CSA Z321 Safety Signs in Canada vs ANSI and ISO

Short answer

CSA Z321, Signs and Symbols for the Workplace, is the Canadian Standards Association standard for workplace safety signs. Its 1996 edition (reaffirmed in 2006) favours symbol-based signs in the ISO 3864 style, with color and shape showing the type of message, and CSA lists it as withdrawn. Canadian workplaces today mostly use ISO 3864 and ISO 7010 symbol signs, ANSI Z535 signs, or bilingual versions of either, under the rules of their province, territory or federal regulator.

Buyers in Canada often ask for "CSA safety signs". This guide explains what the CSA standard for workplace signs covers, how its style compares with the ANSI and ISO systems you will see on equipment and catalogs, and what to specify when you order. It is background, not legal advice: the sign rules for your workplace come from your province, territory or the federal Labour Program.

What CSA Z321 is

CAN/CSA-Z321-96, Signs and Symbols for the Workplace, is the Canadian Standards Association standard for workplace safety signs. It covers signs that give regulatory, warning or information messages about safety and health, with design rules and advice on choosing and placing signs. The 1996 edition replaced a 1977 first edition and was reaffirmed in 2006. CSA now lists it as withdrawn.

The standard leans on symbols rather than words, with color and shape telling the reader what kind of message a sign carries. That approach suits a country with two official languages and many workplaces where not everyone reads the same language.

Color and shape in the ISO style

CSA Z321 follows the same safety color and shape logic as ISO 3864, which most Canadian workers will recognize:

Message	Shape and color	Example
Prohibition	Red circle with a diagonal bar, black symbol on white	No smoking, no entry
Mandatory action	Blue filled circle, white symbol	Wear eye protection
Warning	Yellow triangle with a black border and symbol	Electrical hazard, forklift traffic
Safe condition	Green square or rectangle, white symbol	First aid, emergency exit
Fire equipment	Red square or rectangle, white symbol	Fire extinguisher, fire hose

A text panel can sit under the symbol to add detail, in English, French or both. OurISO 7010 symbols guide covers the registered symbols themselves.

How it compares with ANSI Z535

ANSI Z535.2 is the American standard for facility safety signs. It uses a signal word panel (DANGER, WARNING, CAUTION or NOTICE) above a message, with or without a symbol. Equipment and signs from the US usually arrive in this format. The practical differences for a Canadian site:

Words vs symbols: ANSI signs depend more on English text; CSA and ISO signs put the symbol first.
Severity: ANSI signal words grade how serious a hazard is; ISO-style signs show the type of message by shape and color.
Mixing: current ANSI Z535 editions allow ISO-style symbols and layouts, so the two systems can sit side by side on one site.

Our guides to ANSI Z535 andDANGER, WARNING, CAUTION and NOTICE explain the ANSI side in more detail.

What to order today

Most Canadian buyers choose one of three routes:

ISO 3864 and ISO 7010 symbol signs, the closest current match to the CSA style, with optional English and French text.
Bilingual ANSI-format signs, where a site already uses ANSI signal words and needs French added.
Matching replacements for older CSA-style signs already on site, so a facility stays consistent.

Whichever you choose, check it against your provincial, territorial or federal rules and your site's own safety program. We print the symbols and wording you choose and do not review signs against any regulation, as set out in our terms.

How to order

Browse ISO 7010 symbol safety signs andcustom bilingual signs, or send a photo of the sign you want to match on the quote form with the size, material and quantity. We manufacture in Pakistan, ship to Canada and worldwide, and confirm shipping, duties and taxes in your quote.

Common questions

Is CSA Z321 still in force?

CSA lists CAN/CSA-Z321-96 (reaffirmed 2006) as withdrawn. Older signs in its style are still on many walls, and a regulation or site program can still point to it, so check the rules that apply to your workplace.

Do Canadian workplaces have to use CSA signs?

Sign requirements come from the occupational health and safety rules of each province and territory, and from the federal Labour Program for federally regulated workplaces. Some rules name a standard and many describe what a sign must do. Confirm what yours require.

Can I use ANSI Z535 signs in Canada?

Many Canadian sites do, especially where equipment comes from the US. ANSI signs rely more on words, so sites often add French text or choose ISO-style symbol signs. Your jurisdiction and site program decide what is acceptable.

What is the difference between CSA Z321 and ISO 7010?

CSA Z321 sets out how Canadian workplace signs should be designed, using the same color and shape logic as ISO 3864. ISO 7010 is the international set of registered safety symbols designed to ISO 3864. A sign can follow ISO 3864 layout rules and use ISO 7010 symbols.

Do my safety signs need to be bilingual?

It depends on your province, your workplace and who reads the sign. Quebec has its own French language rules, and federal institutions have official language obligations. Symbol signs reduce the text that needs translating. See our bilingual labels guide.

Can you print a sign in the CSA style?

Yes. Send a photo of the sign you use now or describe the symbol, colors and wording, and we lay it out for you to approve. We print to your content and do not check signs against any regulation.