A locked door is a security feature — until the moment the fire alarm sounds and it is standing between people and their escape route. Under the Regulatory Reform (Fire Safety) Order 2005, Articles 13 and 14 make the Responsible Person accountable for fire detection and for emergency routes and exits. In a building with electronic access control, those two duties meet at one specific piece of engineering: the interface that releases the doors when the alarm activates.

In our survey work across commercial estates, that interface is one of the most common — and most serious — failures we find. Not because anyone decided to cut a corner, but because access control and fire detection are usually bought, installed and maintained as separate systems, by separate contractors, on separate service contracts. Each system passes its own service visit. Nobody owns the join.

What the standard actually requires

BS 7273-4 is the British Standard for the actuation of release mechanisms for doors — the document that governs how electronically locked doors on escape routes must behave when the fire alarm operates. Its principles are simple and unforgiving:

  • Release must be independent of the access-control software. A software rule on the access-control server that says “unlock on fire signal” is not compliant actuation for escape-route doors. If the network is down, the server has crashed, or the panel relay never fires, the doors stay locked. Release must come from a hardwired fire alarm interface.
  • Release must be fail-safe. Doors must release on activation and must fail unlocked on fault or loss of power — never the other way round.
  • The signal path must survive the fire. Under BS 5839-1, fire alarm circuits — including interface circuits to door controllers — must run in fire-rated cable such as FP200. A release signal carried on Cat 5 data cable can fail in the first minutes of exactly the event it exists for.

Five questions for your own building

If your estate has access control, these five questions establish whether you have a compliance position or a liability:

  • 1. Does every access-controlled door on an escape route have a hardwired fire alarm interface — physically wired from the fire system, not dependent on software or network?
  • 2. Is the interface cabling fire-rated (FP200 or equivalent) for its whole run?
  • 3. Do the door power supplies have battery backup? A mains failure should never leave a door uncontrolled or locked on an escape route.
  • 4. Are there thumb-turn deadlocks fitted alongside maglocks? A mechanically engaged deadlock stays locked no matter what the maglock does — it defeats the fail-safe entirely and needs its own remediation.
  • 5. When was the cause-and-effect last tested door by door? Not the alarm test — the doors. Every interfaced door, physically checked to release on activation, with the result recorded.

Why service records miss it

The uncomfortable pattern: a building can hold years of clean fire alarm service certificates while its escape-route doors would not have released on any of those days. The alarm services test the alarm. The access-control services test the access control. Unless someone tests the release itself — and knows what BS 7273-4 requires of it — the gap sits invisibly between two healthy-looking maintenance files. We have seen service paperwork that recorded doors failing to release on activation, on the same visit the system was signed off as fault-free.

What good remediation looks like

The fix is rarely exotic: a door-by-door survey against the access-control asset register; hardwired interface units local to the door controllers; fire-rated cabling throughout; battery-backed supplies; the mechanical locking issues separated into their own workstream; and a witnessed, whole-site cause-and-effect test at the end — every door, physically proven, documented for the Responsible Person’s file. The result is release that works when the software does not.

If you cannot answer the five questions above for your building, a survey will answer them quickly — and give you the evidence either way. Start with our access control and fire systems teams, or talk to us about a door-release survey across your estate.