P - check out here:
http://www.diynot.com/pages/el/el004.php
There are some other issues around running the cable thorugh insulation etc (i.e. so that heat cannot dissipate) but for 7x120=840W then that's sufficiently below the 3.6kW rating for 1.5mm2 that you'll be fine.
Posted : 23/11/2013 4:45 pm
Topic starter
Cheers Stoner.
Posted : 23/11/2013 4:59 pm

