Conducting an Electrical Installation Condition Report (EICR) is rarely a mundane task. Hidden behind riser doors, within switch rooms, and along public corridors lies a vast array of electrical curiosities. Adhering strictly to BS 7671:2018+A3:2024 and the Electrical Safety First (ESF) Best Practice Guide 4, TMUK Group Ltd has chronicled some of the most notable observations encountered recently. Here is a comprehensive look at the types of faults we identify, the regulations they breach, and the rigorous coding applied to them.

1. The Absence of Additional Protection

A recurring theme throughout public areas, such as the club lounges, stairwells, and corridors, is the omission of 30 mA Residual Current Devices (RCDs) on socket-outlets with a rated current ≤ 32 A.

2. Obsolescence and Overcurrent Mismatches

Modern electrical demands often outpace legacy equipment. We frequently encounter BS 3871 miniature circuit breakers. While not inherently dangerous simply due to age, they lack the operational reliability of current harmonised standards.

More critically, we find instances of poor circuit design. On Circuit 3 L1, a 32 A overcurrent protective device was found protecting 2.5 mm² conductors installed via reference method B. The breaker rating exceeded the current-carrying capacity of the cable (approx. 23 A), failing to provide overload protection and risking thermal damage.

3. Compromised Enclosures and IP Ratings

Basic protection is fundamental to electrical safety. When enclosures fail, hazardous live parts are exposed.

• Pool Plant Room: Blanking plates missing from the control panel enclosure, failing to provide IPXXB or IP2X protection Code: C2.
• Lower Ground Switch Room: A luminaire missing its protective diffuser Code: C2.
• Ryefield Panels: Large openings discovered at the top of enclosures, failing the horizontal surface requirement of IP4X or IPXXD, presenting a risk of electric shock and solid object ingress Code: C2.

4. The DNO Security Breach

Unmetered supplies pose a severe arc flash and shock risk. We have documented multiple instances where main service cutouts (Lucy) and Ryefield distribution panels in main switch rooms and 11th-floor risers were completely devoid of security seals.

5. Rogue Terminations and Mechanical Damage

Ad-hoc wiring inevitably leads to hazardous conditions. On the 12th floor, a relocated cable was left terminated in a basic strip connector block with no enclosure. Worse still, in the 8th-floor riser, live conductors were terminated in a connector block wrapped purely in green and yellow PVC electrical tape, a dangerous misuse of protective conductor identification.

Physical damage is also prevalent. A socket on the 12th floor was found with its rocker switch mechanically jammed in the ‘ON’ position, indicating internal failure and a risk of subsequent thermal damage Code: C2.

6. Acoustic and Operational Faults

Electrical faults are not always visual. In the main switch room, a fluctuating humming noise from the switchgear indicated potential internal defects, such as a failing contactor coil or loose components Code: C2.

Operationally, Circuit 7 L2 (patio uplights) tripped the RCBO instantaneously upon energisation, signalling a severe permanent fault, likely moisture ingress Code: C2.

7. The C1 vs C2 Debate: Missing Covers

A classic topic of debate: How do you code a missing distribution board cover? If a DB cover is missing in a highly accessible area, leaving live busbars wholly exposed to casual contact, it is an immediate threat to life Code: C1. However, if that same distribution board is housed inside a locked wooden cabinet, the classification changes.

The locked cabinet acts as an outer barrier. While it lacks the fire-retardant properties of a proper enclosure, it mitigates the immediate risk to the general public. Unlocking it becomes the “foreseeable event” that exposes the danger, strictly categorising it as a Code: C2 in accordance with ESF Best Practice Guide 4 guidelines.

8. Cosmetic vs Functional Indication

Finally, we encountered a broken neon indicator on an 11th-floor laundry double-pole switch. While some may argue this poses a danger by misleading users into thinking the circuit is dead, standard safe isolation procedures dictate a circuit must be proven dead using a two-pole voltage indicator. A neon must never be relied upon for safety. Therefore, this defect, while an indication of wear, does not compromise basic or fault protection.