Electrical Installation Inspection

Per EN 61439-3, domestic and similar consumer units must be type-tested or verified assemblies. All socket-outlet circuits must be protected by 30 mA RCDs per HD 60364-4-41. Circuit breakers must comply with EN 60898 or EN 61009 (RCBOs). Each circuit must be clearly labelled with its designation and protective device rating.

1. Verify the distribution board carries EN 61439-3 type-test certification

2. Confirm 30 mA RCD protection is provided for all socket-outlet circuits per HD 60364-4-41

3. Check that circuit breakers are correctly rated for the cable sizes used on each circuit

4. Inspect labelling — every circuit must be identified on the circuit chart

5. Verify adequate working clearance around the board and accessibility per HD 60364-7-729

- RCD protection missing on socket circuits, particularly in older installations

- Circuit chart missing, incomplete, or not updated after modifications

- Circuit breakers over-rated for the cable size, removing overcurrent protection

- Distribution board not suitable for the environment (incorrect IP rating for location)

Per HD 60364-5-52, cables must be selected and installed according to the installation method, ambient temperature, and grouping. Cable sizing must account for voltage drop (max 3–5 % per HD 60364-5-52 Annex G), current-carrying capacity, and fault current. Fire performance of cables must meet EN 13501-6 classification where required. Cable support and fixings must comply with HD 60364-5-52 requirements for spacing and methods.

1. Verify cable types are appropriate for the installation method per HD 60364-5-52 Table B.52.1

2. Check cable sizing calculations against current-carrying capacity tables, including derating for grouping and ambient temperature

3. Confirm cable routes avoid heat sources and are adequately supported at required intervals

4. Inspect fire-rated cable installations for compliance with EN 13501-6 where fire survival is required

5. Verify voltage drop calculations are within permitted limits

- Cables undersized due to failure to apply grouping or thermal derating factors

- Cable routes running through areas of high ambient temperature without derating

- Fire-rated cables not installed in accordance with the tested system configuration

- Insufficient cable support spacing leading to sagging or damage

- Cables passing through fire barriers without fire stopping

Socket outlets must comply with EN 60309 for industrial applications or national standards for domestic types. Installation heights must meet accessibility requirements. In wet areas per HD 60364-7-701, minimum IP ratings apply (IPX4 in Zone 2). All accessories must be correctly fixed, and conductor terminations must be secure with no exposed live parts.

1. Verify socket outlet types comply with applicable standards (EN 60309 or national type)

2. Check mounting heights meet national accessibility requirements and project specifications

3. Confirm IP ratings are correct for the location, particularly in bathrooms and external areas per HD 60364-7-701

4. Inspect conductor terminations for tightness and correct polarity

5. Verify earth continuity to each socket outlet

- Standard (non-IP-rated) socket outlets installed in locations requiring splash protection

- Reversed polarity at socket outlets

- Mounting heights not consistent or not meeting accessibility requirements

- Socket outlets installed too close to water sources in kitchens and bathrooms

Workplace lighting must meet minimum maintained illuminance levels per EN 12464-1 (e.g. 500 lux for offices, 300 lux for circulation areas). Outdoor workplace lighting per EN 12464-2. Emergency escape lighting must comply with EN 1838, with minimum 1 lux along escape routes and 0.5 lux in open areas. Emergency luminaires must be tested per EN 50172.

1. Measure maintained illuminance levels at working plane height using a calibrated lux meter per EN 12464-1

2. Verify uniformity ratios meet EN 12464-1 requirements for the specific task area

3. Check emergency lighting coverage along escape routes and at changes of direction per EN 1838

4. Confirm emergency luminaires are connected to the correct supply (maintained/non-maintained) and test function on mains failure

5. Review emergency lighting test records per EN 50172 schedule

- Illuminance levels below EN 12464-1 minimums due to incorrect luminaire selection or spacing

- Emergency lighting gaps at changes of direction, intersections, or stairwells

- Emergency luminaires failing to illuminate on mains failure due to faulty batteries

- Glare from poorly positioned luminaires exceeding UGR limits per EN 12464-1

Per HD 60364-5-54, the earthing arrangement (TN-S, TN-C-S, or TT) must be correctly implemented with appropriate earth electrode resistance for TT systems. Main equipotential bonding must connect incoming services (water, gas, structural steel) per HD 60364-4-41. Supplementary equipotential bonding is required in special locations such as bathrooms per HD 60364-7-701. Earth conductor sizing must comply with HD 60364-5-54 Table 54.1.

