Product Overview

The SIS Underground: Electrical Disconnection System is an electrical disconnection system specifically designed for the isolation of individual illuminated columns. Each pole or column is fitted with a small sensor that, in the event of an impact, communicates with the monitor board, triggering complete Low Voltage (LV) and Extra Low Voltage (ELV) isolation within 0.2 seconds. The SIS Underground unit is housed within an IP67 enclosure and located on an equipment shelf inside an underground STAKKAbox™ Access Chamber, near the column it is protecting. The system is fully compliant with EN12767:2007 (Electrical Isolation of Passively Safe Structures) and can be used with any type of passively safe column. It has been developed as an alternative for designers who require guaranteed disconnection at a comparable cost to installing plugs and sockets.

Key Benefits

• Guaranteed electrical isolation of all volts within 0.2 seconds of impact.
• Fully compliant with EN12767:2007 (Electrical Isolation of Passively Safe Structures).
• Successfully tested at MIRA.
• Disconnection time officially proven with a timing device.
• Suitable for use with NE, LE, and HE Passively safe columns.
• Appropriate for use in non-passive columns.
• Guaranteed isolation even if the structure has not detached from its base.
• Isolates all volts even if the impact sensor is destroyed.
• Provides isolation of individual structures or circuits.
• Provides fault outputs for impact, voltage drop, and other potential maintenance issues.
• Fault outputs can be connected to CMS or RMS systems.
• Automatic restart and recheck after power failure.
• Impact sensors easily replaced after impact.
• Simple means of re-energising the circuit while the impacted structure remains isolated.
• Enables simple isolation of individual columns for maintenance works.
• Simple to test periodically.

Applications

• Street Lighting Columns.
• Illuminated Signs.
• CCTV Columns.

Features & Construction

• SIS Solo-E monitor unit activates complete LV and ELV (Zero Volt) isolation.
• Unit housed within an IP67 enclosure.
• Installed on a removable shelf inside an underground STAKKAbox™ Access Chamber.
• Assembled to customer requirements to take a range of cable sizes from 6.0mm to 25mm 4 core SWA.
• Units come pre-wired with 5 metres of flex (longer lengths can be supplied).
• Impact sensor ensures the system can be fully tested simply by disconnecting the plug attachment on the sensor.
• All equipment is CE and environmentally tested in accordance with TR2130.

Technical Specifications

Property	Details
Compliance	EN 12767: 2007, CE, TR2130C/BS 7987 (Environmental Testing), EN50293:2000 (EMC Testing)
Isolation Speed	Within 0.2 seconds (guaranteed), within 0.4 seconds (to individual structure and all components within IP67 enclosure)
Enclosure Rating	IP67 (for SIS Underground unit)
Sensor Cable Distance	System can operate with impact sensor located 3km from SIS monitor board
Cable Size Compatibility	6.0mm to 25mm 4 core SWA
Outputs	Sensor: 24v DC, Shunt Trip: 24v, 10A Double Pole circuit breaker (outgoing supply), 1A Fuse (SIS Solo-E supply)
Terminals	DIN Terminals for loop in loop out, 16 to 35mm DIN terminals

Installation & Maintenance

• The SIS Underground unit is located within an underground STAKKAbox™ Access Chamber, near the column it protects.
• Supply cables are terminated within the enclosure using IP68 brass cable glands.
• A pre-fitted rubber flex for supply and a one-pair orange flex for the sensor connect to the structure.
• Impact sensor ensures full system testing at commissioning by disconnecting its plug attachment.
• Installation is simple to test and prove prior to commissioning.
• Can be supplied with IP68 in-line plugs and sockets.
• Other customer specific requirements such as a transformer or spur supply can also be provided.