Restaurant EICR London: Why Grease, Heat & Three-Phase Make This Harder

A commercial kitchen runs at sustained 30-40°C ambient, peaking near 50°C above grills and fryers. Cable insulation rated PVC 70°C derates rapidly above 30°C. By the time the air at ceiling level is consistently 45°C, the current-carrying capacity of standard T+E or singles drops by 15-20%. Circuits sized for "nominal" conditions overheat on service.

Add airborne grease — vaporised oil that condenses on every nearby surface — and PVC cable jackets degrade from sun-fresh white to brittle yellow inside 18 months. Outer sheath cracks lead to insulation breakdown, which leads to nuisance RCD trips during the lunch rush.

Add steam, water spray from washing-down, and the constant thermal cycling of equipment switching on and off, and you have an environment that BS 7671 treats as significantly harsher than a domestic kitchen. The IET Guidance Note 7 (Special Locations) covers commercial kitchen design specifically.

Commercial induction hobs and ovens commonly draw 12-22kW each, typically on three-phase. A central London restaurant kitchen with 2-3 induction ranges, an induction wok station and a commercial induction salamander can pull 80kW+ peak. Single-phase wiring would be impossible; the install is three-phase from substation to distribution board.

EICR testing on three-phase requires the inspector to verify phase balance, neutral-conductor sizing, and the loop impedance at every distribution point — not just at the consumer unit. Mis-balanced phases on a single-neutral three-phase install produce neutral currents that overheat the neutral conductor, a common defect found on EICR in older kitchens.

High-frequency switching from induction generators also stresses upstream RCDs. Type AC RCDs are inappropriate; Type A is the minimum, Type F (super-immune) or Type B (DC-detecting) are often required for the dedicated induction circuit. Older installations with Type AC on induction loads pick up C2 codes routinely.

The inspection of cable runs above false ceilings, behind equipment, and inside extract canopies is the part of a restaurant EICR that takes time. Grease-coated cables look superficially fine until handled — the jacket cracks when flexed, revealing dried-out PVC underneath.

C2 (potentially dangerous) is the appropriate code where cable jacket integrity is compromised in a way that could expose live conductors under normal handling or vibration. We routinely find C2 cable runs above commercial fryers and over grill stations where extract is undersized.

The remedy is replacement, not patching. Heat-shrink repair sleeves are not suitable for kitchen environments because they degrade in the same conditions that degraded the original jacket. Re-cable in heat-resistant LSF cable rated 90°C (or 110°C for direct equipment final connections) is the durable fix.

Commercial kitchen false ceilings are typically GRP (glass-reinforced plastic) or stainless panels designed to be washed down. The wiring above is rarely inspected by anyone other than the original installer until the EICR.

Common hidden problems: junction boxes wedged between joists with no support, T+E running tight against extract ducts (mechanical damage from vibration plus heat), missing or bypassed RCBOs on cooker circuits, and ad-hoc spurs run during kitchen refits that were never tested or certified.

A thorough EICR requires lifting at least sample ceiling panels for visual inspection. Many "satisfactory" EICRs signed in 30 minutes on a working restaurant skipped this step entirely. We typically allocate 4-6 hours for a full kitchen EICR including ceiling void inspection.

UK commercial kitchens with gas appliances and mechanical extract require a gas interlock system: the extract fan must be proven running before the gas valve opens. The interlock is mandated by IGEM/UP/19 and BS 6173 and forms part of any Gas Safe installation certificate.

From an electrical perspective the interlock is a low-voltage control circuit feeding a solenoid gas valve, a current-sensing CT clamp on the extract motor, and a fan-pressure or airflow proving switch. EICR coverage of the interlock control wiring is standard but the gas-side commissioning sits with Gas Safe — the two trades must be coordinated.

A common finding: the electrical EICR passes, the gas inspection passes, but the interlock combined operation has never been verified end-to-end since the last kitchen refit. Joint electrical + gas commissioning is the only way to discover this before it surfaces during environmental health inspection.

Borough environmental health officers inspect food premises against the Food Safety and Hygiene Regulations 2013, the Regulatory Reform (Fire Safety) Order 2005, and the Workplace Regulations 1992. The EICR is referenced indirectly via the duty to provide a safe workplace and via insurance compliance.

Officers do not directly inspect electrical installations but they will request the EICR certificate during routine visits and following any incident. A missing or expired EICR is treated as evidence of poor management even where no electrical incident has occurred.

Inner London boroughs with the most active food premises enforcement — Westminster, Camden, Tower Hamlets, Hackney — frequently cross-reference EICR cadence against the borough food hygiene rating database. Restaurants with a poor hygiene score and an overdue EICR sit higher on the enforcement priority list.

A working restaurant cannot lose power during service. Lunch service from 11:30 to 15:00, dinner from 17:30 to 23:00, prep from 09:00 to 11:00 and clean-down from 23:00 to 01:00 leaves a 6-8 hour overnight testing window.

Most restaurant EICRs are booked for 23:30 start, working until 05:30 with the engineer leaving before the morning delivery. Overnight rates run 20-35% above day rates — a £450 EICR at 2 days rate becomes £550-£600 overnight.

For multi-unit restaurant groups the efficient pattern is rolling overnight EICR cycles — one unit per night across a portfolio. Group rates and pre-booked schedules typically pull the per-site price back close to standard daytime rates.