Fire-Rated Concealed Door Loop | Mortise-Mount Power Transfer | Flexible Steel Conduit

Provide a protected, tamper-resistant wiring path between the door frame and electrified door hardware with the SDC PT-5 Concealed Mortise Power Transfer Loop.

Designed by Security Door Controls (SDC), the PT-5 mounts into a mortised preparation in the door frame, keeping the flexible power-transfer loop concealed when the door is closed.

It provides a simple method of routing field-supplied wiring from the frame into compatible electric locks, exit devices, monitoring hardware, and other access-control components.

Unlike SDC's surface-mounted PT loops, the PT-5 is specifically UL 10C listed for 3-hour fire-rated door applications.

Key Features

• Genuine SDC / Security Door Controls

• Model PT-5

• Concealed mortise-mount power transfer loop

• Heavy-duty commercial construction

• Frame-mortised steel dust box

• Flexible steel power-transfer loop

• Approximately 3/8" inside diameter

• Chrome-finished loop assembly

• Concealed when the door is closed

• Provides protected wiring path from frame to door

• Designed for electrified locks and exit devices

• UL 10C Positive Pressure – 3 Hour

• Fire-door accessory application

• Supports door opening up to approximately 120°

• Recommended for hollow metal and compatible aluminum-frame applications

• Ideal for access control, retrofit, and new construction applications

Concealed Mortise Design

The PT-5 installs into the frame rather than remaining fully exposed on the surface.

When the door closes, the flexible steel loop retracts into the mortised housing, providing a cleaner and more protected installation than a conventional exposed armored door loop.

Benefits include:

• Improved tamper resistance

• Reduced exposed conduit

• Cleaner architectural appearance

• Protected field wiring

• Better suitability for secure commercial openings

Power & Data Transfer

The PT-5 provides a pathway for field-installed electrical conductors between the stationary frame and the moving door.

Typical applications include:

• Electrified mortise locks

• Electrified cylindrical locks

• Electrified exit devices

• Electric latch retraction

• Motorized latch retraction

• Electrified trim

• Request-to-exit devices

• Door-position monitoring

• Access-control circuits

• Other compatible low-voltage door hardware

The PT-5 is a wire pathway, so conductor type and quantity should be selected according to the connected device.

Flexible Steel Loop

The PT-5 uses a flexible steel loop designed to move as the door opens and closes.

SDC's current documentation identifies the loop at approximately:

0.35" to 3/8" Inside Diameter

This provides space for field-selected conductors while maintaining a compact concealed assembly.

Mortised Steel Dust Box

The PT-5 includes a steel housing designed to be mortised into the frame.

Overall housing dimensions are approximately:

• Height: 11-1/2"

• Width: 1"

• Depth: 3/4"

These dimensions should be verified against the existing frame preparation before installation.

Up to 120° Door Opening

SDC specifies the PT-5 for door movement up to approximately:

120°

Actual available opening angle depends on:

• Frame preparation

• Door geometry

• Installation location

• Wall clearance

• Adjacent hardware

• Conduit routing

The loop should never be stretched or pinched at the door's maximum opening position.

Fire-Rated Door Applications

A major advantage of the PT-5 over SDC's standard surface loops is its fire-door listing.

SDC identifies the PT-5 as:

• UL Listed Miscellaneous Fire Door Accessory

• UL 10C Positive Pressure compliant

• Suitable for 3-hour fire-rated door applications

• UBC 7-2 fire-test compliant according to current SDC literature

The complete door, frame, hardware, wiring, and installation must still comply with the requirements of the rated opening.

Product Specifications

Brand: SDC / Security Door Controls
Series: PT Series
Model: PT-5
Product Type: Concealed Mortise Power Transfer Loop
Mounting: Concealed Mortise
Housing: Steel Dust Box
Loop Material: Flexible Steel
Loop I.D.: Approximately 3/8"
Finish: Chrome
Housing Dimensions: 11-1/2" H x 1" W x 3/4" D
Door Opening: Up to 120°
Approximate Weight: 0.6 lb
Fire Rating: UL 10C, 3-Hour
Application: Electrified Commercial Doors / Access Control

Recommended Applications

Ideal for:

• Hollow metal doors and frames

• Compatible aluminum-frame openings

• Fire-rated commercial doors

• Access-controlled entrances

• Secure employee entrances

• Office buildings

• Schools and universities

• Hospitals

• Healthcare facilities

• Government buildings

• Warehouses

• Industrial facilities

• Institutional buildings

PT-5 vs. PT-2U / PT-3V

SDC PT-5

• Concealed mortise installation

• Flexible steel loop

• More tamper resistant

• Cleaner appearance

• Up to 120° opening

• UL 10C 3-hour fire-rated

SDC PT-2U / PT-3V

• Surface-mounted installation

• Exposed armored flexible conduit

• Easier retrofit installation

• Up to 180° opening

• PT-5-specific 3-hour fire listing does not automatically apply

For secure or fire-rated openings, the PT-5 provides significant advantages over a standard exposed surface loop.

Installation Notes

Before ordering or installing, verify:

• Door handing

• Door opening angle

• Frame construction

• Mortise preparation

• Available frame depth

• Required conductor count

• Required wire gauge

• Voltage

• Current draw

• Connected electrified hardware

• Fire-rating requirements

Protect wiring from sharp metal edges and avoid pinching, twisting, or placing excessive tension on the conductors as the door operates.

What's Included

(1) SDC PT-5 Concealed Mortise Power Transfer Loop