ANSI Z535 Standards for Safety Signs, Labels, and Tags

Clear communication is essential for ensuring workplace safety. From warning employees about hazards to labeling equipment and guiding visitors safely through facilities, the way safety signs, labels, and other visual cues are presented can make the difference between preventing an accident and facing one. To address this, the ANSI Z535 standards provide a unified system for designing and using safety signs, labels, tags, colors, and symbols, ensuring that hazard information is consistent, easily understood, and immediately recognizable across workplaces, products, and public spaces.

Let’s take a closer look at what ANSI Z535 is, its key parts, updates, and practical ways to use these standards to improve safety in your facility.

What Is ANSI Z535?

The ANSI Z535 series is a set of American National Standards that establishes a uniform system for safety communication using signs, colors, and symbols. Developed by the National Electrical Manufacturers Association (NEMA) and accredited by the American National Standards Institute (ANSI), this framework ensures that hazard information is instantly recognizable and easy to understand across all industries, regardless of a person’s language or literacy level. By adhering to these standards, organizations can unify safety messaging across diverse workplaces and products, significantly improving the speed of warning comprehension to reduce the risk of injury.

The Seven Standards of ANSI Z535 Series

The ANSI Z535 standards are divided into seven parts, numbered Z535.1 through Z535.7, making it easier for facilities to reference the specific standard they need and implement the guidelines effectively. Each part addresses a distinct aspect of safety communication, from colors and environmental signs to product labels, temporary hazard tags, and electronic media, forming a comprehensive system for consistent hazard messaging.

ANSI Z535.1 | Safety Colors

This is the main component of the ANSI Z535 series. ANSI Z535.1 defines the precise technical specifications for colors like safety red, orange, and yellow. By standardizing these shades, ANSI ensures that Caution looks the same in every facility in the US, eliminating confusion caused by varying color tones.

The Occupational Safety and Health Administration (OSHA) has adopted these ANSI safety color codes, making it essential to verify that any new safety signs meet these exact specifications. For example, the color red is not just used for fire signs! It is also the designated color for danger signs, for labeling containers of flammable liquids, emergency stop buttons, and more.

ANSI Z535.2 | Environmental and Facility Safety Signs

ANSI Z535.2 defines a standardized format for safety signs, built around three essential elements: safety headers with signal words, safety symbols, and sign legends.

ANSI Z535.2 focuses on the physical safety signs permanently installed in buildings and outdoor areas. This standard covers everything from exit signs to high-voltage warnings, providing rules for the design, application, and placement of safety signs to ensure they are visible before an individual enters a danger zone.

Takeaways from ANSI Z535.2

Safety Headers with Signal Words: The safety header is the top panel of a sign and is designed to immediately capture attention. It uses standardized signal words and safety colors to clearly communicate the level of risk, whether it involves immediate danger, a potential hazard, or general safety information. The ANSI-approved signal words for safety signs include:

DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

NOTICE: Used to address practices not related to physical injury, like property damage.

SAFETY INSTRUCTIONS: Indicates specific safety-related instructions or procedures.

Safety signs with the signal words DANGER, WARNING, and CAUTION must also include the safety alert symbol, an exclamation mark inside a triangle, to indicate a risk of personal injury.

Safety Symbol or Pictogram: A safety symbol is a graphic that may be used on safety signs to communicate hazards quickly without relying solely on text. These symbols help overcome language barriers and improve comprehension speed, making them especially valuable in diverse or fast-paced work environments.

Sign Legend (Safety Message): The legend is the text portion of the safety sign that explains the hazard and how to avoid it. To be effective, it should clearly communicate three key elements:

• • The Hazard Type: Clearly states what the danger is.
  • The Consequence: Explains what will happen if the hazard is not avoided.
  • Avoidance Instructions: Tells the viewer exactly what to do or avoid to stay safe.

Keeping the safety message concise and action-oriented ensures it can be quickly understood and followed. Wording like "BRIGHT LIGHT! Wear Eye Protection" could be used on a sign.

ANSI Z535.3 | Criteria for Safety Symbols

ANSI Z535.3 provides criteria for the design, evaluation, and use of safety symbols to identify and warn against hazards and personal injury. This standard promotes the adoption of effective safety symbols and provides guidance for ensuring the symbols convey the intended message clearly and rapidly. ANSI Z535.3 categorizes safety symbols by their intended message, using specific colors and shapes to improve recognition and comprehension:

Hazard Alerting Symbols: Black image on a safety yellow equilateral triangle; warns of potential or imminent hazards.

