How to Fix the Luminaire on the Draught-Proof Enclosure?

Issuing time:2020-12-28 15:59Author:PEGO GROUPSource:PEGO GROUP

A luminaire under test is positioned as far away as possible from the six internal surfaces of the enclosure. The luminaire is mounted (subject to the requirements of 12.4.1 and 12.5.1) as under service conditions.


A luminaire for direct fixing to a ceiling or wall should be fixed to a mounting surface comprising a wood or wood-fiber board. A non-combustible insulating material is used if the luminaire not suitable for mounting on a combustible surface. The board is 15mm to 20mm thick, and extends no less than 100mm (but preferably not more than 200mm) beyond the normal projection of the smoothed outline of the luminaire. There is a clearance of at least 100mm between the board and the internal surfaces of the enclosure. The board is painted black with a matt non-metallic paint.

A luminaire for corner-fixing is fixed in a corner comprising two boards, each complying with the preceding requirements.

A third-board is required if the luminaire is to be fixed in a vertical corner immediately below a simulated ceiling.



Luminaires shall not cause the recess to attain temperatures likely to cause a hazard or fire risk and compliance is checked by the following test.

Recessed luminaires are mounted in a test recess, consisting of a suspended ceiling, on top of which is a rectangular box with vertical sides and horizontal top.

The suspended ceiling is made of a 12 mm thick porous wood-fibre board, in which a suitable opening has been made for the luminaire. The wood-fibre board shall extend at least 100 mm outside the projection of the luminaire on this board. The vertical sides of the box are made of 19 mm thick laminated wood and the top of 12 mm thick porous wood-fibre board tightly sealed to the sides.

a) Luminaires for recessing into ceilings with thermal insulating material covering the luminaire sealed box with thermal insulating material tightly fitted to the outside of the box. The thermal insulation shall be equivalent to two 10 cm thick layers of mineral wool with a coefficient of thermal resistivity of 0,04 W/(m.K). Thinner layers can be used when having a higher thermal resistivity. The thermal resistance of the test box shall in any case be at least 5 m2 K/W.

b) Luminaires for recessing into ceilings but not suitable for covering with thermal insulating material. For recessed luminaires of this kind, the test recess shall be of the same materials as described above. The sides and top of the box shall be spaced from the luminaire in accordance with the manufacturer’s instructions supplied with the luminaire. If no spacing is specified, the sealed box shall touch the luminaire all around.

If a luminaire is provided with separate parts intended for recessed mounting, (for example, with separate lamp enclosure and control gear enclosure), the test recess shall be constructed as a single box observing the manufacturers recommendations for minimum spacing between parts and the inside of the recess (see Figure D.1). Where spacing between parts is not specified (item a of Figure D.1), separate test recesses shall be used for each part.


The draught-proof enclosure designed by Pego fully takes into account the installation problems of various luminiare, and is equipped with all kinds of accessories to assist in the installation of various luminaire.


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