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British Standard Motors

British Standard Motors

British Standard Motors


We have some old BRitish Standard Ac Motors and I’m looking for information to allow me to plan on changing them to IEC Motors. I asked locally for the drawings but they did not have anything on them. I would appreciate and drawings or information you can share with me to help with this. I’m thinking the mechanical aspect will be slightly different been imperial but I’m not sure how different, maybe the frame sizes are similar but any help would be appreciated



RE: British Standard Motors

Most British motors from the early 1970's onward were built to the metric IEC60072 standard dimensions which prevail today. Prior to that they were probably built to BS2960, which was published in 1958, or to BS2083 which was published in 1953.

I might be able to get access to the older standards in the works collection, but obviously I can't upload them - what specifically are you looking for?

RE: British Standard Motors

Hi ScottyUK,

Thanks for the reply, these motors are probably from 1975 on. Some are the brand Nash and are unusual looking but I have not checked the dimensions. I was hoping for general drawing to cross check vs IEC but if you say they are the same then it may not be as difficult as I thought. Just one thing, I think the Nash may be Canadian or from the USA typically would they have followed the same if they were built to the BS std of the day and could you give me the BS no from that era.


RE: British Standard Motors

Nash... would that be a liquid ring vacuum pump perhaps? Any chance of a photo of the motor and a close-up of the maker's plate? My guess based on the age is that they're either IEC frames, or you've got a North American NEMA motor.

Our plant is full of motors from that era and they're all metric frames apart from the occasional oddity from across the pond. The latter are a pain in the arse because it's impossible rather difficult to buy a replacement NEMA type with ATEX certification, unless it's a GE motor in which case it is literally impossible to buy one.

RE: British Standard Motors

No it’s a centrifugal pump with a foot mounted motor and coupling some of the motors are AEG but quite a lot are supposed to be Nash but they may not be. Reason I can’t say for sure is the plates are corroded so bad they are nearly gone to power and there is nothing visible. We have a plant log which we are pretty sure is right but it gives very basic information in hand written format and it mentions Nash

RE: British Standard Motors

Nash is likely the pump brand and not the not the motor builder.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: British Standard Motors

We have a huge population of Brook and AEG machines from that era. All are British-built with metric frames. They generally look big for their frame size, compared to, say, a modern Brook W-Series of equivalent frame and output. The heavy cast fan cowls and large fins contribute to this impression of size, but they still match the IEC dimensions.

I'll see what drawings I have at work and upload them.

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