1. Identify the earthing system type (TN-S, TN-C-S, TT) and verify correct implementation per HD 60364-5-54

2. Verify main equipotential bonding connections to all incoming metallic services

3. Measure earth electrode resistance for TT systems (must be compatible with protective device settings)

4. Check supplementary bonding in bathrooms and other special locations per HD 60364-7-701

5. Verify earth conductor sizes comply with HD 60364-5-54 Table 54.1

6. Inspect bonding connections for tightness and corrosion protection

- Main bonding connections missing to one or more incoming services (commonly gas or water)

- Earth electrode resistance too high on TT systems, preventing protective device operation within required time

- Supplementary bonding missing in bathrooms after renovation works

- Bonding conductors undersized for the installation

- Corroded or loose bonding connections reducing effectiveness

Per HD 60364-7-701, bathrooms are divided into Zones 0, 1, and 2 with specific requirements for each. Zone 0 (inside bath/shower): only SELV at 12 V AC or 30 V DC. Zone 1 (above bath to 2.25 m): minimum IPX4, only fixed equipment with suitable IP rating. Zone 2 (0.6 m from Zone 1): minimum IPX4, socket outlets permitted only with 30 mA RCD and SELV shavers supply per EN 61558-2-5.

1. Verify zone boundaries are correctly defined per HD 60364-7-701 Figure 701.1

2. Check that no equipment is installed in Zone 0 other than SELV circuits at max 12 V AC

3. Confirm all equipment in Zone 1 is fixed, suitably IP-rated (minimum IPX4), and appropriately protected

4. Verify IP ratings of all electrical equipment in Zone 2 (minimum IPX4)

5. Check supplementary equipotential bonding connects all extraneous-conductive-parts in the bathroom

6. Confirm 30 mA RCD protection for all circuits in the bathroom per HD 60364-4-41

- Equipment installed in incorrect zones without adequate IP rating

- Standard socket outlets installed in Zone 2 without RCD protection

- Zone boundaries not correctly determined, particularly with shower enclosures versus open showers

- Supplementary bonding omitted during bathroom refurbishment

- Extractor fans in Zone 1 without suitable IP rating (IPX4 minimum required)

Per HD 60364-6, all new installations and alterations must be verified by inspection and testing before being put into service. Required tests include continuity of protective conductors, insulation resistance (minimum 1 MΩ at 500 V DC for LV circuits), earth fault loop impedance, RCD operation (within 40 ms at 5×IΔn for Type AC), and prospective fault current. Results must be recorded on appropriate certification documents.

1. Verify continuity of all protective conductors including main and supplementary bonding

2. Perform insulation resistance tests on all circuits (minimum 1 MΩ at 500 V DC per HD 60364-6)

3. Measure earth fault loop impedance at the furthest point of each circuit and confirm it is within the maximum Zs values for the protective device

4. Test all RCDs at rated residual current (1×IΔn) and verify disconnection within required time per HD 60364-6

5. Measure prospective fault current at the origin and verify protective device breaking capacity is adequate

- Insulation resistance below 1 MΩ due to moisture ingress or damaged cables

- Earth fault loop impedance exceeding maximum Zs for the circuit protective device

- RCD trip times exceeding the permitted maximum, indicating degraded RCD mechanism

- Test results not properly documented or certification incomplete

- Testing carried out with inadequately calibrated instruments