3300 Volts Warning Sign – HS0067 ISO 7010 Shipboard Safety Sign

3300 Volts Warning Sign – HS0067

A 3300 volts warning sign alerts crew, engineers, and visiting contractors that the equipment behind a panel, door, or enclosure operates at 3300 volts, a medium-voltage level common in a ship’s main electrical distribution system. This is the standard ISO 7010 pictogram for 3300 Volts, showing the recognised electrical-hazard symbol above bold voltage text so the danger reads instantly, in any language, before a hand ever reaches for a handle or latch. It is intended for anyone who may approach switchgear, transformers, or high-voltage cabling during routine duties, maintenance, or an emergency response.

Catalogued as HS0067 in Safety Sign Hub’s Hazard Signs range, this 3300 volts warning sign complements our wider set of shipboard electrical and machinery-space pictograms. Typical shipboard locations include main switchboard rooms, generator and alternator compartments, transformer enclosures, high-voltage cable trunking, and shaft-generator spaces, anywhere a 3300V system is present and unauthorised or uninformed access must be discouraged. Fitting a dedicated 3300 volts warning sign at each of these points gives crew an unmistakable cue the moment they approach, rather than relying on memory or verbal handover alone.

As with the rest of our hazard sign line, HS0067 is available on rigid marine-grade substrate or self-adhesive photoluminescent vinyl, formulated to resist salt spray, heat, and UV exposure typical of shipboard use. The photoluminescent option continues to glow after mains lighting fails, so the warning stays visible during blackout conditions, power restoration work, or an emergency drill when visibility is already compromised.

Why 3300 Volts Matters

Medium-voltage systems at 3300V carry enough energy to cause fatal electric shock, severe arc-flash burns, or equipment explosion if panels are opened or cables disturbed without proper isolation. Unlike low-voltage circuits, a 3300V fault can injure someone standing a considerable distance from the point of contact, which is why clear, consistent warning is placed ahead of every access point rather than left to be assumed. A missing or faded 3300 volts warning sign removes the first line of defence for anyone unfamiliar with a particular vessel’s layout, including new crew, riding technicians, and shore contractors carrying out repairs.

Displaying this sign also supports the ship’s permit-to-work and lock-out/tag-out procedures, giving officers and safety committees a visible reference point during safety rounds, drills, and toolbox talks. When every high-voltage access point is marked consistently, inspectors and crew alike can confirm at a glance that isolation has been considered before work begins, reducing the chance of a procedural shortcut turning into a serious incident.

Compliance and Certification

HS0067 reproduces a registered ISO 7010 safety sign, the internationally recognised standard for graphical hazard symbols used across industry and shipping. Its use aligns with general IMO shipboard safety signage guidance and the broader SOLAS requirement that vessels maintain clear, unambiguous safety markings throughout accommodation, machinery, and working spaces. Surveyors from Port State Control and classification societies routinely check that hazard pictograms such as this 3300 volts warning sign are present, legible, and correctly positioned during safety and electrical surveys, making it a practical addition ahead of inspection.

Installation Recommendations

Mount HS0067 at eye level on or immediately beside the door, hatch, or panel giving access to the 3300V equipment, ensuring it is the first thing anyone sees before reaching for a handle. On exposed or curved surfaces, the self-adhesive vinyl format conforms cleanly, while the rigid substrate suits flat bulkheads and enclosure doors where a more permanent fixing is preferred.

• Reproduces the registered ISO 7010 pictogram for 3300 Volts
• Available in rigid marine-grade panel or self-adhesive vinyl
• Resists salt spray, UV exposure, and engine-room heat and vibration
• Photoluminescent option remains visible during blackout conditions
• Sized and finished for switchboard rooms, transformer bays, and cable trunking access points

Fit HS0067 wherever crew or contractors could encounter 3300V equipment, and pair it with our broader Hazard Signs range and Fire Fighting Signs to keep every working space clearly and consistently marked.