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Electrical safety signs UK
High voltage, lockout/tagout, substation entry, arc flash, and the signage layer that supports the Electricity at Work Regulations 1989.
By Direct Signs Team · ISO 9001 certified UK manufacturer · Updated May 2026
The short answer
UK electrical safety signage is governed by the Electricity at Work Regulations 1989, BS 7671 Wiring Regulations, and the Safety Signs and Signals Regulations 1996. Core signs: W012 high voltage warning, P012 no unauthorised access, lockout/tagout (LOTO) tags, arc flash hazard signs, and substation/switchroom identification. Substations and high-voltage areas require a combination of perimeter, gate, and equipment-level signage.
The legal framework
- Electricity at Work Regulations 1989 (EAWR) — the foundation regulation for UK workplace electrical safety
- BS 7671 (Wiring Regulations / IET) — installation standard, including labelling requirements at distribution boards and isolators
- Health and Safety (Safety Signs and Signals) Regulations 1996 — signage compliance with BS EN ISO 7010
- DSEAR 2002 — for hazardous explosive atmospheres requiring Ex-rated equipment
- Construction (Design and Management) Regulations 2015 — temporary supply, site distribution boards, and overhead line precautions
- HSE GS6 Guidance — overhead line working precautions
Voltage classifications and signage
UK electrical voltage classes (from BS 7671):
- Extra-low voltage (ELV) — under 50V AC / 120V DC. Generally no specific warning required.
- Low voltage (LV) — 50V to 1000V AC / 120V to 1500V DC. Standard mains, single and three-phase. Distribution board and isolator labels required.
- High voltage (HV) — above 1000V AC / 1500V DC. W012 lightning-bolt warning required at all access points, plus voltage value, plus "Danger" header for severe risk.
Substation and switchroom signage
- "Danger high voltage" gate sign — W012 + voltage + "Danger" header
- P012 No unauthorised access — at every entry point
- "Risk of death" warning — DNO standard for many HV installations
- Asset reference and substation ID — for emergency response and DNO records
- Emergency contacts — site duty holder, DNO emergency, on-call electrical engineer
- Inspection and test records — typically inside the gate, recording last test, next due, certifying competent person
- Single-line diagram — for switchgear identification during fault response
- Authorised person list — names of those competent to operate the equipment
- Arc flash hazard sign — for sites with calculated arc flash exposure
Lockout/tagout (LOTO) signage
LOTO is the procedural and signage layer that makes electrical isolation safe during maintenance. A typical LOTO tag includes:
- "Danger — do not operate" in red across the top
- Worker name — who attached the lock
- Date and time attached
- Work being undertaken — short description
- Emergency contact — phone or radio reference
- Removal authorisation — only the named worker (or supervisor with documented procedure)
For multi-worker tasks, multi-lock hasps allow each worker to add their own personal lock. The isolation cannot be released until every lock is removed.
Distribution board labelling (BS 7671 Section 514)
- Circuit chart — what each MCB protects (kitchen sockets, lighting, EV charger, etc.)
