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thank u for ur replies...lol left college about a year ago now but not been working in the trade that regular. I get 45 metres at 1200 watts but surely that cant be right as lighting circuits do probably exceed 45 metres in the real world ?? i changed the options to 25 degrees for ambient temp...

hello could somebody please help me...I i was wondering what the maximum length for a lighting circuit wired in 1.5mm sq cable protected by a 6 amp mcb...also the maximun length of a ring final circuit wired in 2.5mm sq protected by a 32 amp mcb. A ring may serve up to 100 m sq of floor area...