Dual loop
Dual-loop is a method of electrical circuit termination used in electronic security applications, particularly modern
resistors. Its use became widespread in the early 21st century, replacing the basic closed-circuit system, mainly because of changes in international standards and practices.[1]
Dual-loop allows the
series with the first. This gives a reading of 4K ohms and will trigger an intruder alarm. If a resistance reading is not recognised by the system either due to short-circuit
or open-circuit, an anti-tamper alarm will trigger.
Dual loop is more commonly known as Balanced EOL (End of Line) resistors. It is more secure than the former Double Pole loop, but nevertheless can be bypassed by someone with sufficient knowledge of security alarm systems.
References
- ^ Mandatory UK standard Archived November 21, 2008, at the Wayback Machine