SPECIALIST SECTOR

Food Processing Electrical Installation UK: Food Factory Wiring Guide

Everything UK electricians need to know about food processing electrical installation — IP69K wash-down ratings, ATEX dust explosion zones, hygienic design principles, stainless steel enclosures, BRC Global Standard requirements, and allergen zone electrical segregation.

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17 min readUpdated 2026-06-10Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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What IP rating do you need for electrical equipment in a food factory?

Electrical equipment in food processing wash-down areas needs a minimum of IP69K — the highest ingress rating, certifying protection against high-pressure (80 bar), high-temperature (80°C) close-range water jets. IP65 and IP66 are not sufficient where steam or hot-water lances are used. Equipment must also be hygienically designed, made of stainless steel, and chemically compatible with the cleaning agents on site.

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Key Takeaways

  • 1Food processing electrical installations must withstand regular high-pressure, high-temperature wash-down using aggressive cleaning agents. Minimum IP69K rating is required for equipment in wash-down zones — IP65 or IP66 is not sufficient.
  • 2Grain, flour, sugar, and other organic dusts present a real explosion risk. ATEX dust zone classification (Zone 20, 21, 22) applies to mills, silos, conveyors, and mixing areas. DSEAR (Dangerous Substances and Explosive Atmospheres Regulations 2002) compliance is mandatory.
  • 3Hygienic design principles — sloped tops on enclosures, no horizontal ledges, smooth crevice-free surfaces, stainless steel construction — prevent food residue accumulation and support effective cleaning and disinfection.
  • 4BRC Global Standards (specifically BRC Food Safety) require that all equipment and structures in food manufacturing areas be hygienic in design and construction, cleanable without contaminating the product, and maintained in a condition that does not create a food safety risk.
  • 5Allergen zone segregation may require dedicated electrical systems, separate cable routes, and physical separation of control panels to prevent cross-contamination between allergen and non-allergen production areas.
  • 6CompEx qualification is required for electricians carrying out electrical work in ATEX dust-classified zones in flour mills, grain stores, and sugar processing facilities.
  • 7Reg 421.1.7 was redrafted in BS 7671:2018+A4:2026. AFDDs are now required on socket-outlet final circuits (≤32 A) in Higher Risk Residential Buildings, HMOs, student accommodation and care homes; for all other premises — including food factories — they are recommended on single-phase socket-outlet final circuits (≤32 A). Food factory conditions (cable damage from wash-down, pest activity, vibration, frequent maintenance) make arc fault risk a genuine design consideration.
  • 8In high-ambient-temperature zones (near ovens, dryers, tunnel pasteurisers), cable current-carrying capacity must be derated. BS 7671 Reg 523.4 sets how ambient temperature is established, and Reg 523.5 requires that where cables with different maximum operating temperatures are grouped together, the current-carrying capacity of all cables in the group shall be based on the lowest maximum operating temperature of any cable in the group, together with the appropriate group rating factor from Appendix 4 Tables 4C1 to 4C6.
  • 9Food factories with large VFD-driven conveyors, refrigeration compressors, and motor-heavy plant generate switching transients that can damage sensitive control equipment. BS 7671 Reg 534.4.1.6 requires that consideration be given to the provision of surge protective devices (SPDs) to protect against switching overvoltages produced by current-using equipment located within the installation — exactly the transients that large motors and variable speed drives generate.
01 · Specialist Sector

Food Processing Electrical Installation in the UK

Food processing electrical installation is a demanding specialism that combines the challenges of industrial electrical work with strict food safety, hygiene, and in many cases, hazardous area requirements. The UK food manufacturing sector — one of the largest in Europe, employing over 400,000 people and producing £104bn of output annually — requires electrical contractors who understand both the technical and regulatory dimensions of food factory electrical work.

The consequences of inadequate electrical installation in a food factory extend well beyond the electrical system itself. Contamination of food products, pest ingress through poorly sealed enclosures, explosion from combustible dust, and failure to comply with BRC or retailer audit requirements can all result from substandard electrical installation. The reputational and financial consequences for food manufacturers are severe.

  • Regulatory framework — food processing electrical installations must comply with BS 7671 (Wiring Regulations), DSEAR 2002 (where combustible dusts are present), the Food Safety Act 1990 and associated regulations, and industry standards including BRC Global Standard for Food Safety.
  • Retailer requirements — major UK food retailers require their suppliers to achieve certification to the BRC Global Standard or equivalent (IFS Food, SQF). The electrical installation is assessed as part of the audit. Failures at audit due to electrical non-conformances can result in loss of supply contracts.
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02 · Specialist Sector

IP69K Wash-Down Environments

Wash-down is fundamental to food factory hygiene. Production areas are cleaned at the end of every shift — sometimes multiple times per day — using high-pressure hot water lances and caustic cleaning agents. All electrical equipment in these areas must be able to withstand this process without ingress of water, loss of function, or release of contaminants.

