switch switches the contactor which then switches the light. In this setup the toggle switch only handles the current used by the contactor coil. The current from the lights is handled by the contactor.

The group relay boxes work in a same way. The PC switches on the relay, which then switches on the lights.
streetlight98   [Jul 09, 2014 at 06:06 PM]
Hmm but where does that extra current come from? Like if the lights draw a total of 200 amps and the contactor can handle that, but how do the fixtures draw 200A if there's only 15A to begin with?
Antstar85   [Jul 09, 2014 at 10:40 PM]
Normally the coil would be wired by a simple 15 amp circuit. A Coil is a magnet and closes when voltage is applied. The toggle switch simply breaks that and causes the coil to open which then opens the contactor. The toggle switch may never see a half an amp. You can also wire photocells instead of a toggle switch and get the same action.
A_lights   [Jul 10, 2014 at 04:35 AM]
Had to replace one of the siemens contactors one of 3 contacts had failed for 6 lights in the front canopy of the store
streetlight98   [Jul 10, 2014 at 03:10 PM]
Hm this is interesting! Thanks for the info! Smile
GEsoftwhite100watts   [Jul 22, 2014 at 12:29 AM]
It's basically a relay...
joe_347V   [Jul 22, 2014 at 12:43 AM]
Its basicallly what I said...

Comment 1 to 10 of 10
Page: 1