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Caravan Park

Grobbyman
I have to replace 6 pitch boxes on a touring van caravan  site.

So six pitch boxes with 4 van hookup points per box, each hookup point protected by a 10A 30mA RCCB.

Unfortunately I've also discovered that the site is wired as a ring in 6mm SWA, buried direct in ground.


Any thoughts on max fuse size to protect a 6mm ring?


Regards

George
Parents
  • 0
    That endless trouble to achieve discrimination has been rather eroded since the introduction of MCBs.. 

    The trusty 13A fuses and B32 circuit breakers discriminate on overloads, not really on a dead short, and MCBs feeding submains to other MCBs such as supplies to garages and summer houses and so on are just as problematic

    Given the reliability issue with  RCDs - I bet you like me have found more than a few that do not actually trip at all when called upon to do so; I'm not that worried about cascaded RCDs, - I'd rather something tripped than nothing.  Right now they are required by the regs for  caravan supplies anyway, one on the campsite, one inside  the caravan itself..


    I suggest that there would  be scope for some finer stages of delay and rating than seem to be readily available - if not for caravans then the submain situation for flats etc would benefit from a 30mA fast at one end, and a 30mA , not quite so fast, but still safety of life, at the meter end, perhaps restoring some selectivity/discrimination.
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  • 0
    That endless trouble to achieve discrimination has been rather eroded since the introduction of MCBs.. 

    The trusty 13A fuses and B32 circuit breakers discriminate on overloads, not really on a dead short, and MCBs feeding submains to other MCBs such as supplies to garages and summer houses and so on are just as problematic

    Given the reliability issue with  RCDs - I bet you like me have found more than a few that do not actually trip at all when called upon to do so; I'm not that worried about cascaded RCDs, - I'd rather something tripped than nothing.  Right now they are required by the regs for  caravan supplies anyway, one on the campsite, one inside  the caravan itself..


    I suggest that there would  be scope for some finer stages of delay and rating than seem to be readily available - if not for caravans then the submain situation for flats etc would benefit from a 30mA fast at one end, and a 30mA , not quite so fast, but still safety of life, at the meter end, perhaps restoring some selectivity/discrimination.
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