Liftmaster 50105 Coil Cord 4 Wire, 18 ga, 20 ft
The LiftMaster 50105 is a 4-wire, 18 gauge coil cord with a 20 ft extended length. It is used to maintain a flexible wired connection between a moving sensing edge and the fixed control-side wiring on compatible commercial door installations.
Common Applications
Commonly used on commercial door sensing edge systems that require four conductors. It may be used with select monitored and non-monitored edge arrangements when the edge, operator input, and wiring design call for a 4-wire cord.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Sensing edge coil cord |
| Part Number | 50105 |
| Wire / Conductors | 4 wire |
| Wire Gauge | 18 ga |
| Extended Length | 20 ft |
| Application | Commercial door sensing edge connection |
| Compatible Operator Type | Select commercial overhead, sectional, and rolling door operators |
| Notes | Match to the existing 4-wire edge connection before ordering |
Also Known As / Related Part Numbers
- 50105 coil cord
- 4-wire 18 ga 20 ft coil cord
- LiftMaster safety edge coil cord
Technician Note
Four-wire edge cords are not automatically interchangeable with 2-wire or 3-wire cords. The wiring method should match the sensing edge type and the operator input being used.
Before Ordering
- Confirm the existing cord has 4 conductors.
- Confirm 20 ft extended length is correct for the door travel.
- Check the door-side and wall-side junction points for corrosion or broken terminals.
- Verify whether the edge is monitored or non-monitored.
- Test the edge circuit after replacement.
Professional Advisory
Do not bypass a sensing edge to get the door running. If the operator will not close, reverses, or shows an edge-related fault after wiring work, stop and have the safety circuit checked by a qualified technician.
Product Q&A
What makes the LiftMaster 50105 different from 501042?
The 50105 is a 4-wire coil cord, while 501042 is a 3-wire orange coil cord. The correct choice depends on the edge and operator wiring.
Is this cord used on residential garage door openers?
It is mainly used for commercial door sensing edge connections, not standard residential wall control or photo eye wiring.
Can a 4-wire coil cord replace a 2-wire cord?
Not as a simple direct swap. The conductor count must match the edge circuit and operator wiring design.
What does the 20 ft length mean?
It refers to the extended length of the coil cord, giving the moving door enough travel without pulling the wiring tight.
Does replacing the cord fix every edge fault?
No. Edge faults can also come from the sensing edge, junction boxes, wiring terminals, or operator input settings.
