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The Value of R.C.D.s

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There have been many discussions recently about R.C.D.s, whether they really are necessary, and is an installation necessarily unsafe if it is old and has no, or insufficient, R.C.D. protection.

 

Well consider this please. If you are driving and need to brake hard to save somebody from injury or death does that incident ever get reported. If you knocked somebody over due to having bad vehicle brakes then it might.

 

If an R.C.D. operates correctly and saves somebody from injury or death, does that every get reported? There may have been 10s, 100s or even thousands of cases where an R.C.D. has saved somebody from injury or death, but we will never know the numbers because of a lack of reporting of the cases.

 

Personally I like the idea of R.C.D. protection

 

Z.

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    davezawadi (David Stone): 
     

    We have an installation without RCD. How do we code it? It seems that some want C1, perhaps C2. Is this correct, lack of additional protection is potentially dangerous? Are you sure, or does this go with a “what if”?

    I believe the current guidance from most providers of guidance (for TN-C-S and TN-S systems) is C2 or C3 (C2 in cases such as Bathroom, or where the socket-outlet is likely to be used for equipment outdoors, C3 otherwise). Can't be immediately dangerous as something else would have to be coded C1 already (failure of basic protection leading to access to exposed live conductors, for example). 

    Example: https://www.electricalsafetyfirst.org.uk/media/2149/bpg4-1.pdf

    Of course if it's TT, and loop impedances are too high for OCPDs to achieve disconnection times, this is also definitely a C2.

     

     

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  • 0

    davezawadi (David Stone): 
     

    We have an installation without RCD. How do we code it? It seems that some want C1, perhaps C2. Is this correct, lack of additional protection is potentially dangerous? Are you sure, or does this go with a “what if”?

    I believe the current guidance from most providers of guidance (for TN-C-S and TN-S systems) is C2 or C3 (C2 in cases such as Bathroom, or where the socket-outlet is likely to be used for equipment outdoors, C3 otherwise). Can't be immediately dangerous as something else would have to be coded C1 already (failure of basic protection leading to access to exposed live conductors, for example). 

    Example: https://www.electricalsafetyfirst.org.uk/media/2149/bpg4-1.pdf

    Of course if it's TT, and loop impedances are too high for OCPDs to achieve disconnection times, this is also definitely a C2.

     

     

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