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Using a UPS on mobile equipment

Andy May

Hi,

I have a client who requires the electrical installation to run a series of computers inside a fitted out van. The functional specification has stated the use of a UPS to feed the consumer unit. The supply to the van is via an on site plug and socket back the premises supply. My questions is how should I go about ensuring there is a path to earth for the protective devices if the connection to the site supply is lost (disconnected or cut through)?

Andy.

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    As I see it there are two distinct problems.

    1) The supply from which power is taken is poorly defined and may be off earth or reverse polarity, or indeed may fail completely without notice.

    2) The UPS may be designed to run all the time so that the mains is just filling the batteries, or only cut in when external supply fails.

    How many hours must the UPS work for. We have used mains conditioning modules in such cases that are in effect continuous running inverters but the batteries are only good for an hour or so.

    How big a load is all the kit in the van, and is the inverter NE bonded ?

    Mike.

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  • 0

    As I see it there are two distinct problems.

    1) The supply from which power is taken is poorly defined and may be off earth or reverse polarity, or indeed may fail completely without notice.

    2) The UPS may be designed to run all the time so that the mains is just filling the batteries, or only cut in when external supply fails.

    How many hours must the UPS work for. We have used mains conditioning modules in such cases that are in effect continuous running inverters but the batteries are only good for an hour or so.

    How big a load is all the kit in the van, and is the inverter NE bonded ?

    Mike.

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