Like this with a 12 kW electric flow boiler running at 53-amps on one of the RCDs along with other circuits and the PV feed in on the other, with the internal tails looping through the main switch outgoing terminals.

And if the P.V. electrons are fully used within the installation they will never flow through the main switch. It will be in at the 16 Amp M.C.B. along the busbar, then out to the loads on the final circuits. But if encouraged outside they may escape down the road to next door, via the main switch. But being home loving they may just stay put, especially if next door has its own P.V. system. Then there will be no encouragement to travel abroad for them. And all the local P.V. systems may raise the local supply Voltage to 253 Volts and start to get electronics in appliances hot.

Quote. "As each electrical grid is unique, and has different characteristics, the grid-tie inverter must also be adjusted to match the unique characteristics of the local grid. If the inverter is not designed correctly for the appropriate grid that it is connecting to, higher levels of voltage can overload the grid if there are enough systems connected."

Z.

Gentelmen, this thread has become very obtuse and lost any connection to the OP. Why are you worrying about 16A in a CU, or what way the internal manufacturers wiring is connected? Are we back on the scenario which is clearly beyond understanding, that exact ratings are not the important feature of Electrical systems, whereas diversity in all forms is. If you want to discuss CU design I suggest another thread. Multiple items on a circuit is just fine as long as we take note of the special features, and these are a case of engineering judgement. I am becoming very cross with the lack of understanding of anything important and the "I don't like the look of that" statements without reasonable cause, reasons or excuse.

So; another nail in the coffin of this forum regarding free speech.

"Intellectual freedom is essential to human society.......freedom for open-minded and unfearing debate and freedom from pressure by officialdom and prejudices." Andrei Sakharov.

Forum banner invitation.

Quote:

Wiring and the Regulations forum

Join the conversation

Discussions relating to electrical installation, electrical systems design, and related engineering topics including BS 7671 wiring regulations.

And related engineering topics eh?

Z.

Does that mean we should throw away the Wiring Regulations, and instead do a written risk assessment on each installation to justify why each circuit is safe?

It's simpler in the USA.  They have "code".  If your circuit isn't to code, it will fail an inspection.  Forget trying to justify why it's safe - if it's not to code then it must be fixed.

No we can not throw away the rule book. Perhaps we could have a simplified guide for learners and newcomers to the industry. It could be entitled an Onsite Guide.

Z.

How many electricians would run a circuit to a 16 amp EV charger using 1.5 mm twin and earth cable?

Depends upon the installation method.

in pyro, perhaps and perhaps TE on masonary  surface only but certainly not for route unknown including partition walls etc. Then 2.5mm looks more sense. A 16A EV requires about the same respect as an immersion heater. Both may be on for a time long cf the heating period of the cable and its immediate surroundings.

M

Apparently the correct answer is that whilst it may be permissible to use 1.5 mm twin and earth I will actually use 6.0 mm.