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ACEX Fire-rated Stainless Steel Enclosures



  • Fully tested to BS5839-1:2013 Sec 26.2e at 970ºC for 2 hours and BS6387 CWZ at 950ºC for 3 hours
  • Fire rated enclosures are available as: CEX (heavy duty) stainless steel, ACEX stainless steel, CEP Polyester and CEA aluminium.
  • ATEX Ex e certification is also for CEX,   ACEX , CEA and CEP enclosures as an option.

Ingress protection levels

IP66 and 67 (EN 60529/IEC 60529)

Ambient temperature

-55ºC to +65°C with appropriate gasket


ACEX enclosures are manufactured from 316L stainless steel and available in 27 popular sizes ranging from 110x110x65mm to 1177x777x300mm with an orbital, bead-blast or electro-polished finish. ACEX are manufactured to the CEX specification technically but are equipped with standard hinges, hank bushes and a return flange, which allows water to drain away and provide a knife edge high grade seal.

CE-TEK’s ACEX (stainless steel) enclosures have been successfully tested to all the latest fire standards for use in buildings and infrastructure projects.

When using fire rated cables on a project, the correct specification of junction boxes can often get overlooked. When fire strikes, it is not selective in the location junction boxes and to maintain system integrity it is imperative that junction boxes are specified to the same rating as the cable being used.

The consequences of not selecting the correct type of enclosure can be huge, both financially and in terms of installation slippages. An example of this is where architects had specified fire-rated enclosures for a luxury hotel group, but electrical contractors had installed less expensive industrial enclosures that were not fire-rated, which had to be replaced throughout the hotel.

CE-TEK manufacture four series of fire rated junction boxes (CEX, ACEX, CEP and CEA), which are tested for fire to various standards including: BS5839-1: 2013 Sec 26.2e; BS EN 50200: 2006;  BS 8434-2: 2003; IEC60331-2: 2009, BS8434-2: 2003 + A2: 2009; IEC331 and BS6387-11: 1994.

Typical applications include road, motorway, rail and underground tunnels, offices, hotels and public buildings, and major infrastructure projects.


Technical data (Extract) (For detailed information please click here)

Protection class

IP 66 and 67 (EN 60529/IEC 60529) 


see data sheet


316L stainless steel


see data sheet


see data sheet


ACEX Fire-rated Data Sheet – Stainless Steel Enclosures

Fire Rated Junction Box Installation Guide

Declaration of Conformity

Customer requirements – Terminal/Junction Boxes

Operating Instructions – Empty enclosure

Operating Instructions – Populated enclosure