Summary

Manual call points are the simplest part of a fire alarm system — a switch that a person can activate to raise the alarm when they discover a fire. Despite their simplicity, MCP siting is governed by specific rules in BS 5839-1 that installers must apply correctly. An MCP that cannot be reached within 45 m along the escape route, or that is mounted out of reach, or that is hidden behind a door, is a non-compliance.

The 45-metre travel distance rule is measured along the actual escape route — not as a straight-line distance on a floor plan. In buildings with complex layouts (multiple corridors, stairwells, lobby areas), the measurement must follow the route a person would actually take to reach the MCP. This distinction matters in buildings with non-direct floor plans.

MCP placement is also important for false alarm management — incorrectly located call points that are frequently accidentally operated, or placed in areas accessible to children or vulnerable people, require countermeasures such as dual-action design or break glass guards.

Key Facts

  • BS 5839-1:2017 Clause 20 — the specific clause governing manual call point siting
  • Maximum travel distance — 45 m from any point in the building to the nearest MCP, measured along the escape route
  • High-risk areas — 30 m maximum travel distance in areas with high fire risk
  • Storey exits — at least one MCP must be sited at every storey exit (exit to stairwell, exit to external escape route)
  • Final exit — at least one MCP adjacent to every final exit from the building
  • Mounting height — 1.4 m above floor level to the centre of the call point faceplate; range 1.2–1.5 m acceptable
  • Accessibility — must be accessible to wheelchair users; in accessible buildings ensure the 1.2–1.5 m height range is met and no obstruction exists in front of or below the MCP
  • Visibility — MCPs must be visible and easily located; red colour is standard; BS EN 54-11 requires red body and red LED indicator
  • BS EN 54-11:2001+A1:2005 — the component standard for manual call points; performance, construction, and marking requirements
  • Dual-action MCPs — require the user to lift a cover or flip a guard before breaking the glass; recommended in BS 5839-1 Annex C for care settings and where accidental/malicious activation is a risk
  • Break glass element — typically a glass or plastic element that must be broken to activate; glass element requires replacement after each activation; some resettable MCPs avoid this
  • Key-operated resettable MCP — activated by breaking glass or a push-button beneath a cover; reset with a key; used in mental health units where detachable glass fragments are a risk
  • Conspicuous location — MCPs at storey exits should be positioned so an escaping person sees them naturally as they approach the exit
  • Internal vs external exits — at each internal storey exit (e.g., door from office floor into stairwell) and at each external final exit (door from building to outside)

Quick Reference Table

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Location Type Maximum Travel Distance Minimum MCPs
General areas (offices, warehouses) 45 m along escape route 1 per 45 m segment of escape route
High-risk areas 30 m along escape route 1 per 30 m segment
Each storey exit N/A (mandatory regardless of distance) 1 at each exit
Each final exit N/A (mandatory regardless of distance) 1 at or adjacent to exit
Basements / below-ground 30 m recommended 1 per storey level + exit
MCP Type Best Use False Alarm Risk
Standard single-action General offices, warehouses, retail Low (but present for malicious)
Dual-action (guarded) Schools, mental health, public areas Very low
Key-resettable Mental health secure units, high-malicious risk Very low
Addressable MCP All addressable systems Per type above

Detailed Guidance

Measuring the 45-Metre Travel Distance Correctly

The 45-metre rule is measured along the actual escape route, not as a direct (crow-fly) measurement on a plan. This distinction matters significantly in buildings with compartmentalised layouts.

Correct measurement method:

  1. Identify all escape routes in the building (marked on the fire exit signage plan)
  2. From any point in a space, trace the actual walking path to the nearest MCP along the escape route
  3. Measure that walking path distance
  4. If any point in the space exceeds 45 m (or 30 m in high-risk areas), an additional MCP is required

Common measurement errors:

  • Using direct-line distances on a plan and underestimating actual walking distances in corridors that bend
  • Forgetting that measurements must be to the nearest MCP — an MCP 40 m away in one direction doesn't satisfy the rule if the escape route requires going the other way
  • Ignoring that locked doors, turnstiles, or security barriers effectively lengthen the travel distance

For complex floor plans, it is worth using a red pen and physically tracing routes on the drawing for each MCP location — the visual approach catches layout-driven problems that measurements on spreadsheets miss.

