Went to relocate an existing 10.5Kw shower last week, And discovered that the 10mm2 T&E cable had been jointed with a 30a joint box under the floorboards, This shower takes about 45a, So was well over the top for the jointbox, The shower was supplied from a 50a MCB/30ma RCD,
The jointbox had been in service for over 5 years, and showed no signs of heat damage or arching,
The reason is jointbox terminals do not carry the actual load current,
But merely compress two overlapping conductors together, So why is the jointbox rated at 30a? When it could probably carry 80a, or more,
Obviously the physical size of the terminals denotes maximum csa of conductors, But this did not stop the previous installer from jointing the cable,
I obviously replaced the entire length of cable,
Would love to hear your opinions on this subject,
The jointbox had been in service for over 5 years, and showed no signs of heat damage or arching,
The reason is jointbox terminals do not carry the actual load current,
But merely compress two overlapping conductors together, So why is the jointbox rated at 30a? When it could probably carry 80a, or more,
Obviously the physical size of the terminals denotes maximum csa of conductors, But this did not stop the previous installer from jointing the cable,
I obviously replaced the entire length of cable,
Would love to hear your opinions on this subject,