What This Article Covers
This guide is for contractors, security integrators, and facility managers who specify or install fail-secure electric strikes on fire-rated openings. Specifically, it addresses a decision that gets made too casually during access control scope writing: whether to connect the latchbolt monitoring output, the locking cam monitoring output, or both. Understanding what each signal actually reports — and what happens when neither is wired — is the difference between a compliant, auditable opening and one that passes rough-in but fails a fire door inspection or creates a liability gap down the road.
What Is a Fail-Secure Electric Strike?
A fail-secure electric strike is a frame-mounted device that holds the strike keeper in the locked (latching) position by default. Power is applied to unlock the keeper, allowing the door to swing open. When power is removed — due to a power outage, a tripped breaker, or a controlled fire alarm signal — the strike returns to locked, and the latch is positively retained in the strike pocket.
This behavior is what makes fail-secure strikes the only type legally permitted on fire-rated door assemblies. NFPA 80 requires positive latching on all labeled openings. A fail-safe strike, which releases on power loss, would leave the door unlatched during a fire event — defeating the rated assembly entirely. If you are specifying an electric strike for a fire-rated opening, fail-secure is not a preference; it is a code requirement.
Why Monitoring Outputs Exist on Commercial Electric Strikes
Higher-specification electric strikes carry more than just the locking mechanism. They include one or more auxiliary switches that report the state of internal components back to the access control panel or building management system. On a strike with both latchbolt monitoring and locking cam monitoring, you get two distinct signals that report two different physical conditions:
- Latchbolt monitoring tells the system whether the door latch is physically engaged in the strike pocket. A door that is closed but whose latch has not fully extended into the strike will trigger this signal. This is the confirmation that the door is actually latched — not just closed.
- Locking cam monitoring (auxiliary switch) reports the position of the cam or keeper mechanism inside the strike body. This confirms whether the strike is in its locked or unlocked position electrically and mechanically, independent of whether a latch is present.
Together, these two outputs give the access control system a complete picture of the opening: Is the door latched? Is the strike locked? A door position switch tells you the door is closed. These monitoring outputs tell you whether it is actually secured.
The Spec Decision That Gets Dropped
Here is the problem that appears repeatedly on commercial and institutional projects, particularly in healthcare, schools, and multi-building campuses: the hardware schedule specifies a monitoring-capable fail-secure electric strike. The access control contractor receives the strike, mounts it, and wires the power and the strike trigger line. The monitoring outputs — two additional wire pairs in most cases — are terminated to nothing, capped off, or left dangling in the wall box.
This happens for several reasons:
- The access control scope of work was written before the hardware schedule was finalized, and the panel input count did not account for two monitoring outputs per opening.
- The integrator treated the monitoring leads as optional features rather than part of the specified assembly.
- The general contractor closed the wall before the access control contractor confirmed termination points.
- The panel was sized for door position switch inputs only, and nobody re-scoped when the monitoring-equipped strike was substituted in.
The result is a fire-rated opening with a code-compliant fail-secure strike that is functionally operating as an unmonitored lock. The building owner has hardware capable of generating compliance-relevant signals. Nobody is receiving them.
Why This Matters More on a Fire-Rated Opening
On a non-rated opening, failing to connect monitoring outputs is a missed operational feature. On a fire-rated opening, the stakes are higher. NFPA 80 requires that fire door assemblies be inspected and maintained. Many AHJs and accreditation bodies — particularly in healthcare under Joint Commission review cycles — expect documented evidence that fire doors are latching properly. Latchbolt monitoring is one of the cleaner ways to generate that evidence automatically, flagging doors that are repeatedly failing to latch fully before the annual inspection reveals a pattern.
Additionally, on a 3-hour rated opening, the fire-rated listing covers the complete assembly as installed. An electric strike with monitoring outputs that are required by the hardware specification but left disconnected may be considered an incomplete installation by the AHJ, even if the strike itself is functioning correctly as a locking device.
What to Confirm Before the Rough-In Is Closed
If you are the installing contractor or the hardware specifier on a project with fail-secure electric strikes on fire-rated openings, confirm the following before the access control rough-in is finalized:
- Panel input count: Does the access control panel have sufficient inputs to receive both the latchbolt monitor and the cam monitor from each monitored opening? This needs to be confirmed against the panel spec, not assumed.
- Wiring run: Are the monitoring output leads being pulled to a termination point, or are they being capped in the strike box? A monitoring output that is never run to the panel cannot be connected after drywall is closed without a change order.
- Integration scope: Is the access control contractor's scope of work written to include terminating and programming the monitoring inputs, or only the locking circuit? Get this in writing before the scope is divided.
- Fire door inspection strategy: Does the facility manager or owner intend to use latchbolt monitoring data as part of their NFPA 80 compliance documentation? If yes, this needs to be part of the system configuration from day one.
Specifying the Right Strike for the Opening
Not every fire-rated opening requires a strike with both monitoring outputs. The specification decision should match the security and compliance requirements of the opening:
- Monitored fire corridor doors in healthcare: Full latchbolt and cam monitoring is defensible from a life-safety and accreditation standpoint. Specify accordingly and confirm panel capacity.
- Classroom and office entries in schools: Latchbolt monitoring is valuable here because doors in these environments are frequently propped or improperly latched. The monitoring output provides real-time feedback without physical inspection rounds.
- Industrial and warehouse fire doors with low-traffic access control: A simpler fail-secure strike with a door position switch may satisfy the requirement without the overhead of a dual-monitor input per opening — evaluate against the facility's compliance documentation requirements.
- Stair and cross-corridor doors in multi-story commercial buildings: These high-consequence fire-rated openings benefit most from latchbolt monitoring. A door that fails to latch at 3 a.m. should generate an alarm, not wait for the next inspection.
DoorwaysPlus carries fail-secure electric strikes from preferred commercial lines including Corbin Russwin, Hager, and Sargent, in configurations suited to fire-rated assemblies with monitoring outputs. If your project requires a specific voltage, finish, or monitoring configuration, the product descriptions will identify which auxiliary switch options are included.
The Finish Question on Stainless Steel Strikes
One practical detail that gets overlooked on fire-rated corridor and stairwell openings: finish consistency. Satin stainless (630/US32D) is a common specification on institutional and healthcare projects because it resists corrosion and cleans easily. When the hardware schedule calls for 630 on the lockset and exit device, the electric strike finish should match — not because mismatched finishes affect fire rating, but because an AHJ or architect doing a final punch walk will flag visible finish inconsistencies on labeled openings, and substitutions mid-project are harder to correct once the strike is mortised into the frame.
Summary
Fail-secure electric strikes on fire-rated openings are the right hardware choice. The monitoring outputs those strikes carry are not bonus features — they are tools for demonstrating compliance, catching latching failures before they become inspection findings, and giving the access control system a complete picture of the opening's state. Getting full value from that hardware means confirming panel capacity, running monitoring leads during rough-in, and defining integration scope before the wall closes. The strike does its job mechanically either way. Whether it does its job for your compliance program depends on decisions made before the drywall goes up.