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Not sure how to use this

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I was clearing out the attic the other day and I came across what looks like a very big battery. It looks fairly simple to use, but I would like to see what people make of it and how I should use it (safely). It has a mains (UK) socket on one side and what must be a charging wire on the other side. The charging wire is not attached to a plug, just the bare wires (brown, green/yellow, blue). There is also some info on the top:

TRANSFORMER

TO BRITISH STANDARD 171: 1959

kVA: 0.75 FREQUENCY: 50
PRIM. VOLTS: 240 VEC. GRP.: 71
SEC. VOLTS: 240
SEC. AMPS: 3 PHASES: 1
IMP. VOLTS: (blank) SERIAL NO.: 193429

Some pics:
https://imageshack.us/photo/my-images/850/imag0331h.jpg/
https://imageshack.us/photo/my-images/685/imag0332rt.jpg/
https://imageshack.us/photo/my-images/59/imag0333i.jpg/
https://imageshack.us/photo/my-images/861/imag0334e.jpg/

I’m assuming this is some kind of back-up battery in case of a mains failure? If so, I would like to use it. I assume that I can charge it by connecting the wires up to a plug and supplying mains to it. But how can I tell when the battery is fully charged? Will I damage it if I leave it charging too long?

Also, there is no info about how big the battery is (i.e. Ah), anyone care to estimate based on the pictures?

Thanks for any help :)
 
Unfortunately from work I can't access Image Shack or sites like it. I wish you would have just uploaded the images to this site rather than link elsewhere.

What you describe is a transformer. A 750 VA isolation transformer with a 240 volt primary and secondary (1 to 1 ratio). How are you getting battery out of any of this?

Ron
 
hi,
Saw the images, its a 3ph mains 240Vac isolation transformer.

The three bare wires Bn,Bl,Gn are the input , ,, batteries not included
 
Thanks guys, I hate it when at work and my Net Nanny says no. :) I guess I should be happy as the Net Nanny at least allows me to get to ETO.

You guys sure it is 3 pphase because the posted name plate data said:

SEC. AMPS: 3 PHASES: 1


The 3 Amps makes sense for a 240 volt 750 VA unit but I see single phase?

Ron
 
hi Ron,
Misread the image, the phase label is blank, I linked it with the Amps at 3A.

Its a single phase 240V 1:1 isolation transformer.
You often see those on building sites for power tool use, H&SE etc.

Eric
 
Last edited:
hi Ron,
Misread the image, the phase label is blank, I linked it with the Amps at 3A.

Its a single phase 240V 1:1 isolation transformer.
You often see those on building sites for power tool use, H&SE etc.

Not really, building site ones are 110V - you aren't allowed to use 240V tools.
 
hi Nigel.
Maybe in your day, but not for us really old guys.:)

British Steel were 50Vac for all portable appliances, including the electric kettle, which had a cable as thick as your wrist.:eek:

The mains plugs were something else!!!
 
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