Electrical enclosure FAQs, answered by experts

Coastal and marine installations call for corrosion-resistant, UV-stable materials such as polycarbonate or glass-reinforced polyester (GRP), rather than metal enclosures or fixings that are prone to salt-air corrosion. A NEMA 4X rating, roughly equivalent to IP66, indicates an enclosure has passed 200 hours of salt-spray testing for corrosion resistance.

Standard Spelsberg enclosures are supplied in a single colour, as most specifications prioritise size, strength and ingress protection over appearance. Custom colour options, including black, can be produced to order for installations where an enclosure will be visible and aesthetics matter.

Using a cable gland through a knockout does not affect an enclosure's IP rating, provided the gland's own rating matches or exceeds it. Spelsberg's cable gland range is rated IP68, and gland/enclosure spec sheets are available to confirm compatibility for a specific installation.

Spelsberg's IBT series is the only enclosure range specifically designed for precast concrete construction, sealing against concrete ingress during pouring while remaining stable and easy to install. The range includes universal, junction and installation boxes, wall and ceiling transfers, and accessories such as sealing plugs, punch tools and support bars.

Spelsberg can supply a certificate of conformity confirming enclosures meet relevant VDE, EN, CSA and UL requirements, tested at its in-house, UL- and EN-certified laboratory in Germany. This applies equally to bespoke enclosures, with certificates covering technical drawings, materials, IP ratings and fire resistance as specified by the customer.

EN45545 has been mandatory for fire protection on European rail vehicles for several years, and Spelsberg has worked with rail industry customers on compliant solutions since before the standard took effect. Its WKE junction box range is tested to EN60670, with standard enclosures continually developed to meet EN45545 requirements alongside bespoke, customer-specific fire-safety solutions.