Fire Rated & Resistant Electrical Enclosures & Junction Boxes
Fire resistant enclosures and junction boxes are used to maintain electrical and electronic circuit integrity to emergency lighting, power and control cables in both “safe” non-hazardous and also hazardous area locations.
T&D can provide pre-assembled (Abtech BPGF) or customised (BPG) enclosures conformant with BS standards for connecting and terminating fire performance cables typically supplying fire detection, fire communication, fire fighting and life safety circuits.
Abtech BPGF fire resistant enclosures provide fire survival duration according to PH120 (BS EN 50200 & BS8434-2) and are supplied pre-assembled with either 8 or 12 way terminal blocks.
T&D supply customised fire proof junction boxes using the Abtech BPG range of enclosures fitted with ceramic terminals blocks to withstand extreme heat and fire with versatile cable termination options – enclosures can be machined, drilled or tapped with threaded entries to accept cable glands.
The Abtech range of fire rated electrical junction boxes are specified for use in building services and hazardous areas, where ATEX certified enclosures are required for potentially explosive atmospheres – see Zone 1 & Zone 2 Hazardous Area Enclosures.
GRP and stainless steel enclosures have been independently tested in accordance with BS EN 50200, BS 8434-2 (up to 950 degrees C) and IEC311 (up to 750 degrees C).
|Enclosure Type||IEC 331|
for 3 hours
for 3 hours
for 3 hours
for 3 hours
|Abtech SX Range||Pass||Pass||Pass||Pass|
|Abtech BPG Range||Pass||Pass||Not Tested||Not Tested|
💡 If you have any specification concerns selecting fire resistant enclosures for life safety and fire-fighting applications, contact T&D.
Fire resistant enclosures & junction boxes
BS6387 Fire Test
BS6387 fire test standard determines the performance of a section of cable under specified conditions to ensure the cable maintains its integrity under fire conditions – the 3 variations of the BS6387 test are ‘C’, ‘W’ and ‘Z’. Each category within the test highlights the specific capabilities of the cable under set conditions below.
Abtech BPG fire resistant junction boxes consist of 16 sizes of enclosures manufactured in glass reinforced polyester GRP) or a carbon loaded anti-static GRP (BPGC) – under fire test conditions the enclosure structure retains stability even if the resin is depleted.
BPG enclosures fitted with ceramic terminals meet the requirements of IEC 331 (750°C for 3 hours) and also BS6387/1983 (950°C for 3 hours – flame only).
Enclosures are certified and approved for use in hazardous areas according to ATEX and IECEx Ex ‘e’ (Zone 1 & 2), EEx ‘nA’ (Zone 2) and CSA, UL & FM (Class 1, Div 2).
1. Fire alone: Category C – flame at 950°C for 3 hours, cables energised
2. Fire with Water: Category W – flame at 650°C for 15 minutes then flame and water spray for 15 minutes
3. Fire with Mechanical shock: Category Z – flame at 950°C with mechanical shock applied at 15 second intervals for 15 minutes
Note: All fire rated enclosures must be fitted with ceramic terminals.
Each video below give a short demonstration of each test and are extracted from BS 6387 test videos via Cavicel S.p.A
|BS6387 ‘C’ – Fire Alone|
|BS6387 ‘W’ – Fire And Water|
|BS6387 ‘Z’ – Fire + Mechanical Shock|
|Abtech Part Number||Width (mm)||Length (mm)||Depth (mm)||Hazardous Area Ex Certified|
Abtech BPGF are fire resistant tested to PH120 (120 minute exposure) insulation integrity in accordance with BS EN 50200 and BS 8434-2 (>930°C) with exposure to fire with water spray and mechanical shock.
Additionally, the enclosures are fire resistant according to insulation integrity (180 minute exposure) in accordance with IEC (>750°C) with exposure to fire with water spray and mechanical shock. The enclosures demonstrated full functionality and performance before, during and after the fire test.
For further information and copy Fire Test Reports contact T&D.
Extreme Fire Resistance Testing for high voltage enclosures
Abtech are market-leader manufacturers of high voltage enclosures for power distribution at 3.3kV, 11kV and 33kV.
Abtech high voltage enclosures (HVJB) coated with K‐Mass™ fireproofing and rated up to 19kV are fire tested to 1100°C for 1 hour in accordance with HC fire curve NEK 606. Under conditions as specified in ASTM E1725 (Section 4) & ASTM E1529 (Section 5).
Pictured – the electrical enclosures are shown fitted with ceramic pillars, side plates and phase separators.
Clad with K‐ Mass™ 19kV DC is then applied for 1 minute without breakdown prior to testing – certified high voltage, hazardous area and fire resistant enclosures.
Contact T&D for price, delivery and specification advice.
1100°C for 1 hour
The required furnace temperature reached after 7 minutes and 44 seconds prior to the fire test commencing – a constant 4kVDC voltage was maintained for the duration of the test and leakage was closely monitored throughout the test.
Maximum recorded temperature within the enclosure was 349°C – after after a cool down period a 19kV DC was re‐applied and the enclosure passed.
Conclusions confirmed there was no breakdown.
➡ For complete specifications on the full range of Fire Resistant Enclosures please see the below product section.