Manual Pull Station Symbol
Definition: The Manual Pull Station symbol represents a manually operated fire alarm initiating device — called a manual fire alarm box in NFPA 72 and a manual call point in EN 54-11 — drawn as a small square with a T-handle mark and two terminals (A, B) that connect it into a supervised initiating or signaling line circuit.
Also known as: manual fire alarm box, manual call point, fire alarm pull station, break-glass call point, manual station, fire pull box, MCP.
What the Manual Pull Station symbol means
The Manual Pull Station symbol denotes the human input to a fire alarm system: a wall-mounted device that lets any occupant initiate the alarm by pulling a handle (North American practice) or pressing/breaking a frangible element (European break-glass call points). Electrically it is simple — a switch contact behind terminals A and B — but its circuit context carries the meaning: on a conventional initiating device circuit (IDC) the station's contact closes across the supervised pair, shifting the circuit from its end-of-line-resistor supervisory current to an alarm signature; on an addressable system the station contains (or wires to) an addressable module that reports its specific identity over the SLC loop.
Unlike a detector, a pull station is deliberate and unambiguous — codes treat manual initiation as its own required layer of protection. NFPA 72 prescribes exactly where they go: within 1.5 m (5 ft) of each exit on every floor, mounted with the operable part 1.07–1.22 m (42–48 in) above the floor, and placed so travel distance to the nearest station never exceeds 61 m (200 ft). Once operated, the station latches mechanically and must be reset with a key or tool before the panel can be restored — which is also how responders identify which station initiated the alarm.
How to identify the Manual Pull Station symbol
The symbol is a small square (NFPA 170 uses a square with an 'F' or the manual-station pictograph in life-safety drawings) with a T-shaped handle mark and two wire stubs, A and B. On floor plans it appears beside exit doors; on riser diagrams it hangs off the IDC or SLC with its address or zone number annotated. The T-handle mark distinguishes the North American pull-lever design; European drawings show the EN 54-11 call point as a square with the cracked-glass diagonal or 'MCP' label.
Do not confuse it with a push-button symbol (general control, no fire-code meaning), an emergency stop (machine safety, mushroom head), or a firefighter's telephone jack. Single-action stations operate with one motion (pull); dual-action stations require two (lift a cover or push in, then pull) to reduce malicious false alarms — the schematic symbol is the same, with the action type noted in the device schedule.
Function in a circuit
Pulling the handle releases a spring-loaded mechanism that toggles the internal switch and latches the handle in the protruding 'activated' position. On a conventional Class B IDC, the closed contact shorts the supervised loop through the station, and the panel reads the changed current as an alarm from that zone. On addressable systems the integral module transmits the station's address, so the panel annunciates the exact location ('Manual station, east stairwell L3'). Reset requires opening the station with its key or hex tool, re-cocking the handle, and then resetting the panel — the alarm cannot be silenced away at the device.
Supervision covers the wiring rather than the switch itself: the panel detects opens and grounds on the circuit (via the end-of-line resistor on Class B, or the loop poll on addressable), so a cut wire annunciates trouble. Dual-action variants, protective covers with local sounders (e.g. Stopper-type covers), and tamper-evident glass rods address nuisance activation in schools and public spaces without reducing accessibility.
Standards: IEC vs ANSI
| IEC 60617 | In IEC/European practice the device is the manual call point per EN 54-11 (type A: single action/direct operation, type B: indirect operation after breaking glass), typically red per ISO 7010/EN 54 conventions; system placement follows national codes such as BS 5839-1 (e.g. call points on exit routes, 1.4 m mounting height). |
|---|---|
| ANSI/IEEE 315 | NFPA 72 governs manual fire alarm boxes in North America: within 5 ft (1.5 m) of each exit, operable part 42–48 in (1.07–1.22 m) above floor, maximum 200 ft (61 m) travel distance, listed to UL 38. Drawing symbols follow NFPA 170; building codes (IBC) determine where manual systems are required at all. |
| Key difference | North America favours pull-lever stations (single- or dual-action) mounted 42–48 in high near exits; EN 54-11 markets use break-glass/deformable-element call points, typically at 1.4 m. The circuit role is identical — a latching manual initiating contact on a supervised circuit — but listing regimes (UL 38 vs EN 54-11), operating gesture, and mounting heights differ. |
Terminals / pins
| Pin | Name |
|---|---|
| a | A |
| b | B |
Typical values
Contact ratings are pilot-duty small-signal values — typically 0.5–3 A at 30 V DC for conventional stations, switching only the IDC/SLC supervisory current (a few mA at 24 V DC in practice). Conventional Class B circuits use the panel's specified end-of-line resistor (commonly 2.2–10 kΩ); addressable stations draw one SLC address and roughly 0.3–1 mA standby loop current. Mounting: operable part 1.07–1.22 m (42–48 in) AFF per NFPA 72, within 1.5 m of exits, max 61 m travel distance; EN 54 markets commonly mount call points at 1.4 m. Housings are red with white lettering, single- or dual-action, keyed reset; wiring is typically 18–14 AWG FPL/FPLR fire-alarm cable.
