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iam renovating my property in bulgaria and have noticed that the bulgarian wiring system on a ring main is 2.5 earth .phaze and nutural , iam wondering why do we have 1.5 cable on our earthing system as there cable will surely change my readings,

Hi Just moved over to bulgaria from uk ,have problem with my C H system, its a diesel system( which i havent come across before) with a header tank, problem being the expansion pipe is running hot water back into the header for 5 to 10 mins at a time,the expansion pipe is fitted before the...