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ARE WE THE MEAT IN THE SANDWICH?

John Peckham
I know I am old grumpy and cynical as my wife tells me that every day! 


However am I right in thinking that BS 7671 and LV installation design requirements are having to compensate for problems in the DNO supplies to building and at the other end poor quality appliances. It appears to me we are having to compensate for other people's failings.


For example having to compensate for DNOs not maintaining their supplies in good working order, I am thinking hear about PEN failures, although their is a statutory duty (ESQCR) to do so. At the other end poor quality appliances susceptible  to transients, counterfieght goods from the Far East and generally not fit for purpose e.g a certain make of fridge freezers, washing machines and tumble driers.


Surely us LV piggy in the middle has become the meat in the sandwich?


Discuss? 


JP


PS where has the smell checker function gone on this forum?
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  • 0
    My understanding is that end-user equipment is supposed to be able to handle transients up to 1.5kV,  while the fixed wiring is supposed to be able to handle up to 4kV (and the meter + cut out 6kV). So it's the job of the fixed wiring to reduce transients from 4kV to 1.5kV before it reaches the equipment. It seems reasonable to me that, in areas prone to transients, you spend £100 on an SPD at the CU to achieve this rather than have to engineer every little GU10 LED lamp, phone + USB charger etc to handle 4kV rather than 1.5kV.
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  • 0
    My understanding is that end-user equipment is supposed to be able to handle transients up to 1.5kV,  while the fixed wiring is supposed to be able to handle up to 4kV (and the meter + cut out 6kV). So it's the job of the fixed wiring to reduce transients from 4kV to 1.5kV before it reaches the equipment. It seems reasonable to me that, in areas prone to transients, you spend £100 on an SPD at the CU to achieve this rather than have to engineer every little GU10 LED lamp, phone + USB charger etc to handle 4kV rather than 1.5kV.
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