If you miss labelling some thing which is dangerous, as dangerous there is clearly an error. But 230 volt is "potentially dangerous" so the label is meaning less. Same I suppose goes for double insulated, calling is class II is OK, but the problem with using existing English words of parses is we need to have an official interpretation of the meaning.
So if some thing is safe in 1950, and nothing has changed, then it is also safe now, but things have changed, in 1950 a boiler would not have come with the instructions like this
so today which the boiler that came with these instructions we must clearly report if there is no RCD and if the RCD is not type A. The instructions were pointed out to me when I said there was no real requirement to power the volt free thermostat from the same "circuit" as the boiler, it was pointed out it does need to be connected to same "supply" since most home only have one 230 volt supply it is unlikely that additional components could be connected to a different supply, and it is common practice to use a different circuit to power wireless thermostats to the boiler, Nest being a good example where a USB adaptor can be plugged into any convenient socket to power the remote thermostat.
Clearly this is not what the instructions were considering, but it points out the problem with English and in real terms the installer, and inspector must use common sense gained over their years of experience and not simply try and follow instructions and regulations, and so "potentially dangerous" is really could this become dangerous easily in the future, which is fair enough, but not easy to decide, I remember when the wagon MOT came in we had books issued which carefully laid out the limits, like a 1.5 inch king pin can allow ⅛ inch movement on the edge of the wheel, and I have seen fitters use a dial gauge to measure it where they could not get a replacement in time to see if it would pass.
To miss some thing which does not comply with regulations is clearly wrong, and we have seen court cases where this has happened, but to not class anything as code C2 but to only use code C1 or C3 is not illegal, as long as all faults listed you have done your job.
The 701.415.2 section which says
Where the location containing a bath or shower is in a building with a protective equipotential bonding system in accordance with Regulation 411.3.1.2, supplementary equipotential bonding may be omitted where all of the following conditions are met:
(i) All final circuits of the location comply with the requirements for automatic disconnection according to Regulation 411.3.2
(ii) All final circuits of the location have additional protection by means of an RCD in accordance with Regulation 701.411.3.3
(iii) All extraneous-conductive-parts of the location are effectively connected to the protective equipotential bonding according to Regulation 411.3.1.2.
Is the one which causes the real problem with an EICR. The big question is, could a plumber some time in the future omit the supplementary equipotential bonding even when an RCD has not been fitted?
I would love to see a law saying all domestic premises must be protected by a RCD by 2025, with of course some exceptions like SWA cable, but RCD's are not required by law, and with the exception of where supplementary equipotential has been omitted it is not considered as "potentially dangerous" by many inspectors yet I have watched a debate where even lack of a SPD is considered by some a code C2 in commercial premisses, this was before the latest edition of BS7671 which seems to say if the owner says he does not want them, they can be omitted. But default is to fit, it is advised a written instruction not to fit is obtained.
For an industrial EICR it was common to only test a % and assume unless faults found all was OK, and one would aim to test a different sample every time inspected, one would have the previous inspection so one could select a different sample, there are no different rules industrial, commercial or domestic, the difference is often with industrial there is an electrician on site at least once a week, and strict rules on who can touch electrical equipment. In theory we should never see a bad installation and all should have installation or minor works certificates to cover them, but practice we know is for domestic to have non electrical trained working on the system who rarely issue any paperwork, not only referring to occupant or owner, but also the plumber, kitchen fitter etc.
The
A circuit protective conductor shall be run to and terminated at each point in wiring and at each accessory except a lampholder having no exposed-conductive-parts and suspended from such a point.
seems to have been completely missed by many working on domestic electrics. Also
The bi-colour combination green-and-yellow shall be used exclusively for identification of a protective conductor and this combination shall not be used for any, other purpose.
Single-core cables that are coloured green-and-yellow throughout their length shall only be used as a protective conductor and shall not be over-marked at their terminations, except as permitted by Regulation 514.4.3.
and the reference to single-core seems to have resulted in people feeling they can over-marked, again we must remember an EICR is not done to show it complies, but to identify dangers and potentially dangers, plus make recommendations.
To my mind a green-and-yellow wire should never be used for live, as
potentially some one may connect it to an exposed metal part thinking it is an earth, so even if the regulations do allow over-marking, this could fall off, and so using a green-and-yellow wire for any live is potentially dangerous.
I also have no idea why Worcester Bosch say a type A RCD must be used, so would lean towards issuing a code C2 for type A RCD, but my problem is not all boilers require a type A RCD and not all even require a RCD to be fitted, and it would be a huge amount to reading to find out which are which, so likely would only be a code C3. I would guess type A is because the three port motorised valve has diodes in it and uses DC to stall the motor in centre possition. But this is only a guess, and if correct then any RCD not marked type A when a Y plan is used would also be a code C2, which could likely mean 25% of homes would get code C2 due to wrong RCD type, or would this only be the case where the RCD is relied on, so only with a Y plan in a home with a TT supply?
Even the silly idea of there could be a potential danger if wrong make of device is fitted into a consumer unit. We in the main use common sense, and all I have said is going rather pedantic, and I would not say one should never use code C2 or give a C2 on a type AC RCD in a TT installation, but we use experience, the pre-law consultation seemed to want at least 5 years experience in the trade. But
“qualified person” means a person competent to undertake the inspection and testing required under regulation 3(1) and any further investigative or remedial work in accordance with the electrical safety standards;
which technically means I can't do an EICR because of my disability I could not be sure I could do the remedial work.
You can't leave a home in a dangerous condition, so any code C1 has to be isolated or corrected during the inspection. Also you can't leave a home uninhabitable, so must have DHW, heating, lighting etc. Or you need to find alternative accommodation. Not sure what the landlord would say to you telling them they need to put the tenants into a hotel until repairs are completed? Specially for work which would only take a few hours to correct. So in real terms the inspector should always be able to do the work needed to make safe.
I would say because there needs to be time to make safe, two inspections per day is about the limit, not even sure if you could do two a day, and can't really do one and a half per day, there are people offering to do them for less than £80 in the main the EICR was a loss leader to get more work, so there are some really cheap EICR done, and unless you can then pick up the work generated, your working for a pittance.