INTUMEX “L” Power/Switch boxes which contain the intumescent material, Intumex “L” which is activated by heat, preventing the spread of fire and smoke. Application For the fire rating of conventional power/switch boxes - when activated by heat,the Intumex “L” expands preventing thespread of fire and smoke.   Fire Test Data The Pyropanel® system of fire rating electrical power switch boxes is fully tested and approved in accordance to AS 1530, Part 4, 1997 and can achieve a fire resistant rating of up to two (2) hours depending on the construction element it is installed in. Installation Cut four (4) strips of Intumex “L” to size and place in the base of a standard size metal power/switch box. Download Catalogue Page (Tech Sheet) Technical Service For complete technical and further information contact Pyropanel® on (03) 9735 5688 or your nearest Pyropanel® Distributor.