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Wiring advice for small single phase lathe in home workshop

Alan B

I am being asked to wire up a small single phase lathe in a home workshop.

I will be using an NVR switch for start and stop, with a 0.55kw motor looks like I should have overload protection as well (552.1.2)

The customer has an old forward/reverse switch, my guess is 30 years old with metal case , but looks in good condition. My specific concern is that the switch has a leaver to rotate it and a center off position, it could easily be used to switch the motor off and then knocked on.The customer is quite safety conscious so fairly unlikely to happen, but I am wondering if this is normal or is there an alternative arrangement used? Just realised I my have to change the switch anyway as it's not ip rated, but still not sure what to use.

Tried to attach some pictures but cant work out how to do it? 

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  • 0

    This is machinery as defined in the Supply of Machinery (Safety) Regulations. From the point of connection with the mains (plug, or cable into the main switch or controls), it is wholly outside the scope of BS 7671.

    The design of the machinery is outside BS 7671, however, its selection (in terms of complying with appropriate standards if it's hard-wired) is within BS 7671. Since you can't determine that this Machinery complies with the relevant standards because of its age, I would say it's one of those 'departures' times if you want to wire it up... although perhaps a solution is to fix a socket-outlet, and suggest the customer connects the equipment themselves?

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    This is machinery as defined in the Supply of Machinery (Safety) Regulations. From the point of connection with the mains (plug, or cable into the main switch or controls), it is wholly outside the scope of BS 7671.

    The design of the machinery is outside BS 7671, however, its selection (in terms of complying with appropriate standards if it's hard-wired) is within BS 7671. Since you can't determine that this Machinery complies with the relevant standards because of its age, I would say it's one of those 'departures' times if you want to wire it up... although perhaps a solution is to fix a socket-outlet, and suggest the customer connects the equipment themselves?

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  • 0 in reply to gkenyon

    Apologies, also in the above, I meant to mention something specific.

    Alan B said:
    The customer has an old forward/reverse switch, my guess is 30 years old with metal case , but looks in good condition. My specific concern is that the switch has a leaver to rotate it and a center off position, it could easily be used to switch the motor off and then knocked on.

    So, the main reasoning for mentioning the fact that BS 7671 isn't the standard, is that replacing this switch would not be covered in BS 7671 - out of scope - and other standards, including BS EN 60204-1 and BS EN 60073, plus other attendant standards, would have to be considered. Which causes a plethora of issues, potentially, with older equipment.

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