I being the person responsible for the design, construction, inspection & testing of the electrical installation (as indicated by my signature below), particulars of which are described above, having exercised reasonable skill and care when carrying out the design, construction, inspection & testing hereby CERTIFY that the said work for which I have been responsible is to the best of my knowledge and belief in accordance with BS 7671:2008, amended to 2015 except for the departures, if any, detailed as follows:
Where does this declaration say that the person who made it is a "registered electrician" or has any qualifications relating to a process by which he or she has acquired the "skills and care" necessary to carry out the work.
It is possible for electrical work to be carried out with the "reasonable skill and care" such that it is in accordance with BS 7671 by a person who has no formal qualifications.
Only if some one questions the person's skill and care does that person have to justify their signature and ability. Questions may be asked by a Building Control Officer, an Insurance Company Underwriter or other interested party.
Two points
(1) The person must be able to satisfy the questioner that reasonable skill and care was used and the standard of work does meet a recognised standard of safety. This can be difficult if the person does not have the necessary skills, care and knowledge of what is a safe standard of work.
(2) Some installations signed off by qualified electricians are not carried out with "reasonable skill and care" and might only pay lip service to BS 7671. Some of these are discovered by random inspections by Building Control, the client or "scheme" managers before any harm is done. Some are only discovered after the event by Fire Investigation Officers.
EDIT some text struck out
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