EN 61000-3-11 and EN 61000-3-12

I said to the other electrician that there's times I read manufacturer instructions and think "what the hell are they going on about?".

I think the issue about informing the DNO about showers and heaters above 9.0 kW is the increased maximum demand.

Is there a requirement for a low live neutral loop reading to avoid dimming the lights next door?

Is there a requirement for a low live neutral loop reading to avoid dimming the lights next door?

I think that's the general idea - I've seen requirements expressed in that sort of way for heat pumps - basically voltage drop but written the other way around (and possibly in a way that's easier to verify on-site).  I'd always presumed the issue with heat pumps and the like was the starting currents rather than rated demand (lights flickering every time the heat pump started up rather than continuous low voltage).

I would have thought that resistive heating elements would have had much less of an issue on that score though (OK the elements will have lower resistance when cold, so will have a somewhat higher 'starting current', but not that much surely?)

In any event the 0.031776Ω figure seems ridiculously low to me (unless I've completely understood what it means) - that would match a PFC of around 7.2kA and be impossible to meet in the vast majority of installations, especially domestic ones. I might suspect the Manufacturer has put the decimal point in the wrong place.

    - Andy.

Is there a requirement for a low live neutral loop reading to avoid dimming the lights next door?

I think that's the general idea - I've seen requirements expressed in that sort of way for heat pumps - basically voltage drop but written the other way around (and possibly in a way that's easier to verify on-site).  I'd always presumed the issue with heat pumps and the like was the starting currents rather than rated demand (lights flickering every time the heat pump started up rather than continuous low voltage).

I would have thought that resistive heating elements would have had much less of an issue on that score though (OK the elements will have lower resistance when cold, so will have a somewhat higher 'starting current', but not that much surely?)

In any event the 0.031776Ω figure seems ridiculously low to me (unless I've completely understood what it means) - that would match a PFC of around 7.2kA and be impossible to meet in the vast majority of installations, especially domestic ones. I might suspect the Manufacturer has put the decimal point in the wrong place.

    - Andy.