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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Here is the NEC standard that looks applicable in this situation to me posted by Tweaker456 on July 27, 2017 at 10:30:05:
https://www.audioasylum.com/audio/tweaks/messages/20/204476.html
But that is for transformers that fall under the jurisdiction of NEC. Not necessarily for cord and plug connected power supplies for audio and or video equipment. I think for overcuurent protection in this case it would be more under UL, NEMA, or some other safety equipment standards.
Where you see the 2 amps or less being 300% somewhere deeper in the code, that 300% figure is meant more for the overcurrent protection of control transformers not a small transformer used for power.
Control transformers are used in appliances and equipment to operate control devices that switch on and off larger power devices. Example a gas fired furnace found in a home. It will use a step down 120V to 24V control transformer to supply the power for the various control circuits. One being to start and stop the blower fan. (Note: Normally small VA rated transformers, say 25VA or so, will have built in fuse protection)
In commercial buildings and industrial facilities control transformers are found in all kinds of equipment. Example, motor control centers, Automated lighting switching equipment. Simple thing as an automatic door opener when you walk into a store.
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Follow Ups
- I furnished that info already in an earlier post. - jea48 12:42:37 07/27/17 (7)
- UL code - Tweaker456 13:59:46 07/27/17 (2)
- RE: UL code - jea48 15:08:14 07/27/17 (1)
- RE: UL code - Tweaker456 16:03:42 07/27/17 (0)
- If this is correct there is no statement that it applies only to control tranies - Tweaker456 13:44:53 07/27/17 (1)
- RE: If this is correct there is no statement that it applies only to control tranies - jea48 15:01:53 07/27/17 (0)
- RE: I furnished that info already in an earlier post. - Tweaker456 13:30:50 07/27/17 (1)
- RE: I furnished that info already in an earlier post. - jea48 14:46:18 07/27/17 (0)
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