Understand IP ratings for UK electrical equipment

Helpful video reference. Joe Robinson Training's video "CONSUMER UNIT IP RATINGS — Electricians Q&A — BS7671" covers IP ratings in the context of BS 7671, including the requirements for consumer unit enclosures. Joe Robinson lectures on electrical installation at Tresham College and his explanations of the standard are reliable and UK-specific.

1. What the IP code is and where to find it

IP stands for Ingress Protection. The system is defined by IEC 60529, adopted in the UK as BS EN 60529. Every compliant electrical product for indoor or outdoor use carries an IP code on its data plate, packaging, or installation instructions.

The code always appears as the letters IP followed by exactly two digits — for example IP44, IP65, or IP67. Occasionally you will see a letter X in place of one digit, which means that characteristic has not been independently tested by the manufacturer. This does not mean no protection exists; it means none has been declared.

2. Decode the first digit (solid particle protection)

The first digit runs from 0 to 6 and describes how well the enclosure keeps out solid objects and dust:

• 0 — No protection
• 1 — Protected against objects larger than 50 mm (a hand, but not fingers)
• 2 — Protected against objects larger than 12.5 mm (fingers and similar)
• 3 — Protected against objects larger than 2.5 mm (tools and thick wire)
• 4 — Protected against objects larger than 1 mm (thin wire, small screws)
• 5 — Dust-protected (limited ingress, no harmful deposit)
• 6 — Dust-tight (no ingress at all)

For most domestic electrical accessories — sockets, light fittings, consumer units — IP2X is the minimum required to be safe to touch. For a workshop with grinding dust or a garage with fine sawdust in the air, IP5X or IP6X prevents equipment damage over time.

3. Decode the second digit (liquid ingress protection)

The second digit runs from 0 to 8 and describes water resistance:

• 0 — No protection
• 1 — Protected against vertical drips
• 2 — Protected against drips at up to 15° from vertical
• 3 — Protected against spraying water up to 60° from vertical
• 4 — Protected against water splashed from any direction
• 5 — Protected against water jets from any direction
• 6 — Protected against powerful water jets
• 7 — Protected against temporary immersion (up to 1 m for 30 minutes)
• 8 — Protected against continuous immersion (to a depth specified by the manufacturer)

For outdoor wall lights, IPX4 is the practical minimum. For recessed shower downlights or fittings directly above a bath, IPX4 is required in Zone 1 under BS 7671 Section 701. For fittings that might be cleaned with a pressure washer or hose, IPX5 is the minimum.

4. The BS 7671 bathroom zone requirements

BS 7671 Section 701 defines zones in a bathroom or shower room and sets minimum IP ratings for electrical equipment in each:

• Zone 0 — Inside the bath or shower tray itself. Only SELV (Safety Extra Low Voltage) equipment rated at least IPX7 is permitted.
• Zone 1 — The space directly above the bath or shower, from the floor up to 2.25 m. Equipment must be rated at least IPX4, or IPX5 where pressure-shower systems are installed.
• Outside the zones — Standard equipment is acceptable, but IPX4 is good practice near a basin where splash is likely.

Note that BS 7671 Amendment 2 removed the old Zone 2 classification. Some older fitting packaging may still reference it — check whether your installation complies with the current 18th Edition requirements.

5. Common IP ratings and what they are used for

• IP20 — Standard indoor light fittings and socket outlets. Not suitable for bathrooms or outdoors.
• IP44 — Outdoor fittings in sheltered positions, bathroom Zone 1 downlights.
• IP54 — Outdoor fittings in exposed positions, external sockets.
• IP65 — Recessed bathroom downlights (fire-rated type), outdoor floodlights, external LED strip drivers.
• IP67 — Submersible pond lights, underground junction boxes, cable connectors buried in soil.
• IP68 — Pond pumps, underwater feature lighting, cable accessories in permanently wet locations.

When to call us

IP ratings matter most when planning bathroom lighting, outdoor socket installations, or any work in a damp or dusty environment. An incorrect choice is a common reason for a C2 code on an EICR — not immediately dangerous, but requiring remediation before the next inspection. Richard checks IP suitability as part of every EICR and will advise on the right fitting for any new installation in Sandwich or east Kent.