AM2 / AM2S case studies
AM2 / AM2S · Put your knowledge to work in context.
AM2 and AM2S are the end-of-training assessments for electrotechnical candidates in the UK, delivered by NET and taken at NET-licensed centres. The AM2 is the final unit of the Level 3 NVQ (City & Guilds 2357 or EAL 1605) and should only be attempted once every other unit is complete; the AM2S is the end point assessment for apprentices training against the Installation & Maintenance Electrician Apprenticeship Standard who started before September 2023, with the AM2S v1 taken by apprentices enrolled from September 2023. The AM2 / AM2S case studies are 5 cases and about 4,923 words.
1Consumer unit change in a block of flats: borrowed neutral and a sealed supply
You are booked to replace the consumer unit in Flat 3 of a converted four-storey terrace. Each flat is metered separately in a locked communal cupboard; Flat 3 has a 100 A DP main switch with a sealed meter and no lockable isolator on the flat side.
957 words, about 5 min2Radial to a garden workshop: derating, grouping and an exported PME earth
An 18 m² timber-framed workshop stands 22 m from a house on a TN-C-S supply. You are to install a 20 A RCBO supplying a 2.5 mm² T&E radial to three double socket outlets.
956 words, about 5 min3EICR on a 1985 semi: interpreting ring readings and a sub-1 MΩ insulation result
You are carrying out an EICR on an owner-occupied three-bedroom semi built in 1985. The board is an 8-way unit with a single 30 mA RCD covering all circuits.
1,006 words, about 5 min4Intermittent RCBO tripping in a kitchen: device, fault or accumulated leakage?
Call-back to a 1990s flat. The 30 mA Type A RCBO feeding the kitchen radial (six double sockets plus one outside socket on an FCU) trips after 20–40 minutes of use, more often in wet weather, and resets every time.
914 words, about 5 min5Consumer unit and shower upgrade in a 1960s house: earthing, bonding and Part P
A 1960s detached house in England, declared TN-S. Ze is 0.35 Ω and PFC 1.6 kA.
1,090 words, about 5 min