second DB or not?

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heres the situation. building is about 60M by 15M. old DB is at front. last 15M of building are going to be small offices. there will be 2 lighting and 2 power circuits. question is, would it be better to add a second DB at the back for the offices or use the DB at the front (voltage drop over a ong length etc etc)?
 
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id add a submain from first DB, then probs 4 or 5 core SWA in 10/16mm

gunna nead clean earth or anything?
 
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securespark said:
Only two power circuits?
atm but there might be more at a later date which is why i was thinkin of a 2nd db
 

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