Camden CM-PT 18" Aluminum Endcaps Power Transfer Cables (Door Loops)

A door loop like the Camden CM-PT carries low voltage wiring from the frame across the hinge gap into the door leaf, so you can power an electrified lock, exit device, or request-to-exit switch mounted in the door. The armored cable flexes with every swing and protects the conductors from being pinched or cut at the hinge edge. It's surface mounted with an end cap anchoring at the frame and the other at the door.

Camden builds the CM-PT loops in 1/4 inch, 5/16 inch and 3/8 inch inside diameters. Pick by the bundle you're pulling: a couple of conductors for a strike or an REX switch fits the 1/4 inch, while an electrified lock run with several pairs, or a run you want spare capacity in for a future card reader, wants the 3/8 inch. Larger diameter also means a larger bend radius, so check you have room at the hinge gap.

Two anodized options on the aluminum end cap version: plain Aluminum and Duranodic, which is the dark bronze anodized tone used on most commercial aluminum storefront and curtain wall. Both are offered in 1/4 inch and 3/8 inch cable diameters. If you're matching dark bronze frames, Duranodic is the one.

Camden offers plastic, aluminum and stainless steel end caps across the CM-PT line. Aluminum, including the Duranodic dark bronze, is the usual choice on interior and storefront openings where you're matching frame color. Stainless suits exterior, coastal, or wash-down and high abuse areas. Plastic is the economy option for low traffic interior doors. The cable and end cap finish are ordered together, so decide both before you place the order.

A surface mounted loop like the CM-PT is the retrofit answer: no door or frame machining, you drill an entry hole and mount two end caps, and if a conductor fails you swap the loop in minutes. A concealed electric power transfer or an electrified hinge is cleaner looking and out of reach of vandalism, but it requires mortising both the door and the frame, which usually means pulling the door. On existing openings and on aluminum storefront, the surface loop is the practical call. Camden's aluminum and Duranodic caps keep it from standing out on a matching frame.

It's a commercial grade access control accessory. Camden lists the CM-PT power transfer cable as commercial, which is what you'd expect for a part living on an electrified opening cycled hundreds of times a day in an office, school, or multi-family entry.

You can standardize on the CM-PT family and vary only what the opening needs. Cable length is available from 7 inch to 18 inch and diameter in 1/4, 5/16 and 3/8 inch, with plastic, aluminum or stainless end caps. That lets a property manager keep one product line across interior and exterior openings while matching finishes, ordering the Duranodic aluminum caps on bronze storefront and plain aluminum on clear anodized frames.