Where the Manual Pull Station symbol is used
- Beside every required exit door and stairwell entry on each floor of commercial buildings (NFPA 72 placement rules)
- School corridors, where dual-action stations and protective covers reduce malicious false alarms
- Factory and warehouse egress routes, spaced so no point exceeds the 200 ft (61 m) travel distance
- Hotel and apartment building exits, tied into the addressable loop for exact-location annunciation
- European/IEC-market buildings as EN 54-11 break-glass call points on escape routes at 1.4 m height
- Assembly occupancies (theatres, halls) at attended locations and exits as required by the applicable building code
Example
In a conventional fire alarm riser, the Manual Pull Station symbol's A and B terminals are wired in parallel across zone 2's Class B initiating device circuit, downstream of three smoke detectors and ahead of the 4.7 kΩ end-of-line resistor. Pulling the T-handle latches the station and closes A to B, collapsing the circuit resistance so the FACP registers a zone 2 alarm and drives its NACs; the station handle stays out until reset with the key, telling responders exactly which device initiated.
Key facts
- NFPA 72 calls it a manual fire alarm box; EN 54-11 calls it a manual call point — both are latching manual initiating devices on a supervised circuit.
- Placement rules (NFPA 72): within 5 ft (1.5 m) of each exit, operable part 42–48 in (1.07–1.22 m) above floor, and no more than 200 ft (61 m) travel distance to the nearest station.
- The device latches mechanically when operated and requires a key or tool to reset — the alarm cannot be cleared at the panel until the station is physically reset.
- Single-action stations need one motion (pull); dual-action stations need two (push then pull, or lift cover then pull) to deter malicious activation.
- On conventional Class B circuits the station's contact alters the supervised end-of-line-resistor current; on addressable systems it reports a unique SLC address for exact-location annunciation.
- Circuit wiring — not the switch — is what is supervised: a cut conductor annunciates trouble at the panel even though the station itself is a simple contact.
- Stations are listed devices (UL 38 in North America, EN 54-11 in Europe) and are red with white lettering by convention.
- Manual stations are a code-required layer independent of automatic detection — occupants can initiate evacuation faster than a detector in many fire scenarios.
Frequently asked questions
How high should a fire alarm pull station be mounted?
NFPA 72 requires the operable part to be between 42 and 48 inches (1.07–1.22 m) above finished floor — a range that also satisfies ADA reach requirements. Stations must be within 5 ft (1.5 m) of each exit doorway on every floor, and positioned so no point on the floor exceeds 200 ft (61 m) of travel distance to reach one. European practice under BS 5839-1 mounts call points at 1.4 m.
What is the difference between a single-action and dual-action pull station?
A single-action station operates with one motion — pull the handle. A dual-action station requires two deliberate motions, such as pushing in a flap and then pulling, or lifting a hinged cover first. Dual-action designs and add-on protective covers (some with local warning sounders) are used where malicious or accidental activation is a problem, such as schools — at the cost of slightly slower operation.
What do the A and B terminals on a pull station connect to?
They connect the station's switch contact into the fire alarm initiating circuit. On a conventional system, A and B wire in parallel across the zone's supervised IDC pair (ahead of the end-of-line resistor); operating the station closes the contact and the panel reads the alarm signature. On addressable systems the pair connects to (or through) an addressable module on the SLC loop, which reports the station's unique address.
What happens after someone pulls a pull station — can it just be pushed back?
No. The handle latches in the activated position and the internal switch stays operated until the station is opened with its reset key or tool and the mechanism is re-cocked. Only then can the fire alarm panel be reset. This latching is deliberate: it prevents someone from covertly clearing an activation and shows responders which device initiated the alarm.
Is a manual call point the same as a pull station?
Functionally yes — both are manual fire alarm initiating devices. 'Pull station' is the North American device (UL 38, pull-lever, NFPA 72 rules); 'manual call point' is the EN 54-11 device used in Europe and IEC-aligned markets, operated by pressing a deformable element or breaking glass, typically mounted at 1.4 m. On drawings both appear as a small red square device on the initiating/loop circuit.
Related symbols
- Buzzer / Audible Alarm symbol
- CO Detector symbol
- Emergency Stop symbol
- Horn / Siren symbol
- Push Button NO symbol
- Smoke Detector symbol
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