Standards Guide

ISO 7010 vs ANSI Z535: Which Safety Sign Standard Applies to You?

ISO 7010 and ANSI Z535 are the two dominant safety-sign systems in the world, and they answer the same question in two different visual languages. ISO 7010 communicates through standardized shapes, colors, and wordless pictograms. ANSI Z535 communicates through signal words, text panels, and optional symbols. Which one you should post depends on where the facility is, who reads the signs, and which regulation has jurisdiction.

The Two Systems at a Glance

How ISO 7010 Works

ISO 7010 is a registry of tested safety pictograms built on the design grammar of ISO 3864. The shape and color carry the message category before the viewer resolves the symbol: a red circle with a diagonal bar always prohibits, a yellow triangle always warns, a blue disc always mandates an action, a green square always marks a safe condition or escape route, and a red square always marks fire-fighting equipment. Each registered sign has a stable code — for example P002 (no smoking), W012 (electricity), or E001 (emergency exit) — which makes specifications, audits, and procurement unambiguous across languages.

The standard was first published in 2003 and is maintained with regular amendments; Europe adopted it as EN ISO 7010 in 2012, which effectively made it the reference artwork set for the signage requirements of Directive 92/58/EEC across EU member states. The core promise of the system is language independence: a worker who reads no local language still receives the full message.

How ANSI Z535 Works

ANSI Z535 is a family of six American standards. For facility signage the important parts are Z535.1, which defines the safety colors; Z535.2, which defines environmental and facility sign formats; and Z535.3, which defines how safety symbols are designed and validated. The visual anchor of the system is the signal-word panel: DANGER in white-on-red for hazards that will cause death or serious injury if not avoided, WARNING in black-on-orange for hazards that could, CAUTION in black-on-yellow for hazards that could cause minor or moderate injury, NOTICE in white-on-blue for non-injury messages, and green SAFETY INSTRUCTIONS panels for procedural information.

Below the panel, an ANSI sign states the hazard, the consequence, and the avoidance action in text — and since the 2011 revisions the standard strongly encourages adding a symbol, explicitly permitting ISO-format pictograms. OSHA's accident prevention sign rule, 29 CFR 1910.145, incorporates ANSI Z535.1-2006 and Z535.2-2011 (as well as the legacy Z35.1-1968 and Z53.1-1967) by reference, so signs built to either generation of the American format satisfy OSHA.

Which Standard Is Legally Required?

In the European Union, workplace signage must follow the format requirements of Directive 92/58/EEC as transposed into national law, and conformity with EN ISO 7010 is the accepted way to demonstrate compliance. Posting only US-style text-based signs in an EU workplace is a compliance gap, not just a style choice.

In the United States, OSHA does not mandate ISO 7010. It recognizes the ANSI Z535 formats, and ISO pictograms are acceptable when used within a compliant design — Z535.3 was written to accommodate exactly that. A symbol-only ISO sign is not prohibited, but where a specific OSHA rule prescribes wording (for example, EXIT signs under NFPA 101 and the International Building Code, or radiation area postings under NRC rules), the prescribed text governs and the ISO symbol can only supplement it.

The Combination Format Most Multinationals Use

Global facilities rarely choose one system outright. The dominant pattern is an ANSI Z535 layout with the signal-word panel on top, the ISO 7010 pictogram on the left or center, and bilingual or trilingual text beside it. This satisfies the American preference for graded signal words and explicit consequences while preserving the language-independent ISO symbol that visiting workers and non-native readers recognize. It also lets one artwork library serve both jurisdictions: the registered ISO symbol never changes, and only the text block is localized.

If you standardize on this pattern, specify signs by ISO code plus signal word — for example "W012 + DANGER, High Voltage" — so procurement and audits stay unambiguous, and validate that color use follows the stricter of Z535.1 and ISO 3864-4 colorimetry. See our safety sign color guide for the color specifications both systems use.

Practical Selection Rules

Use ISO 7010 alone for EU sites, multilingual workforces, wayfinding and emergency equipment marking, and anywhere symbol recognition is the priority. Use ANSI Z535 formats for US-only sites, product labels aimed at US consumers, and hazards where severity grading and written consequences materially change behavior. Use the combination format for multinational operations, contractor-heavy sites, and machine builders exporting to both markets. Whatever you choose, keep it consistent: mixing formats for the same hazard class within one facility measurably slows recognition and is the most common finding in signage audits.

Browse the full symbol library by category: prohibition, warning, mandatory, emergency, fire equipment, and GHS pictograms.