What This Article Covers
This guide explains how auxiliary monitoring works on fail-secure electric strikes installed on fire-rated door openings, why the monitoring portion of the spec is routinely omitted during value engineering, and what that gap means for facility managers, commercial contractors, and healthcare construction teams at inspection and over the life of the opening. If you are specifying or installing an electric strike on a 3-hour or lesser fire-rated door and the access control drawing does not show a feedback circuit, this article is for you.
What a Fail-Secure Electric Strike Actually Does
A fail-secure electric strike is an electromechanical device mounted in the door frame that holds the keeper (the moving jaw that captures the latchbolt) in a locked position when the device is unpowered. Applying voltage releases the keeper, allowing the door to be pushed open from the outside. The latchbolt itself remains extended at all times — the occupant always has free egress by operating the lever or exit device mechanically.
This behavior is the reason fail-secure strikes are the only electric strike configuration permitted on fire-rated openings. When power is cut — whether by a fire alarm drop, a power outage, or an access control system fault — the door defaults to locked with the latchbolt fully engaged. Positive latching is maintained. The fire listing survives.
Fail-safe electric strikes work in the opposite direction and cannot be used on fire-labeled openings. On a fire alarm drop, a fail-safe strike releases, destroying positive latching and invalidating the fire assembly.
Where Monitoring Enters the Picture
Many fire-rated electric strike models include an auxiliary switch that reports one or more conditions back to the access control panel or building management system. On a strike with full monitoring capability, the switch assembly can report:
- Latchbolt position — whether the bolt is projected and engaged in the keeper
- Keeper (cam) position — whether the keeper is in the locked or released state
- Door position — sometimes combined with a separate door position switch on the frame
The combination of latchbolt monitoring and keeper monitoring gives the access control system a complete picture of whether the opening is actually secure. A door that is physically closed but whose latchbolt is not engaged (held open by tape, a misaligned strike, or a damaged latch) will show as unlatched. The system can generate an alert before anyone discovers the gap during a fire inspection or a security audit.
Why the Monitoring Spec Gets Dropped
The pattern repeats across project types — schools, medical office buildings, hospital corridors, retail back-of-house. The original hardware schedule specifies a fully monitored fail-secure strike. During pricing, the access control subcontractor or the hardware supplier is asked to reduce cost. The monitoring auxiliary switch adds cost, the panel wiring and programming adds labor, and the feature is invisible to the eye. It gets cut.
The consequences are not immediately visible. The door latches. The electric strike releases on credential. The opening passes a casual walkthrough. What does not get tested at closeout:
- Whether a latchbolt misalignment will go unreported between inspections
- Whether a keeper that fails to return fully to the locked position triggers any alarm
- Whether the access control system can distinguish between a closed door and a latched door
On a fire-rated opening, that distinction is a code compliance issue, not just a security preference. NFPA 80 requires that fire door assemblies be maintained in a condition that provides positive latching. An unmonitored strike that develops a fault can remain out of compliance for months without anyone knowing.
The Access Control Drawing Gap
The monitoring auxiliary switch outputs a dry contact signal. Wiring that signal back to the panel requires it to appear on the access control riser or door schedule drawing. In many commercial projects, the electrical or low-voltage subcontractor works from a riser that was drawn before the hardware schedule was finalized. If the hardware schedule was later revised to remove monitoring, the riser may still show the circuit — or the riser may never have included it at all.
The field result: the strike arrives with a monitoring switch. The wire back to the panel is never pulled. The switch sits unused inside the device. Nobody at closeout checks whether the feedback circuit is connected and reporting, because the door latches and unlocks on credential just as specified. The monitoring function was specified, paid for in the device cost, and then never commissioned.
For healthcare construction teams, this is a meaningful gap. Life safety documentation for Joint Commission surveys and state health department inspections increasingly asks about door hardware monitoring status. An unconnected auxiliary switch that was specified on a fire-rated corridor door is a finding waiting to happen.
What to Verify Before the Opening Is Closed Out
Whether you are the hardware contractor, the access control sub, or the facility manager accepting the building, the following checks belong on the closeout checklist for every fire-rated electric strike with monitoring capability:
- Confirm the auxiliary switch type — is it reporting latchbolt position, keeper position, or both? The strike data sheet will identify the switch configuration.
- Verify the feedback circuit appears on the riser — check the as-built access control drawing against the device installed in the field.
- Test the signal at the panel — manually hold the latchbolt retracted and confirm the panel registers an alarm or alert state.
- Test the keeper return — after an access granted cycle, confirm the keeper returns fully to locked and the panel confirms latched state.
- Document the test results — for fire-rated openings, a written record of positive latching confirmation supports NFPA 80 maintenance compliance.
Specifying the Right Strike for a Monitored Opening
When a fire-rated opening requires a fail-secure electric strike with full auxiliary monitoring, look for devices that include both latchbolt monitoring and keeper or cam position monitoring in a single unit, rated for the door assembly fire classification. Common fire ratings for electric strikes used on fire-labeled openings include 3-hour, 90-minute, and lower classifications. The strike must carry a listing appropriate to the door label it is installed on.
Finish selection matters on monitored strikes for the same reason it matters on any stainless steel hardware specified for healthcare or high-humidity environments: a satin stainless finish provides corrosion resistance over the long service life of the opening without requiring the kind of maintenance cycles that chrome or painted finishes demand.
Preferred lines for electric strikes on monitored, fire-rated openings include products from Sargent, Corbin Russwin, Hager, and PDQ — lines with stable product architectures that support part-level service rather than full assembly replacement when a component needs attention.
The Takeaway for Each Role
- Architects and specifiers: Lock the monitoring requirement into the hardware section and cross-reference it to the access control section so it cannot be value-engineered out without a formal substitution request.
- Commercial contractors and access control subs: Treat the auxiliary switch feedback circuit as a required commissioned item, not an optional wire run. If the riser does not show it, raise an RFI before closeout.
- Facility managers: During annual fire door inspections required by NFPA 80, verify that latchbolt monitoring on electric strikes is active and reporting. An unconnected switch is not a compliant monitoring installation.
- Healthcare construction teams: Include electric strike monitoring commissioning in the life safety system acceptance test package. The auxiliary switch signal is part of the fire door assembly performance record.
DoorwaysPlus carries fail-secure electric strikes with auxiliary monitoring for fire-rated openings across a range of ratings and finishes. Contact us or browse our access control hardware to find the right device for your opening schedule.