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Hi There Does anyone know why there should be no more than a 1% volts drop on the DC cable from the array to the inverter ? And what affect on the system a higher volts drop of say 3 % may have ? Cheers

Hi I have read this thread = //www.diynot.com/wiki/electrics:speclcn:supbond17th It says that sup bonding may be omitted if 3 things are met , the 3rd been if = ■All extraneous conductive parts in the location are effectively connected to the protective equipotential bonding...

Hi There I have been asked if i can wire so as to shut off the power to a socket circuit when the fire alarm goes off . I am thinking to do this by installing a contactor next to the DB and switch it from the fire alarm panel . I know that the panel has a normally closed circuit in it...

Hi can anyone help please ?? I have to bury a cable under the ground to feed a lamppost i am installing . I have to cross a grass verge , a tarmac foot path and also part of a car park . I have found out that i need to put the SWA cable i am using within an orange ducting and place a...

Hi There Can anyone pleses tell me the required lighting LUX levels for car parks in the UK . I have looked in to this but keep coming up with differnt answers . Is there an exact answer/regulation somewhere ? Cheers

Hi all I am trying to find out the correct way to fully test a ring circuit installed in metal conduit , which uses the conduit as the CPC (earth) . I do know how to test a 2 core and earth ring circuit correctly , but i am unsure how to carry out the required tests , and what boxes to...