C&G 2391-52 case studies
C&G 2391-52 · Put your knowledge to work in context.
The City & Guilds 2391-52 is a Level 3 qualification in initial and periodic inspection and testing of electrical installations, aimed at practising electricians who already hold a Level 3 installation qualification and now need to verify, certify and report on existing and new work to BS 7671. It is the combined route: candidates are assessed on both the verification of a new installation (the electrical installation certificate) and the periodic inspection and condition report of an existing one. The C&G 2391-52 case studies are 5 cases and about 3,561 words.
1The 0.38 MΩ line–neutral reading on a new board
You are carrying out initial verification of a new three-phase distribution board (400/230 V, TN-S) in a small industrial unit before handover. The board has twelve ways: four socket circuits (16 A and 32 A), a 16 A three-phase motor circuit with a DOL starter, four lighting circuits with integral LED drivers, a fire alarm supply and two spares.
765 words, about 4 min2The garage spur that reads 1.28 Ω
A 1980s semi-detached house, TN-C-S, 230 V, 100 A cut-out, 25 mm² tails, single consumer unit. A 32 A Type B MCB supplies a ring final circuit to BS 1363 sockets, and the circuit is protected by a 30 mA RCD.
768 words, about 4 min3The ring final that looks fine until you read the spur
During a periodic inspection of a 1990s three-bedroom house you test the ring final circuit supplying the kitchen and utility room. It is protected by a 32 A Type B MCB and wired in 2.5 mm² T&E with a 1.5 mm² CPC.
613 words, about 3 min4The Friday deadline, the 10% sample and the IT manager
You are asked to carry out an EICR on a 1970s six-storey office building with 12 distribution boards and about 300 final circuits. There are no previous certificates and no drawings.
742 words, about 4 min5Proving dead with a PV array and a locked landlord's cupboard
You are to carry out a periodic inspection of a first-floor tenant's distribution board in a 1960s shop parade. The board is fed by a 3-phase 63 A submain from the landlord's intake cupboard, which is locked and shared with three other tenants.
673 words, about 3 min