What This Article Covers and Who It Helps
A magnetic lock kit bundled with a keypad, power supply, and request-to-exit button looks like a complete solution in the box. For contractors, facility managers, and security integrators, though, the kit is only the starting point. The decisions about fail-safe behavior, egress compliance, power supply placement, and keypad weatherproofing have to happen before the kit ships to the job site — not after the opening is framed and wired. This article walks through the sequencing mistakes that generate callbacks and failed inspections on mag lock kit installations.
What Is a Magnetic Lock Kit?
A magnetic lock kit combines an electromagnetic lock body, an armature plate that mounts to the door face, a power supply, and at least one access credential device — typically a keypad, card reader, or both. When power is applied, the electromagnet and armature bond together, holding the door closed. When power is interrupted — by a valid credential, a request-to-exit button, a fire alarm signal, or a power failure — the door releases. This is called fail-safe operation: the door opens on loss of power.
Holding force on commercial mag lock kits is typically rated between 600 and 1,200 pounds, depending on the application. A 1,200-pound unit is appropriate for high-traffic commercial entries, secured vestibules, and doors that see intentional push-out attempts.
The First Decision: Egress Compliance, Not the Keypad
The most common sequencing error on mag lock kit projects is selecting the credential device before confirming how the door will be legally released from the egress side. IBC Section 1010.1.9.7 and NFPA 101 Section 7.2.1.6.2 both govern electromagnetically locked egress doors. The core requirement is straightforward: occupants must be able to release the lock and open the door without a key, special knowledge, or unusual effort.
That means the request-to-exit (REX) device or built-in switch is not optional. It is a code requirement. The three common release methods are:
- Push-button REX: A listed push button on the egress side interrupts power to the lock. Simple and reliable for low-complexity openings.
- PIR motion sensor REX: A passive infrared sensor detects an approaching occupant and releases the lock automatically. Common in healthcare corridors and high-traffic interior doors where hands-free egress is needed.
- Switch in door hardware: Starting with the 2007 IBC Supplement, a listed switch built into the lever or pull hardware can directly interrupt lock power. This is the cleanest install when the door also carries a lever trim or panic device.
Specifying the keypad before confirming which REX method is code-compliant for the occupancy wastes time and can require rework after the authority having jurisdiction (AHJ) reviews the opening.
Fire Alarm Interface: The Wiring Step That Gets Skipped
On any fire-rated door or on any door in a fire alarm-monitored building, the mag lock must be wired to drop power automatically when the fire alarm activates. This is not optional and it is not handled by the kit’s internal power supply alone — it requires an interface between the fire alarm control panel and the power supply input.
If the opening is on a fire-rated assembly, an additional flag applies: the mag lock must be listed for use on fire-rated doors (look for UL 10C listing), and the overall opening must maintain its fire rating label. A mag lock that is not listed for fire-rated use cannot be installed on a labeled fire door, regardless of holding force.
Facility managers specifying mag lock kits for school corridor doors, hospital suite entries, or retail back-of-house exits should confirm fire alarm interface requirements with the electrical contractor and the AHJ before the kit is ordered. Discovering this requirement in the field after power is rough-in is an expensive conversation.
Weatherproof Keypads: Where the Outdoor Rating Decision Gets Made Late
Kits that include a weatherproof keypad are intended for exterior or semi-exposed applications — covered vestibule entries, loading dock access doors, industrial facility side exits, and school exterior doors with canopy coverage. The weatherproof designation on the keypad covers moisture ingress and temperature range, but it does not mean the lock body is rated for outdoor use.
Standard bracket-mounted electromagnetic lock bodies are typically rated for indoor use only. If the door is genuinely exterior — exposed to rain, condensing humidity, or freeze-thaw cycles — the lock body must be specified for outdoor use independently of the keypad rating. Outdoor-rated mag lock bodies use corrosion-resistant housings and are tested across a wider temperature range.
The failure mode when this distinction is missed: the keypad functions correctly for years while the lock body surface corrodes, the armature plate develops surface rust, and holding force degrades well below the rated specification. On an industrial facility or a school exterior, that degradation is a security liability that does not show up until an incident or an annual inspection.
Power Supply Placement and Wire Run Length
The power supply included in a bundled kit is sized for the lock body and typically one or two access control devices. Before installation, verify:
- Current draw totals: Add the lock body, keypad, REX device, and any door position switch. Exceeding the power supply rating causes unreliable operation and shortens component life.
- Wire run distance: Long wire runs between the power supply and the lock body create voltage drop. Consult the manufacturer’s wiring guide for maximum run lengths at the specified wire gauge. Industrial facilities and large school buildings with long corridor runs are where this problem surfaces most often.
- Power supply location: The power supply should be in a secured, accessible space — not in a ceiling plenum where a future HVAC contractor will relocate it without understanding the access control consequence. Many facility managers prefer the power supply in a dedicated electrical closet or the same IDF room as the access control panel.
Door Position Switch: The Component That Rounds Out the Kit
A door position switch (DPS) reports whether the door is physically open or closed to the access control system or alarm panel. Kits that include or are compatible with a DPS allow the system to detect propped-open doors, forced entry, or a door that failed to close after a credential release. In schools, this is increasingly an expectation from facilities directors and security consultants. In healthcare, a propped door on a secured suite is a patient elopement or infection control event.
If the kit does not include a DPS, confirm that the power supply and access control panel have a monitored input available before ordering. Adding it after installation means another conduit run and another reason to return to the site.
Preferred Hardware Lines for Mag Lock Kit Projects
DoorwaysPlus carries electromagnetic lock products and access control accessories from manufacturers with stable, service-friendly product lines. For credential devices, REX hardware, and access control integration components, lines from Sargent, Corbin Russwin, and Hager are well-suited to institutional and commercial mag lock projects. For the lock body and power supply components, Securitron (Magnalock family) offers a wide range of UL-listed units with automatic dual-voltage input that simplify field installation.
If you are specifying a mag lock kit for a project and need help confirming the right holding force, egress compliance path, or fire alarm interface method, the team at DoorwaysPlus can assist with product selection before the hardware schedule is finalized.
Summary: The Right Sequence for a Mag Lock Kit Installation
- Confirm egress release method (REX button, PIR, or switch-in-hardware) before selecting the credential device.
- Verify fire alarm interface requirements with the electrical contractor and AHJ early in design.
- Check whether the door is truly interior or exterior — the keypad weatherproof rating and the lock body outdoor rating are separate specifications.
- Calculate total current draw before committing to the bundled power supply capacity.
- Plan power supply location for long-term access and service, not just for the install day.
- Include a door position switch in the kit scope if propped-door monitoring is expected by the owner or required by the security design.