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Caution Plant Room and Door to Be Kept Locked and No Admittance Authorised Personnel Only Triple-Message Sign – ISO 9001 certified sign for secure utility access.
Professional design, supply, and installation of all types of traffic signs across the UK.
Learn More 🚀The Caution Plant Room and Door to Be Kept Locked and No Admittance Authorised Personnel Only Triple-Message Sign is designed to deliver maximum safety awareness at access points to high-risk utility rooms. Combining three clear messages in one high-impact display, this sign informs, instructs, and restricts — all while supporting ISO 9001 compliance.
Ideal for plant rooms, electrical enclosures, boiler houses, and engineering access points, this signage helps you meet Health & Safety requirements while reducing risk for unauthorised personnel. It includes bold colour blocks (yellow, blue, red) with universal symbols for clarity and quick comprehension.
Manufactured in the UK using high-quality substrates such as Foamex, Corriboard, vinyl, and composite aluminium. This triple-message sign is available in a 500×300 mm format only and includes fixing options for walls, doors, and panels.
This sign consolidates three essential safety messages into one: cautionary (plant room), mandatory (keep locked), and prohibitive (no admittance). It’s especially effective for small entry points where space is limited but safety messaging must be clear.
All elements remain legible under indoor and outdoor conditions, with substrates built to resist UV and moisture exposure.
✔️ Triple-message format saves space and enhances safety
✔️ ISO 9001 certified for UK workplace safety compliance
✔️ Tough, long-lasting materials
✔️ Available with adhesive, drilled, or channel fixings
✔️ Ideal for doors, gates, and utility access zones
✔️ Direct from UK manufacturer
• Electrical and plant rooms
• Utility cupboards and access hatches
• Boiler and generator housing
• Commercial facilities and estates
• Maintenance and contractor zones
• Security-controlled storage rooms
• Combines caution, mandatory, and restriction warnings
• Ideal for plant rooms and high-risk utility access
• ISO 9001 certified and UK-manufactured
• Weatherproof for internal and external use
• Durable 500×300 mm signage format
| Feature | Details |
|---|---|
| Product Name | Caution Plant Room and Door to Be Kept Locked and No Admittance Authorised Personnel Only Triple-Message Sign |
| Sign Type | Triple Message – Caution, Mandatory, Restriction |
| Substrate Options | Vinyl Sticker, Composite Aluminium, 3mm Foamex, 4mm Corriboard |
| Fixing Options | Pre-Drilled, Channel Rail, Self-Adhesive |
| Available Sizes (mm) | 500×300 |
| Compliance | ISO 9001 |
| Section | Link & Description |
|---|---|
| 🛒 Shop All Safety Signs | Browse all UK-compliant safety and warning signs |
| ⚙️ Installation Services | We offer full installation support across the UK |
| 📦 Bulk Orders? | Request bulk discount pricing for councils or large sites |
| 📚 Safety Guidance | HSE Regulations – L64 Guidance on Safety Signs |
Vinyl, Print-direct |
|
| Substrate | Stickers, 1mm PVC Plastic, 2.5mm Composite, 3mm Black Plastic, 3mm Foamex, 4mm White Corriboard, 5mm Foamex |
| Fixing | Channel, Plate Only, Self-Adhesive |
| Size | Width(mm) x Length (mm) | 200×250, 300×150, 500×300 |
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