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So regs say an immersion cable need not be protected by fuse or mcb? Foolish not to. It is foolish not to protect the immersion and cable.

Electrode boilers are used in industrial applications for raising steam - usually big items. Very efficient at a tad under 100%. There was a move to have one for domestic applications. Safety is the problem. Heat pumps make better economic sense for domestic applications for heating.

Electricity and water do not mix well.

The immersion is a spur off a ring with no spur cable protection, relying only on the 32A mcb in the CU.

I believe 433.1.103, Appendix 15, says 20A off a spur. Has that been superseded? flameport in answer to: 3) A fused spur from a ring supping a number of socket outlets, however instead of a fused connection unit, a 16A 60898 breaker in an DIN enclosure has been used. "3 - C3, no selectivity on...

Read back on the thread. What was put across, was put across clearly.

Yes, I will not be told, as it is not the correct solution. Why? because FCUs are hard to press switches which are not good for young and old hands. FCUs for light switches is not a good idea - a last resort. Interesting. That counters Sunray who says only 16A mcb on the spur cable. I fully...

I put the first post in a simple way to avoid this, but this being this forum, this is what you get. A lot of one liners as well, like "you don't know what you are doing" and "you are wrong" and "you are botcher", etc, with nothing explaining where I was wrong or what the preferred solution...

Six page so far, with about 4 of them noise.

Another one. <sigh> His value to the thread topic has been zero. More noise.

All you can do is put in the correct mcb type values. If they trip out of order than t may be the mcb which is at fault. I did complain to the builder (Taylor Woodrow) who did not want to know. They said it conforms to regs and is totally safe. I pointed out that the garage fuse is 16A which is...

I did actually split a ring into two radials with an explanation on how it was done. There is also a hypothetical garage spur off a ring, and the ideal way of doing it - this has created much confusion. But thanks to Sunray, again, that was sorted,

Of course - obvious. Draw 15A in the garage and 16A on the rest of the radial then the 20A in the main CU will trip.

You wind yourself up.

Of course you do. You are assuming I knew nothing about mcb types. Wrong assumption. Fulham

Of course it will. That is the case with all installations with one or two RCDs. The only way to ensure all faults or overloads are contained in the garage is not have the ring on an RCD or rcbo, having the garage circuits on RCBOs/RCD. But the house is then less protected, which is undesirable.

An mcb's prime function is to check current overload. The 16A mcb will trip before the 20A. But this was to make a poor job better, but not the ideal (which is the garage cable back to the CU). The setup was far better than what was before, for sure.

You wrote: "With your setup a problem in the garage will almost certainly trip both the garage 16A MCB and the house 20A one". If there is a load on the garage radial of 18A the 20A mcb in the main CU will not trip (unless it is faulty). The 16A mcb in the garage will.

Electrically there was nothing wrong with what he sort of proposed. Give us your take on the 4mm.

I am? new to me. House ring did not have heavy appliances. TV, computer, etc. splitting the ring into two radials gave a much better setup than what was there for sure.