Cases & enclosures
cable junction and connection box. However, an enclosure designed specifically for fire protection and wall mounting also needs to form a barrier against more than flame and heat. These special junction boxes need to with- stand water ingress from sprinkler systems and high-pressure hoses, so an IP66 rating is also key. An IK08 impact protection rating should also apply to defend electrical connections from force, which is another advantage of designing with high- strength polycarbonate.
EASY ACCESS FOR INSTALLATION AND MAINTENANCE
While appropriately designed, externally fitted enclosures can provide sufficient fire defence, the significant advantage of easy access also enables frequent inspection to ensure long term integrity. For example, the Spelsberg WKE fire protection
Instrumentation Monthly November 2024
box can be rapidly accessed by maintenance and safety teams via four screws positioned in the enclosure cover. This lid is held in place by a cover retainer lanyard to prevent loss during inspec- tion while unauthorised access can be prevented thanks to a safety seal.
To speed up a project for installers, wall- mounted, fire-resistant enclosures really come into their own. Just like a standard junction box, these casings can be installed wherever required or convenient for the environment, without needing to make precise design plans in advance. In the case of the Spelsberg WKE, the enclosure can be quickly mounted in situ by two external lugs that can be rotated 90 degrees.
Inside the box, the terminal block can also be adjusted through three positions, including 0, 45 and 90 degrees, and cables can be quickly and securely inserted with additional metric cable glands.
ENCLOSURE SPECIALISATION Depending on the design of the building or installa- tion, enclosure specification for fire protection can often gain from specialist support. This could range from advising on the right type of enclosure to meet the electrical connection needs of the installation, whether that is a high-rise block of flats or an under- ground railway, as well as ensuring that the required safety compliance is met for the environment. Achieving fire safety for electrical connections is essential for building managers, maintenance teams, and electrical installers. At the same time, project time pressures for rapid installation always remain. However, wall-mounted enclo- sures that meet E30-E90 fire and heat resistance, and also enable rapid installation and maintenance access, are an ideal solution to meet these challenges.
Spelsberg
www.spelsberg.co.uk 21
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