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    Measuring Zs

    Hi When measuring maximum earth fault loop impendance Zs on a light circuit, do you measure on a 3 plate pendant between loop and earth or live and earth Thanks for you assistance.
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    Unswitched Fuse

    Thanks very much johnney
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    Unswitched Fuse

    Hi johnney The ring is RCD protected, there is no supplementary bonding in the bathroom as it is all plastic pipework. The only bonding is 10mm from the CCU to the gas and one the water main, which is approx 500mm of copper pipe at the entry point and then after all plastic pipework. The...
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    Unswitched Fuse

    Is it possible to have a High level unswitched fuse as a connection for a radiant heater in the bathroom off of the ring main
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    Drilling zones in "I Joist"

    Can anyone please tell me if the drilling zone through an I Joist is the same as the zone through a standard timber joist ie: 0.25 - 0.40, as I Joist have knock out holes all throughout its length. Thanks for your assistance.
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