BD Loops - Exit Loop - 4' X 6' or 3' x 7' Saw Cut Performed Loops with 50' Lead
The BD Loops BD-SC-20-50 is a Preformed Saw-Cut Loop made for existing concrete or asphalt where the loop path will be cut into the surface instead of buried below new pavement. The loop is preformed to 4 ft x 6 ft or 3 ft x 7 ft, also referenced as a 20 ft perimeter loop, and includes a 50 ft lead-in. This gives the installer a consistent loop shape and a cleaner lead-in path than field-wound wire. For gate systems, that consistency is important because the loop detector is looking for a stable inductance field. A damaged yoke, nicked jacket, poor sealant work, or incorrect loop size can show up later as false detections, no detection, or a gate that will not close correctly. This row should be used when the job calls for a saw-cut loop in an existing paved driveway, not a new direct-burial loop under fresh pavement.
This loop is commonly connected to a loop detector, not directly to the gate motor. The detector reads the inductive field from the loop and then sends the correct signal to the operator or access-control system. For exit/open loop use, the loop layout should be planned around the gate movement, driveway width, curb line, and vehicle path. A loop that is too small, too far from the travel path, or installed with the wrong lead length can create call-backs even when the detector and operator are working normally.
This is a saw-cut style loop for existing asphalt or concrete. BD Loops specifically cautions that saw-cut loops are not the normal choice for direct burial because the yoke can be crushed if it is buried without the proper protection method.
Compatible With
BD Loops are not normally tied to one single gate operator model. Compatibility is based on using the correct loop size, installation style, lead-in length, and inductive loop detector for the control system. This part may be used with select systems and applications such as:
- Automatic slide gate operators when connected through a compatible loop detector
- Automatic swing gate operators where the controller supports an external loop detector input
- Barrier gate operators and parking control systems using inductive loop detection
- Telephone entry systems, access-control panels, and relay interfaces that trigger a compatible gate controller
- Plug-in or stand-alone vehicle loop detectors from common access-control detector families when the detector specifications match the loop and site wiring
- Residential, commercial, and gated-community driveways where the loop size and lead-in length match the pavement layout
Common detector brands used in gate and parking work include EMX, Reno A&E, Diablo Controls, EDI, Nortech, and similar inductive loop detector families. Detector voltage, socket style, relay output, fail-safe/fail-secure setting, and operator input requirements must be checked separately.
Features & Specifications
| Manufacturer | BD Loops |
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| Product Type | Saw-cut inductive loop |
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| Part Number | BD-SC-20-50 |
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| Application | Exit loop vehicle detection |
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| Loop Size | 4 ft x 6 ft or 3 ft x 7 ft |
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| Loop Perimeter | 20 ft perimeter |
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| Lead-In Length | 50 ft |
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| Installation Type | Existing concrete or asphalt saw-cut groove, sealed with loop sealant |
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| Compatible Operator Type | Gate, barrier, garage, and access-control systems using a compatible inductive loop detector |
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| Wire / Construction Notes | 16 AWG copper loop wire with protective jacket; designed to fit in a 3/16 inch or wider saw-cut groove |
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| Included Components | Preformed loop with lead-in; saw-cut loops commonly include a built-in backer-rod style design depending on package/source |
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| Notes | Requires a properly matched loop detector or detector module; loop alone does not operate the gate |
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Also Known As / Related Part Numbers
- BD-SC-20-50
- SC-20-50
- BDSC2050
- SC 20-50
- SC20-50
- SC2050
- SC -20-50
- BD SC-20-50
- 20 ft saw-cut loop with 50 ft lead
- Related lead length: BD-SC-20-20
- Related lead length: BD-SC-20-100
Technician Note
For reverse/safety loops, size and placement are safety-related design decisions. The loop should protect the vehicle path without creating nuisance detection from nearby traffic, metal gates, drainage grates, or reinforcing steel. For exit loops, locate the loop far enough from the gate to allow the operator time to open before the vehicle reaches the gate area.
Before Ordering
- Confirm the installed loop type is saw-cut.
- Confirm the loop size is 4 ft x 6 ft or 3 ft x 7 ft and the lead-in length needed is 50 ft.
- Confirm the gate controller uses a compatible external loop detector or detector module.
- Check the driveway width and protected area before choosing a reverse/safety loop.
- Inspect the planned lead-in path so the wire reaches the operator, detector enclosure, or access-control panel without splicing in a wet or traffic area.
Professional Advisory
Vehicle loops are part of the gate control and safety design. Do not use a loop as a substitute for required monitored entrapment protection devices. For commercial gates, high-traffic properties, or any system with unsafe gate movement, have the installation reviewed by a qualified gate technician.
Questions & Answers
What is the BD Loops BD-SC-20-50 used for?
The BD-SC-20-50 loop is used for opening a gate automatically when a vehicle leaves the property or approaches from the exit side when it is connected to a compatible inductive loop detector and gate or access-control controller.
Will BD-SC-20-50 work with my gate opener?
It may be used with many gate, barrier, garage, and access-control operators as long as the system has a compatible loop detector input. Match the loop detector, controller input, lead length, and pavement layout before ordering.
Is BD-SC-20-50 for saw-cut installation?
Yes. This is a saw-cut preformed loop for an existing asphalt or concrete surface with a 3/16 inch or wider groove that is sealed after the loop is installed.
Does BD-SC-20-50 include the loop detector?
No. This product is the preformed loop and lead-in assembly. A compatible loop detector or detector module is still required to connect the loop to the gate operator or access-control system.
Can I substitute a different loop size or lead length for BD-SC-20-50?
Only if the site layout supports it. The loop size, detection area, lead-in distance, and controller location all matter, especially on reverse/safety loops that must cover the protected driveway path.
