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During a fault event, whether due to vandalism, theft, cable degradation, vermin damage, or water ingress, the analytics package can send an alert to the maintenance team via email, text, or automated phone call.


The CableGuardian units are the “eyes and ears” of the monitoring system. The unit is installed as part of a kit with the necessary measurement coil harness, power cable and communications antenna (if using cellular communications).

The unit can be powered from a domestic supply at 240V or 110V but it can also take its power from the 650V line being monitored, with the appropriate power cable being supplied by us depending on the option chosen. “Solid” or “split” measurement coil options are available.

Solid cores are used when the system can be down-powered to install the equipment. The split core can be installed around a live 650V cable. A second, smaller, split measurement coil is connected around a single core within the 650V cable to measure the line current. A functional earth connection is required for the CableGuardian unit to measure correctly. Note that this is not a protective earth as the unit is fully Class II certified.


The number of units depends on the Tier of monitoring as defined in NR/L2/SIGELP/27725 that is required by the asset owner and further for Tier 1 systems it also depends on the feeder layout and resolution of fault location desired. The more units installed in a Tier 1 system the better the resolution of Insulation resistance measurements. A unit in each location case will provide complete cable section level monitoring.

In a Tier 3 installation a single CableGuardian unit monitors all electrically connected feeders from a PSP. A Tier 2 system requires a single CableGuardian unit for each feeder. For a Tier 1 installation the maximum number of units required is equal to the number of location cases on all feeders in the same electrical circuit plus a unit for each feeder at the PSP, however complete cable monitoring is generally achievable without installing a unit in each location case. Please contact us with your system information and we will be happy to provide a CableGuardian system proposal to meet your individual requirements.


The CableGuardian system has configurable alarm and pre-alarm settings for the key parameters that are monitored, with the default settings being those contained within the Network Rail Standards. Alarm and pre-alarm settings are visually represented within the CableGuardian portal and are simultaneously sent to Network Rail’s Intelligent Infrastructure system using the current standard RS485 interface.

Additionally, Viper Innovations has worked collaboratively with Network Rail and has proven that this data can be directly passed from the CableGuardian Cloud to the Network Rail RADAR Cloud when this technology is released by Network Rail.

With CableGuardian you don’t have to wait for an alarm or even a pre-alarm in order to act and keep your Signalling Power System fully operational. It is possible to set alarm and pre-alarm values for each Sub-Network Section (this could be an entire feeder, part of a feeder, right down to an individual cable), which will also be visible within the portal.

By setting these Sub-Network Alarm Thresholds above the Network value it is possible to create an advanced warning of potential faults or long-term degradation long before they become an emergency.

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