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No, I mean by reducing (ideally eliminating, but bonding conductors have resistance) the potential between different items within the "equipotential zone" during the fault.

A problem with a plain IT installation with no earthing/bonding is that the "first fault is free" but it's also silent. The second fault can be shocking.

In a TT installation, bonding reduces the touch voltage in the time between when a fault occours and when a RCD trips (which for distribution circuits could be several seconds).

That does look like a TN supply. At this point, I think you need to get it checked out by an electrician (or at least someone with the right test equipment).

AIUI kitchens were never "special locations" in the BS7671 sense. However, they were called out, along with "special locations" and "special installations" in the notification requirements that accompanied part P. These notification requirements have been superseded in england but are still...

We see this all too bloody often. Statements on test reports that don't make sense and look like they have been copy/pasted from somewhere, either manually or by the software that generated the report. The most obvious interpretation of that line would be that the EFLI is less than two ohms...

My understanding is that there are basically two sorts of hydro. "Conventional hydro". Water is stored behind a dam and drives a turbine whose speed is coupled to grid frequency. Power is controlled by controlling how much water is released from the dam. This does have inertia, though perhaps...

Big heavy spinning things (including but not limited to turbines and generators) store energy in their rotational inertia. When those big heavy spinning things are coupled directly to the grid the grid as a whole effectively gains that inertia. This inertia acts as the first line of defence...

Some "two-pole testers" automatically test for continuity if no voltage is detected.

Fundamentally one would expect electricty generated from gas to be more expensive per kWh than gas itself, because gas power plants are only about 55%-60% efficient and because of capital and maintinance costs but that alone doesn't really explain the massive difference seen in the UK. Still I...

I'm fairly sure BS7671 has a list of what standards devices used for isolation should meet and the standards for plate switches (even DP ones) are not on the list. FCUs *are* on the list, but BS7671 doesn't make it clear which part of the FCU should be used for isolation. Personaly if using a...

The problem is the green lobby have convinced the government that the heat pump grants and planning exemptions should only apply to heat-only systems. I think this is very short-sighted, but it's the reality we currently have to deal with :(

According to https://integral-led.com/Image/GetDocument/en/333/ilembh026_guide.pdf the battery is supplied unconnected and needs to be connected before use.

The wiring leaving the left and top of the cream box on the left, certainly doesn't look modern. Some of it looks like old conduit, (which may well contain VIR singles), other bits I can't identify.

Depends, on what you mean by "reasonable" I guess, the 35KW ATAG I have at my current place is ok as a single occupant, but still noticably slower than the traditional tank-based setup at my parents house. I don't think I'd want it as a family. It seems noticablly better than the 28kW bosch I...

The main reason for wanting high power output on a combi is to allow running a bath in a reasonable length of time.

I don't see any mention on the site of what if-any standards the switch is designed to, which is at-least a yellow flag.

We should not design installations we anticipate will be overloaded, but we have to consider the possibility that people will use an installation in ways the designers did not anticipate. One of the functions of overcurrent protective devices is to protect the installation against overloads...

I think, realistically this is only likely to be an issue if the property relies on electricity for space heating *and* has a 60A fuse. Loads like cookers, showers and white goods just don't draw power for long enough to have a meaningful impact on EV charging.

If your cooking and heating are all gas then 80A is plenty. Even if you have an electric cooker and shower I suspect 80A will still be fine in most cases. If you start getting into electic for space heating then things could get tighter. If you are worried about load, and the DNO won't upgrade...