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How High Do Fire Alarm Pull Stations Have to Be?

June 12, 2026

This one came from a real Ontario social-media question:

If CAN/ULC-S524 says 1050 mm to 1150 mm to centre, but the Ontario Building Code says 1200 mm, which height is actually right for a pull station in Ontario?

That is a much better question than it looks, because it is not really a fight between two random numbers. It is a question about how the Ontario barrier-free rule and the fire alarm installation standard fit together.

The two rules you have to read together

Start with the two governing pieces:

If you stop there, it looks like a contradiction.

But CAN/ULC-S524 Annex A.26.1 is what makes the relationship clearer. It explains that the 1150 mm maximum, measured to the centreline of a standard 1-gang electrical device box, positions the operating action of the manual station at not more than 1200 mm above finished floor, which matches the upper limit of controls in a barrier-free path of travel.

That means the ULC clause was written with the accessibility requirement in mind, not in ignorance of it.

What the practical answer is in Ontario

For a typical manual station in Ontario, the clean field answer is usually:

So if someone asks, "Is Ontario 1200 mm to the top or to the centre?", the safer answer is:

The Ontario issue is not really "top vs centre." The better way to read the sources is that S524 gives the fire alarm installation measurement to the centre, and its Annex explains how that measurement keeps the operable part within the 1200 mm barrier-free limit.

That is much stronger than guessing based on installer habit or internet opinions.

Where people get into trouble

People run into trouble when they flatten the issue into one of these oversimplifications:

All three are weak answers.

The better reading is that the sources are meant to work together:

The part people forget after the height

Height is not the only rule attached to manual stations.

Clause 26.2 says manual stations must be installed so as to be visible at all times.

The note under that clause adds practical placement guidance: where possible, install the station on the latch side of a single door at a maximum lateral distance of 1500 mm from the door opening.

So even if the height is right, a badly placed station can still turn into a real field problem.

What verifiers and service techs should look for

If you are checking an existing installation, the useful field checklist is short:

That last point shows up again in CAN/ULC-S537-13 Clause 6.2.1, which requires each manual station to be inspected and tested to confirm operability, including that it is mounted with sufficient clearance to facilitate ease of access and proper operation.

So even if the raw height is correct, a bad surrounding layout can still become a real issue.

The one-line takeaway

If you only remember one thing, remember this:

In Ontario, the safest reading is not "pick 1200 or pick 1150." It is "follow S524's 1050-1150 mm centreline rule, and understand that its 1150 mm upper limit is there to keep the operating action within the OBC's 1200 mm barrier-free limit."

References

Working with Canadian fire and building codes? Ask Codebook Carl — answers are sourced directly from the code books with exact clause citations.