What This Article Covers and Who It Helps
A magnetic lock kit bundled with a keypad, power supply, and push button looks like a complete solution right out of the box. For many interior access-controlled openings, it is. But when that same kit lands on a weather-exposed door — a loading dock entrance, a school exterior vestibule, a healthcare campus perimeter gate, or an industrial yard entry — the installation decisions multiply fast. This article walks contractors, facility managers, and project architects through the system-level details that routinely get missed between the submittal and the rough-in: power routing, egress device placement, fire alarm interface, and the code requirements that apply specifically to electromagnetically locked egress doors.
What a Maglock Kit Actually Includes — and What It Does Not
A standard 1,200 lb magnetic lock kit for commercial use typically bundles the electromagnetic lock body, an armature plate that mounts on the door face, a power supply, a weatherproof keypad for credential entry, and a request-to-exit (REX) push button for egress. That is a functional access-controlled opening in one package.
What the kit does not include — and what the installer must plan separately — is the following:
- Fire alarm interface relay — required by code to drop power to the lock on alarm activation
- Door position switch (DPS) — needed if the access control system must log or report door-held-open conditions
- Conduit runs and junction boxes suitable for a wet or damp location rating
- Egress signage for the push button, which must read PUSH TO EXIT per IBC and NFPA 101
- Bonding and grounding for the lock body in any outdoor metal frame application
Sorting these items out at the submittal stage, not during inspection, is where projects save time and money.
The Egress Side: Code Requirements That Drive the Layout
Electromagnetically locked egress doors are specifically addressed in IBC Section 1010.1.9 and NFPA 101 Section 7.2.1.6.2. Both codes converge on the same core requirements for the egress side of an access-controlled opening:
- A sensor or listed manual release device on the egress side that unlocks the door upon approach or upon activation
- The manual release (push button) must be located between 40 and 48 inches above finished floor, within 5 feet of the door
- The push button must be labeled PUSH TO EXIT
- Activation of the push button must directly interrupt power to the lock — not route through a CPU or controller that could delay the release
- The door must remain unlocked for a minimum of 30 seconds after the push button is activated
- Loss of power to the access control system must automatically unlock the door (fail-safe behavior)
- Fire alarm activation must unlock the door and keep it unlocked until the system is manually reset
On a simple interior opening, these requirements are easy to satisfy with the REX button included in the kit. On an outdoor opening, the placement and enclosure of that button becomes a weatherproofing and vandalism question as much as a code question.
Interior vs. Outdoor Push Button Placement
The REX button in a standard kit is typically designed for interior use. At a weather-exposed door, you need a button rated for the environment: at minimum a NEMA 3R or NEMA 4 enclosure for a sheltered exterior location, or NEMA 4X where washdown or salt air is a factor. Industrial facilities, food processing plants, and coastal healthcare campuses all encounter this. Specify the right enclosure before rough-in — retrofitting a properly rated junction box after drywall and framing is closed is a change order.
Power Supply Location and Voltage Drop
A 1,200 lb electromagnetic lock draws meaningful current — typically in the range of 250 to 300 milliamps at 12 VDC, or around 150 milliamps at 24 VDC, depending on the specific unit. Most kit power supplies are sized for a single lock at short wire runs.
At outdoor openings, the power supply almost always lives indoors — in an electrical room, a telecom closet, or an access control head-end panel. That means wire runs are longer. Longer runs mean voltage drop. Voltage drop on a maglock circuit means the lock does not reach its rated holding force, or the power supply works harder than its design point.
Key practices to address this in the field:
- Calculate voltage drop for the actual wire run length, not the kit's default assumption
- Upsize conductor gauge where runs exceed 50 to 75 feet at 12 VDC
- Consider specifying 24 VDC operation where available — half the current draw means half the voltage drop for a given wire gauge
- Confirm the power supply included in the kit is rated for the actual wire run, or specify a separate panel-mounted supply with adequate capacity
Fire Alarm Interface: The Step That Gets Skipped on Smaller Projects
On large commercial or healthcare projects, the fire alarm contractor and the low-voltage access control contractor typically coordinate the interface relay as a matter of course. On smaller retrofit projects — adding a keypad and maglock to a school's exterior door, for example — this coordination step is frequently skipped.
The result is an electromagnetically locked egress door that will not release on fire alarm. That is a life-safety deficiency and a failed inspection, and it exposes the facility to liability that dwarfs the cost of the relay.
The fire alarm interface is straightforward: a dry contact relay, triggered by the fire alarm panel, interrupts the power circuit to the lock. The relay must be connected such that it operates independently of the access control system's software. Most kit power supplies include a terminal block for this relay input — confirm it is wired before the system goes live.
What the AHJ Will Check at Inspection
Inspectors reviewing access-controlled openings under IBC Section 1010 or NFPA 101 Section 7.2.1.6 typically verify the following at the door:
- Push button is present on the egress side, properly labeled, and at the correct height
- Push button releases the lock immediately (no software delay)
- Cutting power to the system releases the lock
- Fire alarm activation releases the lock
- The lock is listed per UL 294
Some inspectors will also verify that the lock is fail-safe — meaning power-off equals door-unlocked — and that this behavior is not overridden by the access control system configuration. Confirm this at commissioning, not at inspection.
The Keypad Side: Weatherproofing Is Not Optional
Kits designed for outdoor use include a weatherproof keypad for a reason. In cold climates, membrane keypads can fail at low temperatures. In humid or coastal environments, corrosion attacks contacts and circuit boards. In high-traffic commercial or institutional settings, vandalism is a real factor.
When specifying or procuring a maglock kit for an outdoor opening, confirm the keypad's ingress protection rating for the actual environment. A keypad rated for damp locations on a fully exposed loading dock entry is a warranty call waiting to happen. If the credential device will be used in a covered but cold vestibule — common in school and healthcare main entries — confirm the operating temperature range of the keypad and the reader together.
Getting the Hardware Set Right the First Time
A magnetic lock kit with a keypad, power supply, and push button covers the core access control function. Completing the opening correctly means planning for the fire alarm relay, confirming push button placement and enclosure rating, sizing the power supply for actual wire runs, and ensuring the whole system behaves fail-safe on power loss.
These are not afterthoughts — they are the details that determine whether the opening passes inspection and performs reliably over time. DoorwaysPlus carries magnetic lock kits, power supplies, request-to-exit devices, and access control hardware suited to commercial, institutional, and industrial applications. Our team can help you identify the right components for your specific opening conditions before the project reaches rough-in.