Rating
Protects against
Food factory use
IP65
Dust-tight; low-pressure water jets from any direction
Not sufficient for wash-down areas
IP66
Dust-tight; powerful water jets from any direction
Not sufficient for wash-down areas
IP69K
High-pressure (80 bar), high-temperature (80°C) close-range steam/water jets, all angles
Required minimum

IP ratings are defined in IEC 60529 / BS EN 60529. The rating must be verified on the equipment certificate, not assumed from the enclosure material.

  • IP69K requirements — IP69K (defined in IEC 60529) certifies protection against high-pressure, high-temperature water jets: test conditions are 80°C water at 80 bar pressure, flow rate of 14–16 litres per minute, nozzle at 100–150mm distance, applied from all angles over a 30-second duration. This closely mirrors the conditions used in food factory cleaning.
  • Chemical resistance — IP rating alone does not address chemical resistance. Gaskets, seals, and enclosure materials must be compatible with the cleaning chemicals used on site — typically alkaline detergents (NaOH-based), acid rinses (phosphoric acid), and disinfectants (quaternary ammonium compounds, peracetic acid). Manufacturer compatibility data must be verified for each chemical used.
  • Drainage — even IP69K-rated enclosures can accumulate condensate internally. Internal drainage plugs or breathers allow condensate to drain without compromising the IP rating. In environments with significant temperature cycling, thermal management of enclosures prevents condensation damage to electrical components.
  • Cable glands and conduit entries — all cable entries into IP69K-rated enclosures must use IP69K-rated glands or conduit fittings. A weak seal at a cable entry undermines the enclosure's IP rating entirely. Glands must also be chemically compatible with cleaning agents.
03 · Specialist Sector

ATEX Dust Explosion Zones in Food Processing

Organic dusts — flour, grain, sugar, dried milk, cocoa, spice — are combustible and can form explosive clouds in concentrations above their Minimum Explosible Concentration (MEC). Dust explosions in food factories have caused fatalities and significant property damage in the UK. DSEAR 2002 and the ATEX Regulations require formal zone classification and appropriate equipment selection wherever these dusts are present.

Zone 20
Category 1D (Da) equipment

A combustible dust cloud is present continuously or for long periods inside equipment. Typically the interior of hoppers, silos, mills, conveyors, cyclones, and bag filters.

Zone 21
Category 2D (Db) equipment

A combustible dust cloud is likely to occur in normal operation. Typically the immediate surroundings of Zone 20 equipment, filling points, transfer points, loading spouts, and sifters.

Zone 22
Category 3D (Dc) equipment

A combustible dust cloud is unlikely in normal operation but may occur in abnormal conditions. The wider area around Zone 21 locations where dust layers may accumulate.

  • CompEx for dust zones — electricians carrying out installation or maintenance work in ATEX dust zones must hold CompEx certification covering dust zone work (ExD units). Installation requirements differ from gas zones — dust can penetrate through smaller gaps and surface temperature limits are defined differently.
04 · Specialist Sector

Hygienic Design Principles for Electrical Installations

Hygienic design is not simply about choosing stainless steel — it is a comprehensive approach to designing equipment and structures so that they can be effectively cleaned and do not harbour food residues, bacteria, or pests. The European Hygienic Engineering and Design Group (EHEDG) and the BRC Global Standard both provide detailed guidance on hygienic design requirements.

  • Sloped tops — horizontal surfaces on electrical enclosures are collection points for dust, food residues, and pests. All enclosures in food production areas must have sloped tops — a minimum of 3 degrees from horizontal, and 45 degrees or more in high-care areas. Sloped tops allow wash-down water to drain rather than pool.
  • No horizontal ledges or recesses — shelves, ledges, and recesses inside and outside enclosures are contamination risks. All surfaces should be smooth and continuous. Any unavoidable external ledges must be sloped. Internal surfaces must be smooth and free of shafts, threads, or other features that cannot be cleaned.
  • Continuous welds — intermittent or spot welds create crevices where bacteria and food residues accumulate and are protected from cleaning. All welds on food contact or food proximity surfaces must be continuous, ground smooth, and free of porosity.
  • Accessible for cleaning — all parts of the electrical installation that require cleaning must be accessible without the need to dismantle equipment. Control panels must be positioned or mounted to allow cleaning of all surfaces including behind and beneath. Leg heights and clearances are defined in EHEDG guidance.
05 · Specialist Sector

Stainless Steel Enclosures in Food Factories

Stainless steel is the material of choice for electrical enclosures in food processing environments. It resists corrosion from cleaning chemicals, can withstand high-pressure wash-down, does not harbour bacteria, and meets hygienic design requirements when correctly fabricated and finished.