- RCD/MCB ratings — current rating and trip class
- Last test date and next due — typically annual EICR for commercial
- Maximum prospective fault current (PFC) — DNO-supplied figure, for installer reference
- Earthing arrangement — TN-S, TN-C-S, TT
- Main isolation procedure — including any DNO-side considerations
Arc flash hazard signage
Arc flash incidents are rare but devastating — a single arc can release 35,000°F heat, blinding light, and pressure waves. Sites with significant arc flash potential display labels showing:
- Hazard category (per NFPA 70E or IEEE 1584 calculation)
- Incident energy in cal/cm² at working distance
- Approach boundaries: limited, restricted, prohibited (in metres)
- PPE rating required at each boundary
- Date of arc flash study and next review
Overhead line precautions
HSE GS6 — working safely near overhead lines. Required signage at construction and agricultural sites:
- "Danger overhead lines" with voltage at site entry
- Goalpost barriers at access points to define safe vehicle height
- Maximum vehicle height on goalposts
- "No work within Xm of overhead lines" notice referencing the GS6 exclusion zone
DSEAR / hazardous area Ex signage
Where flammable or explosive atmospheres can occur (zones 0, 1, 2 for gases; zones 20, 21, 22 for dusts), only Ex-rated equipment may be used. Signage:
- "Hazardous area — DSEAR zone X" at boundaries
- Equipment Ex-rating labels showing Ex marking, temperature class, and certifying body
- "No naked flames / no smoking" at all entry points
- "Anti-static footwear required" where electrostatic ignition risk exists
Materials for electrical signage
- Aluminium composite / anodised aluminium — outdoor substations, perimeter, gates
- Rigid PVC — indoor switchrooms, distribution boards
- Phenolic Traffolyte (engraved laminate) — switchgear identification, won\'t melt or carry charge
- Heavy-duty polypropylene tags — LOTO tags rated for repeated use
- Anti-static / non-sparking labels — Ex-rated areas under DSEAR
- Photoluminescent — emergency egress in switchrooms during power loss
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Quick answers
Electrical safety sign FAQs
Are electrical safety signs a legal requirement?
The Electricity at Work Regulations 1989 (EAWR) require electrical equipment to be safely installed, maintained, and identified. Where signage is part of the safe system of work — high voltage warnings, switchroom access controls, lockout/tagout — the signs must comply with the Safety Signs and Signals Regulations 1996 (BS EN ISO 7010). For DSEAR-zoned areas with explosive atmospheres, additional electrical-suitability signs apply (Ex-rated equipment markings).
What does a high voltage sign look like?
BS EN ISO 7010 W012 — yellow triangle with a black lightning-bolt pictogram. Often supplemented with the actual voltage (415V, 11kV, 33kV, 132kV) and "Danger" header for severe-hazard sites. Used at substations, switchroom doors, transformer cubicles, overhead line crossings, and any location where the voltage exceeds the supplementary protection threshold.
What is lockout/tagout (LOTO) and when is signage required?
LOTO is the safety procedure for isolating energy sources during maintenance — the worker locks the isolation point in the OFF position and attaches a personal tag identifying themselves. Signage on the lock and tag includes worker name, date, work being undertaken, and emergency contact. Required at every electrical isolation point during maintenance under EAWR Regulation 4(3).
What signage is required at electrical substations?
A combination: "Danger high voltage" warnings on perimeter and gate (W012 + voltage), "no unauthorised access" prohibition (P012), "warning — risk of death" notice (often required by DNO standards), arc flash hazard sign with PPE specification, emergency contact and asset reference, and inspection/test records typically displayed on the inside of the gate.
Do consumer units / distribution boards need labels?
Yes. BS 7671 (the Wiring Regulations / IET) Section 514 requires every circuit to be identified at the distribution board with a circuit chart showing what each MCB protects. RCD/MCB ratings, last test date, and isolation procedure should also be documented at the board. For commercial installations, a separate label showing maximum prospective fault current (PFC) is good practice and often a DNO requirement.
What is arc flash signage?
Arc flash is a high-energy electrical fault that releases extreme heat, light, and pressure. Sites with significant arc flash potential (industrial switchgear, large transformers) display arc flash hazard signs showing: (1) hazard category, (2) incident energy in cal/cm², (3) approach boundaries (limited, restricted, prohibited), (4) PPE required at each boundary. Calculated per IEEE 1584. Increasingly common in UK industrial electrical safety practice.
What materials are best for electrical signage?
For permanent identification (substation gates, switchroom doors, distribution boards): aluminium composite or anodised aluminium for outdoor durability, rigid PVC for indoor switchrooms. For LOTO tags: heavy-duty polypropylene tags rated for repeated handling. For high-temperature/spark environments: phenolic Traffolyte (engraved laminate) which won't melt or transfer current. Ex-rated equipment in DSEAR areas requires non-sparking, anti-static label specifications.
Electrical signage to spec
Substation gate signage, LOTO tag sets, arc flash labels with calculated incident energy, and distribution board circuit charts. ISO 9001 certified UK manufacturer.