With up to 120 minutes fire resistance
	Integrity & Insulation
	Tested to BS476: Part 20 & AS1530: Part 4 requirement

Electrical Cable Enclosure - External fire for circuit integrity

Internal Cross Section Table 1:
Equal or smaller than 110mm x 100mm

Internal Cross Section Table 2:
Equal or greater than 110mm x 100mm /
Equal or smaller than 520mm x 250mm

The board thicknesses given in the tables 1 & 2 will ensure that when the duct is exposed to a fully developed cellulosic external fire (BS476 curve), the cable jacket temperature rise will not exceed 120°C and the cables will remain functional. If the cables are not required to maintain circuit integrity it may be possible to reduce the board thickness after consultation with the Promat Technical Department. Promat can also advise on specifications for larger duct sizes. The board thickness is dependent on the internal dimensions of the duct and whether the duct has a loose fit lid or a fixed lid.

Wall penetrations

System Specification

Electrical cable enclosures are to be constructed using PROMATECT®-H, PROMATECT®-L or PROMATECT®-L500 matrix engineered mineral boards all in accordance with the Architectural Specification in the manufacturer’s handbook. Relevant constructions are to be selected according to the required FRL of 30/60/90/120 minutes of the selected elements. All printed installation details are to be followed to ensure approval to BS476: Part 20 or AS1530: Part 4. All work to be certified by installer in an approved manner.

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