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Luminaires Draught-proof enclosure- IEC60598 Annex D

Luminaires Draught-proof enclosure- IEC60598 Annex D

Draught-proof enclosure JY-FFZ2000

  1. Introduction

Draught-proof enclosure is designed according to IEC60598.1 annex D,

JY-FFZ2000 is applied to thermal test of luminaire under the conditions of normal operation and abnormal operation. The draught-proof enclosure is rectangular, with a double skin on top and on at least three side, and with a solid base. The double skins are of perforated metal, spaced approximately 150mm apart, with regular perforations of 1mm to 2mm diameter, occupying about 40% of the whole area of each skin. At the top of enclosure shall mounted a ceiling plate or a dismountable hanging bracket with a hook to fix the luminaire at the ceiling. At the bottom of side of enclosure shall install inlet hole for the purpose of wire connection. For the sake of install luminaire, the enclosure equip with a sample holder, as per the standard, 2-layer black solid-board is applied to fix the luminaire under test.


  1. Specification

1) outer shell structure: double layer rectangular structure, made by 1mm cold steel plate (black matt paint)

2) Outer size: 2100*2100*2150mm ( or Customizable)

3) Inner size: 1800*1800*2000mm (or Customizable)

4) Spaced interval: 150mm

5) Door structure: single, double layer (outward open), 1800mm*800mm

6) Aperture: ф1mm -ф2mm

7) Ventilation rate: 40%±0.5%

8) Frame type: Sheet material, impact molding, not affect ventilation rate

9) Surface coating: black matt paint

10) plywood with matt paint, size: 2500mm*2500mm*15mm (L*W*Thickness)

11) Ceiling mounting board:  600mm*600mm (L*W), coating with black matt paint

12) Installation plate: 0.6~1.0m (height, adjustable), composite board with black matt paint, enable vertical or horizontal install luminaire, wooden table: 600*500mm, adopts aluminium lifting.

13) Thermal slices: Φ15X1,latten


Annex D

The following recommendations refer to the construction and use of a suitable draught-proof

enclosure for luminaires, as required for the tests of normal and abnormal operation.

Alternative constructions for draught-proof enclosures are suitable if it is established that

similar results are obtained.


The draught-proof enclosure is rectangular, with a double skin on top and on at least three

sides, and with a solid base. The double skins are of perforated metal, spaced approximately

150 mm apart, with regular perforations of 1 mm to 2 mm diameter, occupying about 40 % of

the whole area of each skin.


The internal surfaces are painted with a matt paint. The three principal internal dimensions are

each at least 900 mm. There shall be a clearance of at least 200 mm between the internal

surfaces and any part of the largest luminaire for which the enclosure is designed.


If it is required to test two or more luminaires in a large enclosure, care should be taken that

radiation from one luminaire cannot affect any other.


There is a clearance of at least 300 mm above the top of the enclosure and around the

perforated sides. The enclosure is at a location protected as far as possible from draughts and

sudden changes in air temperature; it is also protected from sources of radiant heat.


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-fibre board. A non-combustible insulating material is used if the luminaire is

not suitable for mounting on a combustible surface. The board is 15 mm to 20 mm thick, and

extends not less than 100 mm (but preferably not more than 200 mm) beyond the normal

projection of the smoothed outline of the luminaire. There is a clearance of at least 100 mm

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 general use particle board, in which a suitable

opening has been made for the luminaire. The general use particle 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 general use particle board

tightly sealed to the sides.


  1. a) Luminaires for recessing into ceilings with thermal insulating material covering the


Sealed box with thermal insulating material is 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.

  1. b) Luminaires for recessing into ceilings but not suitable for covering with thermal insulating


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.


If there are projecting spacers on the top or sides of the luminaire, then these spacers shall be

placed in direct contact with the inside surfaces of the test box or insulating material.

The suspended ceiling and the interior of the box are painted black with a matt non-metallic

paint, and there shall be a gap of not less than 100 mm between this assembly and the inside

walls, ceiling and floor of the test enclosure.

When a luminaire is intended to be recessed into a wall, the test is made using a test recess

similar to that described above, but with the board placed vertically.

For luminaires classified for mounting in direct contact with a normally flammable surface, no

part of the test recess shall exceed 90 °C (as given in Table 12.1) during the normal operation

thermal test and 130 °C (as given in Table 12.3) during the abnormal operation thermal test.


For luminaires classified as not suitable for direct mounting on normally flammable surfaces,

no temperatures are measured for the mounting surface or test recess.

A track-mounted luminaire is connected to a track system appropriate to the luminaire. The

track is mounted as in normal use, according to the manufacturer’s installation instructions.

The luminaire is connected to the track in the most onerous thermal position of normal use

permitted by the mounting instructions or marking. The luminaire is operated under the

conditions specified in 12.4.1 and 12.5.1.

All spacings shall be measured from the extremes of the positions of movement where

luminaires are settable and adjustable in overall dimension or position in either axis when fully

installed and during normal operation (see Figure D.2).

Figure D.2 illustrates the correct test box size for a luminaire that is adjustable in both axes

and thus needs space within a ceiling for the setting or the adjustment.

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