Placement at Storey Exits and Final Exits

Storey exits: Every door or opening that provides access between a floor and a protected stairwell, lobby, or other means of vertical escape must have an MCP. This is because the stairwell is the protected escape route — a person leaving the floor and entering the stairwell should be able to raise the alarm as they leave.

Position the MCP on the floor side of the exit door — at the door's latch side (the side where the door handle is), at 1.4 m height, visible from the approach direction. The person should see the MCP naturally as they approach the door to exit.

Final exits: Every door from the building to the outside at ground level (or other means of final escape to a place of safety) must have an MCP adjacent to it. Position on the inside of the door, latch side, 1.4 m height.

In a typical 4-storey office building with two stairwells and two final exits, the minimum number of MCPs from the exit requirement alone would be:

  • 4 floors × 2 stairwell exits per floor = 8 MCPs at storey exits
  • 2 final exits = 2 MCPs at final exits
  • Total minimum = 10 MCPs, plus additional MCPs to meet the 45-metre travel distance requirement within each floor

Height and Accessibility Requirements

Standard mounting height: 1.4 m above finished floor level, measured to the centre of the MCP faceplate. This places the activation point (break glass or button) between 1.3 m and 1.5 m depending on the design of the specific MCP.

Acceptable range: BS 5839-1 states 1.2–1.5 m is acceptable. The midpoint of 1.4 m is preferred. Avoid mounting above 1.5 m — it may be difficult for shorter people or wheelchair users to reach.

Wheelchair user access: In premises that must comply with the Equality Act 2010 and BS 8300:2018 (design of accessible buildings), MCP activation must be within reach of a person using a wheelchair. Maximum reach from a wheelchair is approximately 1.2–1.5 m sideways and 1.2 m overhead — the standard MCP range accommodates wheelchair users provided no obstacle (radiator, shelf, door swing) blocks side access.

Tactile recognition: In some healthcare and educational settings, tactile markers adjacent to the MCP assist visually impaired occupants in locating it. This is recommended good practice, not a BS 5839-1 requirement.

Dual-Action MCPs in Care Settings

A standard single-action MCP is activated by breaking the glass with a single blow (typically a push of the fist or a finger). In settings where accidental or unintentional activation by residents, patients, or children is a concern, dual-action MCPs provide a physical barrier.

How dual-action works:

  1. User lifts a plastic cover (like a hinged flap) or flips up a guard
  2. The break glass or button is exposed
  3. User breaks glass or presses button to activate

The two-step process prevents casual or accidental activation without meaningfully impeding a genuine emergency activation — the additional action takes less than 2 seconds.

Settings where dual-action is recommended (BS 5839-1 Annex C):

  • Dementia care homes — residents may activate MCPs without understanding the consequence; dual-action provides a physical barrier that is effective against unintentional use
  • Mental health inpatient units — risks of deliberate false activation; dual-action deters opportunistic activation
  • Schools and colleges — high risk of malicious activation by younger students; dual-action significantly reduces this
  • Public areas with high footfall — shopping centres, transport hubs where casual activation risk is elevated

Key-resettable MCPs in mental health settings: In secure mental health units and similar environments, glass fragments from a standard break-glass MCP present a risk (glass as a weapon or self-harm tool). Key-resettable MCPs use a button or lever beneath a cover — activation does not produce glass fragments, and resetting is done by a member of staff with a key rather than replacing glass. Always verify with the fire safety officer and the building's clinical risk assessment whether standard or key-resettable MCPs are required.

Dual-action does not reduce alarm capability: BS 5839-1 is clear that the two-step action must not impede a genuine emergency activation. The cover lift force should be minimal (easily performed by children and elderly people). Test at commissioning by attempting activation with one hand — if the action requires unusual dexterity or force, the MCP is not suitable.

Labelling and Signage

MCPs must be clearly identifiable. BS EN 54-11 requires the call point body to be red. The words "FIRE ALARM" or "FIRE" in white or yellow text on a red background are standard. In multi-lingual environments, consider supplementary signage in the main languages of the occupants.

For addressable systems, each MCP must also be labelled with its zone identifier and device number, matching the system documentation. This label is typically applied to the back-box or base, not the visible faceplate — it is for maintenance and commissioning purposes, not for users.

