by sparx »
Sun Jun 17, 2007 5:59 pm
Hi max length of tails 4mtrs. To go further you must fit an isolator sw. within 4 mtrs of meter box & run a 'sub-main' to consumer unit, no limit on length then.
Running double insulated cable between joists should be OK as long as usual bldg regs routing adhered to, always did go in cavity but not advised now , your part P approved electrician will know local situation,
as you can't DIY this work,
regards SPARX