304 (EN 1.4301)
18/8 austenitic

Suitable for most food processing environments. Good corrosion resistance to common cleaning chemicals.

316 (EN 1.4401)
18/10/2, with molybdenum

Required in high-chloride environments — fish processing, brine handling, and where hypochlorite disinfectants are used regularly.

316L
Low-carbon variant

Preferred for welded fabrications to avoid carbide precipitation (sensitisation) at weld zones.

  • Grade selection — 304 stainless steel (18/8, EN 1.4301) is suitable for most food processing environments. 316 stainless steel (18/10/2, EN 1.4401) is required in high-chloride environments such as fish processing, brine handling, and areas where hypochlorite disinfectants are used regularly. 316L (low-carbon) is preferred for welded fabrications to avoid sensitisation.
  • Surface finish — external surfaces of enclosures should have a smooth, polished finish (typically 2B or BA finish) that minimises surface roughness and is easy to clean. Rougher finishes (No. 4 brushed) are used in some applications but are harder to clean than polished finishes.
  • Fixings and hardware — all fixings (bolts, nuts, hinges, locks) should be stainless steel of the same grade as the enclosure, or at least of compatible grade. Dissimilar metal contact between stainless steel and carbon steel fixings causes galvanic corrosion. Nylon and non-metallic fixings are acceptable in many low-stress applications.
06 · Specialist Sector

Hygienic Cable Management Without Crevices

Cable management in food processing areas presents significant challenges for hygienic design. Conventional cable tray, trunking, and ladder rack have many surfaces, edges, and fixings that are difficult to clean and may accumulate food residues or harbour pests. Hygienic cable management requires careful selection and detailing.

  • Stainless steel wire mesh tray — smooth-surfaced stainless steel wire mesh cable tray is widely used in food factories. It is easy to clean, allows drainage, and does not create horizontal ledges if mounted correctly. Joints and fixings must be stainless steel and flush to avoid contamination points.
  • Minimise horizontal runs above open product — cable management above open food should be minimised. Where overhead runs are unavoidable, use round conduit or smooth-surfaced trunking that cannot collect debris, and ensure that any failure (cable, conduit clip, or fixing) would not cause a product contamination incident.
  • Sealed conduit systems — in high-care and high-hygiene areas, conduit systems may be preferred to open cable management because they enclose the cables and prevent ingress of food residues. All terminations must be sealed. Conduit must be self-draining or drainable.
  • Cable types — cables in wash-down areas must have chemical-resistant outer sheaths compatible with the cleaning agents used on site. PVC sheathed cables are acceptable in many areas but may be attacked by certain disinfectants. LSF (Low Smoke Free) halogen-free cables with appropriate sheath materials are specified in many food factory projects.

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07 · Specialist Sector

BRC Global Standards & Electrical Compliance

BRC Global Standard for Food Safety (Issue 9, published 2022) is the most widely used food safety certification standard in the UK. Certification is required by most major UK retailers as a condition of supply and is recognised by the Global Food Safety Initiative (GFSI). The electrical installation is assessed as part of the BRC audit.

  • Equipment condition and maintenance — BRC requires that all equipment, including electrical equipment, be maintained in good condition and subject to a planned preventive maintenance programme. Evidence of maintenance records, calibration certificates, and corrective actions for defects must be available at audit.
  • Anti-shatter lighting — lighting in food production areas must be protected against shattering to prevent glass contamination of food. Shatter-resistant sleeves, anti-shatter LED fittings, or enclosed luminaires are all acceptable. BRC auditors will check that lighting protection is in place and that there is a procedure for dealing with any broken lamp.
  • Pest control integration — the electrical installation must not provide harborage for pests. Sealed enclosures, sealed cable entries, and hygienic mounting that eliminates voids and ledges all contribute to pest control. Open conduit ends, poorly sealed panels, and cable routes with voids behind walls are common BRC findings.
08 · Specialist Sector

Allergen Zone Electrical Segregation

Allergen management is a food safety critical requirement. The 14 major allergens identified in UK food labelling law — including nuts, gluten, milk, eggs, and shellfish — must be controlled to prevent unintended cross-contamination. The electrical installation can contribute to or undermine allergen zone segregation.

  • Physical separation of cable routes — cable management systems must not create pathways for allergen-containing dust or debris to travel from allergen zones to allergen-free zones. Trunking and conduit passing through partition walls between zones must be sealed to maintain physical separation.
  • Separate control panels — where allergen and non-allergen production lines are in adjacent areas, separate control panels for each area support clear operational segregation and simplify allergen cleaning validation (the scope of cleaning for each panel is clear and separate).
  • Panel ventilation and filtration — control panel ventilation systems must not draw allergen-containing air from allergen zones and discharge it into allergen-free areas. Where ventilation or cooling is required, filtered air intake and directional discharge must be designed to respect the allergen zone boundaries.
  • Colour coding — many food factories use colour coding for electrical accessories, cable ties, and tools to reinforce allergen zone segregation. This is a site-specific procedural control but the electrical installation can support it through consistent use of zone-specific colours for socket outlets, isolators, and other field equipment.
09 · Specialist Sector

BS 7671 Design Requirements: AFDDs, Cable Derating, and SPDs

Beyond the food-industry-specific requirements covered above, food factory electrical installations must satisfy several BS 7671:2018+A4:2026 design obligations that are particularly relevant in these environments. The 18th Edition Wiring Regulations underpin every food factory design alongside the food-safety standards.

