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Unusual MCB

Sparkymania
Here's an interesting one.

Federal Electric 20A MCB. Had no type on it and was taking a long time to trip. Opened one up and discovered why it didn't have a type.

Others with it were ECC but virtually the same design. Only thermal. Both are plug in types called stab-lok and are bakerlite.


No instantaneous trip mechanism. Only a thermal one.



34200b5e07a12e120f5fc679b8b1b9aa-huge-mcb-with-no-instantanious-trip-mechanism-4.jpg
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    The 15th Edition required equipment to comply with the relevant requirements of the current edition of the applicable British Standard. So if these devices did not comply with BS 3871 or some other appropriate british standard, they ought not to have been used. Appendix 1 of the 15th Edition A1 1983 does not list a BS for RCDs but then BS4293 was not published until 1983. 

    Having looked back at my 15th Edition, how much more simple life was back then!
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    The 15th Edition required equipment to comply with the relevant requirements of the current edition of the applicable British Standard. So if these devices did not comply with BS 3871 or some other appropriate british standard, they ought not to have been used. Appendix 1 of the 15th Edition A1 1983 does not list a BS for RCDs but then BS4293 was not published until 1983. 

    Having looked back at my 15th Edition, how much more simple life was back then!
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