The Decision That Looks Simple Until the Door Schedule Is Finished
This article is for commercial contractors, hardware consultants, and facility managers who are coordinating electrified openings on door pairs — particularly when access control, electric latchsets, or electrified exit devices are part of the hardware set. The electric hinge position question surfaces late in the schedule process, and when it is resolved too early without knowing the full lock spec, it tends to get revisited at rough-in.
What an Electric Hinge Actually Does in This Context
An electric hinge — sometimes called a power transfer hinge or concealed circuit hinge — carries low-voltage electrical current from the stationary frame side of the opening through the door leaf to the active hardware on the door. Instead of running a cord or conduit across the door gap, the circuit travels through the hinge barrel itself, concealed inside the knuckles.
On a single door, the position question is relatively straightforward: the electric hinge goes where the circuit needs to cross from jamb to door. On a door pair, the position question is more complicated because both leaves are active door surfaces, and each leaf may carry different hardware with different voltage and circuit requirements.
Why the Lock Schedule Has to Come First
The number and placement of electric hinges on a door pair depends on what hardware is mounted on each leaf. Before that question can be answered, the hardware schedule must confirm:
- Which leaf is active and which is inactive (or whether both leaves are active)
- Whether the active leaf carries an electrified exit device, an electric mortise lock, or an electric strike arrangement
- Whether the inactive leaf carries an automatic flush bolt with electric override, a magnetic holdback, or is entirely passive
- What voltage the powered devices require
- How many circuits (wires) each device needs
A heavy-weight electric hinge in the 4-1/2 by 4-1/2 inch range — the standard size for most commercial door pairs — is available in several circuit configurations. Ordering the wrong circuit count is a return trip. Once the lock schedule is confirmed, that count is not a judgment call anymore: it is arithmetic based on what each device requires.
The Active Leaf vs. the Inactive Leaf: Two Different Problems
Active Leaf
The active leaf typically carries the locking device — an electrified exit device with electric latch retraction, an electric mortise lock, or a cylindrical lock with an electric function. Power for that device has to travel from the frame, through the hinge, across the door, and reach the lock body on the opposite stile. That is a medium-length cable run inside the door — roughly 26 to 50 inches depending on door width — from the hinge location to the hardware on the strike side. The circuit count on the hinge has to match or exceed what the lock requires.
Inactive Leaf
The inactive leaf in an access-controlled pair often carries an automatic flush bolt with electric dogging or an electric override feature. When the inactive leaf has powered hardware, it also needs a power transfer path from the frame. This means a second electric hinge — on the inactive leaf jamb — with its own circuit count suited to that device. Many schedules miss this because the inactive leaf hardware gets treated as secondary and reviewed last.
In some configurations, the inactive leaf is entirely passive and carries no powered hardware. In that case, a standard heavy-weight ball bearing hinge of the same size and finish is correct for the inactive leaf, and no electric hinge is needed there. Confirming this before ordering prevents unnecessary cost on the inactive side while making sure the active side is fully spec'd.
Frame-Side Routing: Where the Cable Comes From
Power reaches the electric hinge from the frame side — typically routed up the hinge jamb inside the wall, often to a power supply above the ceiling. The length of that frame-side cable run matters. For a standard floor-to-ceiling run up the jamb, a cable in the 15-foot range is commonly used. For doors with full-lite or half-lite metal construction where internal routing is not possible, longer cable runs may be needed to go around the door perimeter.
The frame-side cable and the door-side cable are separate components. Both have to be specified, and both have to be accounted for in the hardware schedule before the rough-in stage. Once the frame is set and the walls are closed, adding conduit for a missed cable run is expensive and disruptive — a problem that shows up on healthcare construction projects and occupied school renovations in particular, where phased construction makes re-opening walls a significant cost event.
Finish Coordination on Door Pairs
On a door pair, both leaves are visible simultaneously. If the electric hinge on the active leaf is specified in one finish and the standard hinges on the inactive leaf are specified in another, the mismatch is obvious at punch list. For paired openings, the finish on the electric hinge — satin chrome, dark bronze, or whatever the project requires — has to match the standard hinges on the same opening. This sounds obvious but gets missed when electric hinges are quoted from one line item and standard hinges from another without cross-checking the finish codes.
The 26D satin chrome finish is among the most common in commercial interiors — office buildings, healthcare corridors, and institutional settings where a clean, neutral metal appearance is specified. Confirming that both the electric hinge and the standard hinges on the same pair share the same finish designation at order time avoids a visible mismatch that will be flagged at final inspection.
Where This Gets Compressed in the Field
On fast-track projects — retail build-outs, school addition work, medical office renovations — the hardware schedule and the door schedule are sometimes finalized under time pressure. Electric hinge decisions get made before the lock schedule is fully resolved because the door order has to go in. When that happens, the circuit count on the electric hinge is a guess, and guesses in this context generate re-orders.
The practical sequence that avoids this: lock and exit device selection first, circuit count from that selection, electric hinge ordered to match. That order cannot be reversed without risk. For project teams working under compressed timelines, flagging the electric hinge as a dependent item — dependent on the lock spec being finalized — keeps it from being ordered prematurely.
Preferred Hardware for These Openings
For commercial door pairs requiring power transfer hinges, DoorwaysPlus carries heavy-weight full mortise electric hinges from McKinney, Hager, and ABH Manufacturing in standard commercial sizes and common finish options. These lines offer stable product continuity and part-level serviceability — a relevant consideration when a building owner is looking at a 20-year service horizon on an electrified opening. Comparable options from Hager and McKinney are available for projects where the spec calls for a 4-1/2 by 4-1/2 heavy-weight product in a specific circuit configuration.
If your project includes electrified exit devices from Sargent, Corbin Russwin, or Hager, the circuit count coordination between the exit device and the transfer hinge is something DoorwaysPlus can help resolve before the order goes in.
Summary: The Right Sequence for Electric Hinge Placement on a Door Pair
- Confirm which leaves carry powered hardware and which do not
- Identify the circuit count required by each powered device
- Select electric hinges with the correct circuit count for each powered leaf
- Specify standard heavy-weight ball bearing hinges (matching finish) for passive leaves
- Account for both the door-side and frame-side cable runs before rough-in
- Confirm finish consistency across all hinges on the same opening
Getting this sequence right means the electrified opening works at final inspection instead of generating a punch list item that requires a return visit. Browse electric hinges and power transfer hardware at DoorwaysPlus.com to find the right configuration for your next project.