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UPS Manual Bypass

Dave mcn

Hi everyone

I have a customer that wants a manual bypass for their UPS

Currently there is nothing, the feed goes straight through the UPS and to a sprinkler pump via a control panel.

They have confirmed that they just want it for manually switching over to mains supply if the UPS fails.

The circuit isn't critical and can be interrupted to switch over to mains.

Their budget is tight as they are a charity.

I am thinking of just using a 3 position changeover switch. 

https://www.cef.co.uk/catalogue/products/1780467

Any thoughts please?

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    As Andy says, most commercial systems are interlocked to prevent paralleling the UPS and mains supply. As a minimum, you'll need an SOP to switch the UPS into bypass before operating the switch, again, more human factors to introduce. If it's a small UPS, <32A, and the system is not super critical, as suggested, why not fit plugs and isolators? So, have a plug/socket on both the input and output from the UPS, if the UPS failed, just isolate, disconnect the UPS entirely and plug back into normal mains. We've done that in the past on 6KVA single phase UPS'.  

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  • 0

    As Andy says, most commercial systems are interlocked to prevent paralleling the UPS and mains supply. As a minimum, you'll need an SOP to switch the UPS into bypass before operating the switch, again, more human factors to introduce. If it's a small UPS, <32A, and the system is not super critical, as suggested, why not fit plugs and isolators? So, have a plug/socket on both the input and output from the UPS, if the UPS failed, just isolate, disconnect the UPS entirely and plug back into normal mains. We've done that in the past on 6KVA single phase UPS'.  

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