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INSTALLATION OF DOWNLIGHTS - NZCEP54 COMPLIANCE

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The New Zealand Code of Practice for the installation of recessed luminaires is aimed at ensuring the durability of building is not compromised by the installation of downlights. A new classification system NZCEP54:2001, has been introduced. It groups downlights into general classes that defines them for use in certain areas.

The reason for the move is because downlights are seen to compromise certain aspects of the building code, namely:
1) H1: Energy Efficiency – because downlights require that insulation is moved out of the way
2) B1: Structure – because “building elements” can be damaged when downlights are too close
3) E3: Internal Moisture – because moisture can be transmitted into the roof space
4) B2: Durability – because moisture can get into concealed spaces resulting in mould

The classification of the fitting will be in the form of two letters, one representing the Moisture Transfer category, and the other the Thermal Insulation category. The distance from building elements is specified in the installation instruction.

Moisture transfer category


Defines fittings for use in certain areas, based on the extent to which they allow moisture into the roof space
Categories are: Restricted (R), Closed (C), Open (O), Fire resisted, Acoustic.
Generally, a class C fitting is required where moisture can get into concealed spaces (most common situation), whereas a class R is allowed where there is adequate mechanical ventilation

 

Thermal Insulation category

Defines the clearance from thermal insulation once installed
Categories are: Abutted (A), Standard (S)
The building code requires all recessed fittings to be installed 100mm away from insulation. Where fittings are rated A, the insulation can abut the fitting. Any associated equipment (eg: transformers) must not be smothered by the insulation.

Building Elements


Defines how close to timber fitting can be installed
Category: N/A. Specified by manufacturer in instructions accompanying order
The building code requires all recessed fittings to be installed with 200mm side and height clearance from building and structural elements. Where fittings are rated A, this distance can be reduced to that specified in the instruction sheet. All associated equipment such as transformers and ballasts must be adequately supported, and must not be smothered by insulation.

 

Responsibility

Most suppliers will provide the necessary compliance specifications for their fittings in their catalogue material. Once the fittings are on site, the electrician will be able to refer to more detailed information in the instructions to assist in the installation. It is the manufacturer’s responsibility to provide full instructions and specifications, and it is the electrician’s responsibility to interpret and apply the code.