Protecting Doors and Windows with Uneven Wiring Holes

Edwards Signaling 9/28/2018
Protecting Doors and Windows with Uneven Wiring Holes


It may happen, during installation, that holes are over-drilled, under-drilled, or have an uneven diameter. Oversized holes can occur due to difficulties in drilling, especially in tight quarters or enclosed spaces. Press-fit 3/8" (0.95 cm) diameter switches can actually fall out of over-sized holes even when they initially seem to fit well. This necessitates a costly service call and the use of adhesives (which take time to apply, and also increase service time should the switch need to be removed).

Additionally, many switches cannot withstand the pressure of green wood in new construction. Green wood dries and shrinks, damaging reed contacts.

Interlogix 1275 addresses these problems. Its flexible, collapsible wings surrounding the switch "barrel," accommodate smaller or larger holes, and cushion the reed. With a 1-1/4" (3.175 cm) gap, the 1275W also reduces costly time aligning the switch and magnet on loose-fitting doors and windows.


Decide on best placement of Sentrol switch in header or sill, and best position of magnet in door or window frame. Drill 3/8" (0.95 cm) diameter holes. Switch measures 1" (2.54 cm) long. The magnet is about 1-1/3" (3.39 cm) long.

Pull wire and connect to switch. Squeeze 1275’s "wings" and press fit switch into place. Then press fit magnet into its hole.

Test for continuity, then connect switch to loop.


1275, 1275W

Protecting Doors and Windows with Uneven Wiring Holes