• • • ENCLOSURES • • •


Enclosure for uncut tap cable installation enhanced with fire protection


Spelsberg’s Rapid-Box industrial enclosure for fast and safe tap conductor installation is now available in a fire-resistant version for use in tunnels and similar environments, says Chris Lloyd, managing director, Spelsberg UK


W


KE Rapid-Box HT removes the need for electrical installers to cut the supply cable when fitting cable taps and


additional sockets. The new features mean that the enclosure


provides electrical functional integrity for up to 90 minutes in the event of a fire, enabling safety systems to continue to operate. Rapid-Box is now also available in a heavy-duty version for uncut cables up to 50mm². WKE Rapid-Box HT enables fast installation


of cable taps and sockets from an existing power cable in tunnel applications including road, rail and pedestrian walkways. This design saves significant time and cost compared to installing a new supply cable, while maintaining safety throughout. After ensuring that supply to the main cable


is powered off, Rapid-Box is placed around the cable. The electrical installer only has to remove the supply cable’s outer sheath and the


individual wires are then fitted into the corresponding terminals. The terminals are spring-loaded, which provides


improved security and reliability against vibration compared to conventional screws, particularly for rail and road tunnel applications. The copper or aluminium conductor wire is


exposed at the contact points and Rapid-Box is then safely sealed, providing Protection Class II and meeting European approval as a switching device according to EN 61439. A PE contact can also be installed for external earth insulation. A cable tap can then be safely installed to


provide a local power supply, or a branch off with an external socket can be fitted. Rapid-Box can also be used as a connector for two cut cables. Rapid-Box is rated to an operating voltage of 400 V and offers maintenance-free service long-term. WKE Rapid-Box HT can be used in high


temperatures and is able to withstand up to 1,000°C.


As applies to Spelsberg’s WKE enclosure


range, WKE Rapid-Box HT ensures that fire alarm systems and emergency lighting are maintained for at least 30 minutes in the event of a fire, while pressure boosting systems for extinguishers, as well as ventilation systems, continue for at least 90 minutes. The polycarbonate enclosure provides high


resistance to impact, achieving the IK08 rating, and can withstand high power water jets as the box is tested to IP66/67. The new fire-resistant connection enclosures are


available in four variants, including clamping for uncut cables with cross sections between 2.5mm² and 25mm², as well as a larger unit that can accommodate uncut cables between 16mm² to 50mm². Both sizes are available in three and four pole options. The standard version of Rapid-Box, available in


grey compared to the WKE’s orange finish that signifies fire protection, can now also accommodate heavy-duty cables up to 50mm² cross section. Designed with anti-corrosion protection, Rapid-Box enables fast and safe power supply for industrial applications including ports and dockyards, as well as construction sites. Rapid-Box is a fast and safe way to establish a


power connection. With the new WKE version, the connection enclosures provide functional safety for tunnel applications in the UK, such as tunnels on the overground rail service, as well as underground networks, and roads. It’s also ideal for use in passenger walkways, such as those underneath large buildings, exhibition halls, and urban area. Spelsberg UK provides installation design and


specification and can customise any of its enclosures as well as provide bespoke options.


electricalengineeringmagazine.co.uk ELECTRICAL ENGINEERING • JULY/AUGUST 2022 19


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