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Powering a 347 Volt SOX ballast (1)

Powering a 347 Volt SOX ballast (1)

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120 to 347 volts step-up transformers are rare. 347 to 240 or 120 volts are commonly cheap. I used the step-DOWN transformer in reverse to get the LPS 347 volt ballast to work. Since the OCV is 660v, the 135w SOX lamp worked correctly going through what appeared to be normal powerup.

IMG_96712BIMG_9667.jpg IMG_96682BIMG_9669.jpg IMG_3202.jpg IMG_3613.jpg

Light Information

Light Information

Manufacturer:Sola Canada
Model Reference:75-17-1419
Lamp
Lamp Type:SOX
Fixture
Fixture Type:Alpha 4 luminaire
Ballast Type:magnetic auto-lag L73/L74
Electrical
Wattage:135 watts (lamp), 180w consumption
Voltage:347 V only
Current:0.65 A

File information

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Album name:lights*plus / SOX or LPS testing
Keywords:Gear
File Size:1530 KB
Date added:Nov 10, 2019
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Globe Collector
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Aug 27, 2020 at 12:20 AM Author: Globe Collector
What was the lamp current? Should be 600mA.

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Aug 27, 2020 at 01:30 AM Author: lights*plus
Hmm yea, I could measure the lamp current since it's a magnetic ballast. Next time, when I put up these silly 347 volt single-tap ballasts on ebay.
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Aug 27, 2020 at 01:50 AM Author: Globe Collector
Easy method if you don't have a clamp-meter, cut one lead to the lamp (the one with the potential nearest to ground or neutral) and place a 1 Ohm 5 watt resistor in it. Use your multimeter (onj AC volts) to measure the drop across the 1 Ohm resistor which should be 600mV.

Manufactured articles should be made to be used, not made to be sold!

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Aug 27, 2020 at 03:14 AM Author: trojmiejski
As SOX are very rare where I live I don't know much about all the possible gear configurations. Why a 347V ballast was made at all as this is unusually high voltage? After visiting UK and uploading photos I was informed that a common practice was to use gear outside of fixtures themselves as old transformers were heavy so due to weight it was better to place them at the base of the pole. So do I think correctly that apart from SOX transformers with ballasts integrated there were also configurations with separate step-up transformer outside the fixture and such small ballast inside it?
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Aug 27, 2020 at 08:01 AM Author: Bulbman256
Looks like with a bit of custom work you could fit the step up transformer inside the fixture and add a 120v cord to it and have a nice display piece.

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Aug 27, 2020 at 09:06 AM Author: LightsDelight
What is 347V used in? Had never heard of it before?

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Aug 27, 2020 at 09:20 AM Author: Bulbman256

What is 347V used in? Had never heard of it before?


It is Canada's high voltage standard so 347/600v for it instead of 277/480v. Really hard to find ballast that use both though.

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Aug 27, 2020 at 09:24 AM Author: LightsDelight

It is Canada's high voltage standard so 347/600v for it instead of 277/480v. Really hard to find ballast that use both though.

Oh right. I have heard of 120, 208, 240, 277 and 480. This sorta solidifies my claim that the North American power system is strange . All we have is 240 and 415V three phase, we barely ever use 3 phase loads for massive motors like in lathes of milling machines

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Aug 27, 2020 at 05:10 PM Author: trojmiejski
Same in Europe, here phase to neutral ranged from 220V to 240V and interphase from 380V to 415V. For lighting purposes interphase is used only for HID lighting with 2kW wattage and above (exceptionally there were also some 1kW lamps like here https://www.lighting-gallery.net/gallery/displayimage.php?album=2798&pos=251&pid=111564 but most 1kW MV lamps were designed to operate on 220V) and for F96T12 VHO installations. Once experimentally such lamp was also made: https://www.lighting-gallery.net/gallery/displayimage.php?album=2480&pos=45&pid=70036
I don't think that interphase was ever mentioned in case of SOX though I could be wrong. Generally SOX in Europe is powered from 220V-240V and higher wattage SOX lamps use individual step-up transformers.
Overall many things typical for US are rare or absent in Europe. For example center tapped transformers are common in the US but in Europe are used only in unusual applications like the transformer with center tapped primary winding used in weird DC to AC converter for fluorescent lighting in West German railway carriages.
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Dec 22, 2020 at 05:56 PM Author: sox35
Shouldn't current on a 135W SOX lamp be 0.9A..? It is on all the systems used here.

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Dec 22, 2020 at 10:36 PM Author: lights*plus
That's right. It's supposed to be 0.9 amps, and since the lamp socket is only wired to its dedicated SOX ballast, it should be spot on even though the ballast gets 329 volts in. Will confirm soon though.
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Dec 22, 2020 at 11:12 PM Author: lights*plus
I glanced at the 75-17-1419 Sola ballast and the 0.65A (listed in the image info above) is the draw at 347 volts not the lamp current.

Typical draw for a multi-tap 135/180 SOX ballast here in North America:
-------- 135w - 180w
120V = 1.55A - 1.78A
240V = 0.80A - 0.88A
277V = 0.68A - 0.75A
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Jan 04, 2021 at 02:46 PM Author: F20T12
SMART!!!!!!

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Jan 04, 2021 at 02:54 PM Author: lights*plus
I retested this setup and the one with another multi-tap ballast (but different 175w M-H ballast, new pictures coming soon). The 347w SOLA ballast supplies 0.9A to the lamp. So this method is definitely safe for the 135w SOX lamp.
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Jan 04, 2021 at 08:29 PM Author: BG101
Interesting .. but what is the off-load current draw of the transformer wired this way? Should be very minimal.

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Jan 04, 2021 at 10:41 PM Author: lights*plus
Off-Load current for the 347 volt ballast? Would that be between the transformer and the 347 volt ballast? I'll measure this again as I'd also like to see the Watts & Amps drawn. Might be an inefficient method, keeping in mind that any 120volt magnetic ballast for the 135w SOX lamp should draw around 180watts.
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