In buildings with a fire brigade mimic panel or zone indicator board, the MCP zones must correspond to the zone labels on the mimic. Correct labelling allows the attending fire crew to correlate the call point activation with the zone display.

Common MCP Siting Errors

  1. Inside a room — MCPs placed inside a room (rather than in the corridor at the room's exit) mean an occupant may have to re-enter the building to reach the MCP, defeating its purpose
  2. Behind a door — MCP hidden by a door's swing arc is effectively inaccessible; site on the latch side, clear of the door's travel
  3. Above 1.5 m — common when MCPs are mounted on structural columns at higher heights; always verify actual installed height
  4. Not at the storey exit — the storey exit MCP is sometimes omitted if the travel distance from within the floor is already satisfied; this is incorrect — the storey exit MCP is mandatory regardless of travel distance
  5. Painted over — maintenance teams sometimes paint over MCPs with wall paint; the red colour and any text are obscured; flagging this at maintenance visits is important

Frequently Asked Questions

Do MCPs need to be in every room?

No. MCPs are sited in escape routes and at exits, not in every occupied room. The 45-metre travel distance rule is measured along the escape route, not within each individual room. An MCP in the corridor serving a suite of rooms satisfies the travel distance requirement for all those rooms, provided the travel path from any part of the suite to the MCP along the escape route is within 45 m.

Should MCPs be sited on staircase landings?

Yes, in most cases. Stairwells are part of the escape route and may be a location where someone discovers a fire. In a multi-storey building with a stairwell, MCPs should be provided at each floor landing within the stairwell (or at the entry to the stairwell from each floor, which is equivalent). The travel distance from any part of the stairwell to an MCP should also be within 45 m, which in most buildings means one per landing.

Can an addressable MCP be used in a conventional system?

No. Addressable MCPs communicate digitally with the panel using the loop protocol. Conventional MCPs use a simple contact closure. They are not interchangeable. Using an addressable MCP on a conventional circuit will not activate the circuit; using a conventional MCP on an addressable loop will not communicate device identification information.

What is the action if an MCP glass is broken maliciously?

Replace the glass element (supplied by the MCP manufacturer; typically a simple clip-in cartridge). Reset the panel. Check adjacent CCTV for identification of the person responsible. Log the event in the fire alarm maintenance log. If malicious activations are recurrent, discuss with the responsible person whether dual-action MCPs are appropriate for the affected locations.

Is there a minimum number of MCPs per zone?

No specific minimum per zone, but the travel distance rule effectively sets a minimum for the whole building. Zone design and MCP placement should be considered together — zones that contain storey exits naturally get at least one MCP; travel distance calculations fill in any gaps.

Regulations & Standards

  • BS 5839-1:2017 Clause 20 — siting of manual call points; travel distances, heights, positions

  • BS EN 54-11:2001+A1:2005 — manual call points; performance and construction requirements; defines single-action and dual-action types

  • BS 5839-1:2017 Annex C — false alarm management; dual-action MCPs in care settings

  • Equality Act 2010 — accessibility requirements affecting MCP mounting height and approach access

  • BS 8300:2018 — design of accessible and inclusive buildings; reach range requirements

  • Regulatory Reform (Fire Safety) Order 2005 — responsible person's obligation to ensure adequate means of giving warning

  • BS 5839-1:2017 — BSI standard; Clause 20 manual call point siting

  • FIA Manual Call Point Guidance — Fire Industry Association guidance on MCP selection and placement

  • Hochiki MCP Product Documentation — Example manufacturer data including dual-action MCP specifications

  • BS EN 54-11:2001+A1:2005 — BSI component standard for manual call points

  • Care Quality Commission Fire Safety Guidance — CQC guidance on fire safety in care homes; relevant to dual-action MCP requirement

  • bs 5839 1 fire alarm standard — The standard governing MCP siting requirements

  • fire alarm categories l1 l5 m — Category selection determines MCP coverage requirements

  • fire alarm zoning design — Zone boundaries that MCPs trigger

  • fire alarm false alarm management — Dual-action MCPs as a false alarm management tool

  • fire alarm commissioning procedure — MCP testing as part of commissioning