High Voltage Sign

High Voltage Sign – ISO 7010 Warning Symbol HS0041

This High Voltage sign warns crew and contractors that the equipment or enclosure nearby carries electrical current at a level capable of causing serious injury or death on contact. The sign combines the standard black lightning-bolt hazard triangle with a bold “DANGER – High voltage” text panel beneath it, giving anyone approaching the equipment an instant visual cue plus an explicit written instruction in a single fixture.

As SKU HS0041 in the Hazard Signs range, it is built for continuous marine exposure and suits switchboard rooms, transformer enclosures, generator rooms and any compartment where high voltage plant is installed.

The upper section shows the familiar black lightning bolt inside a warning triangle, while the lower panel spells out “DANGER” in bold capitals followed by “High voltage” in smaller text, a combined pictogram-and-wording format that leaves no doubt about the severity of the electrical hazard behind the enclosure.

Because this equipment can injure or kill without any physical contact through arc flash, the written panel gives crew and visiting contractors the specific context a generic lightning-bolt symbol alone cannot provide. The photoluminescent base keeps this electrical warning visible for a period after lighting fails, useful in machinery and switchboard spaces where a power event and a loss of main lighting can occur together.

Why High Voltage Marking Matters

Electrical incidents involving high voltage plant are disproportionately severe compared with low voltage faults, and clear signage at every access point is a fundamental control recognised across marine and industrial electrical safety codes.

High voltage signage supports permit-to-work and isolation procedures before any switchboard or transformer enclosure is opened, and reminds crew and visiting contractors that specialist authorisation is required before approaching the equipment. It also gives supervisors a clear reference point when briefing new starters on which compartments and enclosures carry a high voltage hazard.

Compliance and Certification

This sign is produced to align with IMO shipboard safety signage guidance and the combined pictogram-and-text warning format used across shipping and industrial electrical safety, supporting the ISM Code’s requirement for documented control of electrical hazards. A visible high voltage warning at every switchboard, transformer and generator enclosure is a documented control that classification surveyors and internal safety auditors expect to see during an electrical safety review.

Installation Recommendations

Mount the sign directly on or beside every enclosure, cabinet or compartment containing high voltage equipment, at a height that is seen before the enclosure is opened. Use the pre-drilled fixing holes with marine-grade fasteners for exterior and high-vibration machinery spaces, and the self-adhesive backing for interior switchboard doors and control panel applications. Confirm during permit-to-work reviews that the sign remains legible on every relevant enclosure, particularly after equipment has been serviced or replaced.

• 425 x 567mm rigid or self-adhesive format for steel, aluminium or GRP surfaces
• Photoluminescent base for visibility during power loss or blackout drills
• UV-stable, saltwater-resistant construction for long-term exterior exposure
• Self-adhesive or pre-drilled fixing options for fast, secure installation
• Combined pictogram and bold English text for added clarity beyond the symbol alone

Order the HS0041 High Voltage sign today to mark every switchboard, transformer and generator enclosure before your next electrical safety audit. Safety Sign Hub stocks the complete IMPA/ISSA-coded hazard sign range and ships marine-grade signage across Australia and to vessels in port, with bulk pricing for fleet orders.

See the full Hazard Signs range for related ISO 7010 warning pictograms, or browse our Fire Fighting Signs for IMO A.654(16) fire control signage to complete your vessel’s safety signage plan.