Author Topic: CWI and CWA ballasts  (Read 5350 times)
Foxtronix
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CWI and CWA ballasts « on: December 05, 2008, 11:32:33 AM » Author: Foxtronix
Are there differences between both? I know CWA is for Constant Wattage Autotransformer, but I don't know that does CWI mean...
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form109
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Re: CWI and CWA ballasts « Reply #1 on: December 06, 2008, 04:03:04 PM » Author: form109
CWI means Constant Wattage Isolated,the design is very similar to a CWA Ballast except the secondary coil is electrically isolated from the primary coil.
« Last Edit: December 06, 2008, 04:05:01 PM by form109 » Logged
Foxtronix
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Re: CWI and CWA ballasts « Reply #2 on: December 06, 2008, 04:16:10 PM » Author: Foxtronix
Yeah I found the answer in the Advance Trasnsformers website just after posting my question. Anyway thanks!
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Medved
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Re: CWI and CWA ballasts « Reply #3 on: March 07, 2009, 03:01:01 PM » Author: Medved
Due to isolation, the CWI uses more wiring, so has higher losses and/or is larger and heavier.
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Re: CWI and CWA ballasts « Reply #4 on: March 08, 2009, 10:10:58 PM » Author: icefoglights
Due to isolation, the CWI uses more wiring, so has higher losses and/or is larger and heavier.

...and more $$$
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Foxtronix
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Re: CWI and CWA ballasts « Reply #5 on: March 10, 2009, 07:34:17 AM » Author: Foxtronix
I think CWI ballasts are the standard for high voltages such as 480V.
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Medved
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Re: CWI and CWA ballasts « Reply #6 on: March 29, 2009, 12:06:35 AM » Author: Medved
I think CWI ballasts are the standard for high voltages such as 480V.
The isolation allow grounded lamp shell, even if the input is connected between 2 phase - each of them is live respect to GND
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