Mandatory Action Symbols: White image on a safety blue circle; indicates actions to stay safe.

Prohibition Symbols: Black image on a safety red circle with a diagonal slash; shows actions that are not permitted.

Information Symbols: White image on a green or red square or rectangle; provides guidance or location of safety equipment.

By standardizing symbol design, the ANSI Z535.3 standard ensures that safety messages are consistent, immediately recognizable, and easily understood across diverse workplaces and populations.

ANSI Z535.4 | Product Safety Signs and Labels

This standard in the ANSI Z535 series establishes requirements for the design, application, and use of product safety signs and labels. It ensures that important hazard information is clearly communicated on products, helping users understand potential risks and how to avoid them.

Product safety signs and labels must be durable, with high resistance to chemicals, harsh environments, and extreme temperatures. The colors, symbols, safety messages, and signal words used must comply with the specifications outlined in the ANSI Z535 series, creating a consistent and easily recognizable system for product safety communication.

ANSI Z535.5 | Safety Tags and Barricade Tapes (for Temporary Hazards)

ANSI Z535.5 specifies the use of safety tags, barricade tapes, and other temporary visual indicators to communicate hazards that exist for a limited time, such as during maintenance, construction, or spills. The standard ensures a consistent system for design, color, symbols, and placement, so that temporary hazards are immediately recognizable and understood, helping prevent accidents until the situation is resolved.

ANSI Z535.6 | Product Safety Information in Product Manuals, Instructions, and Other Collateral Materials

ANSI Z535.6 provides guidelines for presenting safety information in collateral materials, including manuals, user guides, service instructions, assembly directions, and others. The standard ensures that signal words, the safety alert symbol, and safety colors are used consistently with the other Z535 standards. Following ANSI Z535.6 helps organizations integrate safety messages across signs, labels, and supporting documentation, making hazard information clear, uniform, and easy to understand for employees, consumers, and other users.

ANSI Z535.7: Product Safety Information in Electronic Media

Published in 2024, ANSI Z535.7 is the newest standard in the ANSI Z535 series that provides the first-ever formal guidelines for presenting product safety information in electronic media. The standard ensures that colors, symbols, signal words, and messages are consistent with the rest of the Z535 series, making safety information clear, recognizable, and easily understood, even in digital environments. By standardizing electronic safety communication, ANSI Z535.7 helps organizations maintain effective hazard warnings in today’s increasingly digital workplaces.

ANSI Z535 Updates

The ANSI Z535 series is regularly revised, approximately every five years, to reflect evolving safety practices and technological advancements. While the 2017 reaffirmation maintained the existing standards without major changes, the 2022–2024 revision cycle introduced significant updates, including the publication of ANSI Z535.7, the first entirely new standard in years. These updates ensure the Z535 series remains current, practical, and effective for modern workplaces and safety communication needs.

When to Use ANSI Z535 Safety Signs & Labels

ANSI safety signs, labels, and other visual tools are used wherever clear, consistent hazard communication is essential to protect workers, visitors, and the public. They are widely used across industries where safety risks are present, and compliance with safety regulations is critical. Some of the key application areas include:

Manufacturing and Industrial Facilities: Machinery operation, chemical handling, and production line hazards.

Construction Sites: Temporary hazards, heavy equipment zones, and work-in-progress areas.

Warehouses and Logistics Centers: Material handling, vehicle traffic, and storage safety.

Utilities and Energy Operations: Electrical hazards, confined spaces, and high-voltage environments.

Implementing ANSI Z535-compliant safety signs, labels, and tags helps organizations ensure uniform, easily recognizable hazard communication, reduce accidents, and improve overall workplace safety.

Implement ANSI Standards in Your Facility with Compliant Safety Supplies

Applying ANSI Z535 standards means integrating the right signs, labels, and tags throughout your facility. Begin by identifying hazards and choosing the appropriate safety communication, whether permanent facility safety signs, equipment labels, or temporary tags and barricade tapes. Ensure each item follows ANSI-approved colors, symbols, and signal words for consistency and instant recognition.

Extend these standards to manuals, training materials, and digital communications to maintain a uniform safety message. By using ANSI-compliant safety supplies, you improve workplace safety, organization, and awareness, creating a culture that protects employees, visitors, and operations alike.

Resources

• https://www.osha.gov/
• https://webstore.ansi.org/standards/nema/ansinemaz535set