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Fire Alarm Panel Electrical Isolation.

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Is single pole electrical isolation suggested here even if we are going to prod and poke about inside the fire alarm panel? And, what are the two fuses removed mentioned all about? Is the lecturer confused?


Please see 41.12 onwards.

https://www.bing.com/videos/search?q=youtube+bs+5839+part+1&&view=detail&mid=92E9069FDA874942E42A92E9069FDA874942E42A&rvsmid=7BBC139314220094A9417BBC139314220094A941&FORM=VDQVAP


Z.
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    I presume single pole isolation, from the sparks perspective, is only OK when you have a solidly earthed neutral

    Perhaps better thought of as a solidly neutraled earth?


    N is earthed the same at the source on both TN-S and TT systems - yet we require DP isolation for TT but not TN - the distinction is rather whether PE is connected to N or not.


      - Andy.
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    I presume single pole isolation, from the sparks perspective, is only OK when you have a solidly earthed neutral

    Perhaps better thought of as a solidly neutraled earth?


    N is earthed the same at the source on both TN-S and TT systems - yet we require DP isolation for TT but not TN - the distinction is rather whether PE is connected to N or not.


      - Andy.
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