Part P Requirements
Most people above seem to have it more or less correct:
Part P notification applies to
Dwelling houses and flats
Dwellings and business premises that have a common supply eg shops and pusbs
that have a flat above
Common areas and shared amenities of flats
{Notes to The Requirements - Part P}
Work that does not require notification comprises:
Replacement of existing accessories and their enclosures, and the cable of a single circuit
Providing mechanical protection to existing fixed installations.
In addition, provided they are not in a special location (including kitchen or bathroom)
Add lights and light switchesto existing circuits provided they are NOT ELV (12volt) installations
Add sockets and Fused Spurs to existing ring or radial circuits
(Note this excludes adding sockets to exuisting spurs)
Add/upgrade equipotential bonding
{Table 1 of Part P}
All other work in notifiable premises requires notification, including installation of new ciorcuits.
It must be demonstrated that none notifiable work is complient with BS7671, normally to do this the work must be inspected by a "compatent person" and a Minor Electrical Works Installation Certificate issued. The "compatent person " need NOT be registered with a self certification scheme.
{Part P para 0.8bii}
The definition of a "compatent person" is a person who possesses sufficient technical knowledge, relevant practical skills and experiance for the nature of the electrixcal work undertaken and is able at all times to prevent danger and where appropriate injury to him/herself and others. {BS7671 Section 2}
It is not necessary for the compatent person to be registered to generate a MEIWC for none notifiable work. {Part P para 0.8bi}
Note however that completion of a MEIWC requires essential measurements to be taken, and this will require measurement of continuiety, insulation measurement , earth fault loop impedance and RCD parameters where an RCD is fitted. this will be commonplace for a competent person who will normally have, or have access to, the equipment needed to take the measurtements, eg an electician undertaking the inspection other than as a part of his normal employment.
NONE PART P ASPECTS
If the shop does not have a flat or other dwelling accomodation attached, or has its own supply, then the work will not be notifiable under Part P. However, your neighbours friend should check if such institutions as the local building control or his insurance company will require an Electrical Installation Certificate, if so they will certainly require it be issued by a registered electrician.
On other points, you list the circuits as 3x30A (which will in fact be 3x32A). Commercial cookers may well exceed the 7.3kW limit for a 32A circuit so this would need to be checked first (domestic cooker have hobs of 6 - 7kW). Also at these power levels you will need to check that voltage drop is within limits. Conversly if the cooker only has an oven these tend to be lower power typically only 2-3 kW so may only need a 20A radial.
Somebody above mentioned Diversity. It IS applicable to commercial appliances . 100fl for first cooker and 75%fl for the additional cooker (On Site Guide app 1 Table 1B ) but this of course only applies to the tails and the total installation load calculation. To be honest I don't know how you add circuits under different clauses of Table 1b so I'm not sure if the ring (as per line 9) would count 100% as the only circuit, or 50% as per "every other circuit" .
