A simple calculator to determine correct cable size and circuit breaker choice for final domestic circuits using copper conductors. As with all automation, check your answer.

All final circuits must be protected by RCD's

Iz=It Ca Cg Ci Cc.  Iz = Cable capacity (Amps) Ca = temperature correction Cg = grouping factor  Ci = cable surrounded by thermal insulation?  Cc = Rating for fuse protection.

Must be =< 11.5 v
If the conductor passes through insulation,choose the length of cable enclosed in insulation.
conductors grouped together.