Regulation
What it requires
421.1.7
AFDDs on socket-outlet final circuits (≤32 A) — required in specified residential building types, recommended for other premises such as food factories
523.4 / 523.5
Cable derating — ambient temperature determination, and lowest-temperature basis for mixed-temperature cable groups (Tables 4C1–4C6, Appendix 4)
534.4.1.6
Consideration of SPDs against switching overvoltages produced by current-using equipment within the installation (large motors, VFDs)
411.3.3
Additional protection by 30 mA RCD for socket-outlets (≤32 A), subject to the documented risk-assessment exception in non-dwellings
  • Arc fault detection — BS 7671 Reg 421.1.7 — Reg 421.1.7 was redrafted in BS 7671:2018+A4:2026. It is now a requirement to fit arc fault detection devices (AFDDs) on final circuits supplying socket-outlets rated not exceeding 32 A in Higher Risk Residential Buildings, Houses in Multiple Occupation, purpose-built student accommodation, and care homes. For all other premises — which includes food factories — the regulation recommends AFDDs on single-phase AC final circuits supplying socket-outlets not exceeding 32 A. Food factory environments present elevated arc fault risk factors: mechanical damage to cables from wash-down equipment and machinery, pest activity gnawing cable insulation, vibration from plant and conveyors, and frequent maintenance disturbing terminations. AFDDs should therefore be actively considered as part of the electrical design for food factory final circuits, particularly in concealed or inaccessible cable runs.
  • Cable derating in high-temperature zones — BS 7671 Regs 523.4 & 523.5 — Areas adjacent to ovens, tunnel pasteurisers, hot-fill lines, and drying plant can sustain ambient temperatures well above the 30°C reference used in standard cable sizing tables. BS 7671 Reg 523.4 requires the ambient temperature to be taken as the temperature of the surrounding medium when the cable is not loaded, with the appropriate rating factor from Appendix 4 then applied. Under Reg 523.5, where a group contains cables of different maximum operating temperatures, the current-carrying capacity of all cables in the group shall be based on the lowest maximum operating temperature of any cable in the group, together with the appropriate group rating factor from Tables 4C1 to 4C6 of Appendix 4. Grouping a 90°C-rated cable with a 70°C cable therefore forces the whole group to be sized on the 70°C basis.
  • Surge protective devices (SPDs) — BS 7671 Reg 534.4.1.6 — Food factories typically contain large numbers of VFD-driven conveyors, refrigeration compressors, pump motors, and contactors. BS 7671 Reg 534.4.1.6 requires that consideration be given to the provision of SPDs to protect against switching overvoltages produced by current-using equipment located within the installation. Large motors and variable speed drives are exactly the kind of current-using equipment that generates these switching transients, and they can damage PLCs, HMIs, instrumentation, and other sensitive control equipment if SPDs are not provided at appropriate points in the distribution system. SPD requirements should form part of the electrical design scope for any food factory with significant motor or VFD loading.
  • RCD additional protection — BS 7671 Reg 411.3.3 — As revised in A4:2026, Reg 411.3.3 applies additional protection by a 30 mA RCD to socket-outlets with a rated current not exceeding 32 A. In wash-down and damp food production areas this protection matters all the more. The regulation retains an exception allowing RCD protection to be omitted — other than in a dwelling — where a documented risk assessment determines it is not necessary, though for general-purpose socket-outlets in a food factory that exception is rarely justified.
10 · Specialist Sector

For Electricians: Working in Food Processing Facilities

Food processing electrical work combines the challenges of industrial electrical work with strict hygiene requirements, food safety regulations, and in some facilities, ATEX hazardous area requirements. It is well-rewarded, in constant demand, and offers interesting technical challenges.

Hygiene Rules Are Non-Negotiable

Food factory hygiene rules apply to all contractors without exception. This typically means hair covering, protective clothing, no jewellery or loose items, no food or drink in production areas, and strict foreign object controls — every screw, cable tie, and tool must be accounted for. Failure to comply with site hygiene rules will result in immediate removal from site.

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BRC auditors review electrical maintenance records, test certificates, and corrective action records. Use Elec-Mate to produce professional, well-organised test records and inspection reports that demonstrate compliance and give food factory quality managers the documentation they need for audit.

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