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NZECP-54 Classifications Guide for Recessed Luminaires
New Zealand
Electrical Code of Practice for the Installation of Recessed
Luminaires and Auxiliary Equipment 2001
(To view the complete document visit
www.ess.govt.nz)
NZECP 54
SECTION 3
RECESSED LUMINAIRES AND AUXILIARY EQUIPMENT
- CLASSES AND APPLICATION
3.1 GENERAL
Recessed luminaires are categorised into five classes:
(a) open: (O)
(b) restricted; (R)
(c) closed; (C)
(d) fire resistance rated (FR); and
(e) acoustic rated (AR).
3.2 RECESSED LUMINAIRE CLASSES
| (O) |
Open - An open
recessed luminaire is a luminaire in which the area that is
open between the ‘Occupied Space’ and the ‘Concealed Space’
is greater than 15% of the area of the hole cut in the
ceiling into which the luminaire is fitted. |
| (R) |
Restricted - A
restricted recessed luminaire is a luminaire in which the
area that is open between the ‘Occupied space’ and the
‘Concealed Space’ is greater than 5% but not more than 15%
of the area of the hole cut in the ceiling into which the
luminaire is fitted. |
| (C) |
Closed - A closed
recessed luminaire is a luminaire in which the area that is
open between the ‘Occupied Space’ and the ‘Concealed Space’
is not more than 5% of the area of the hole cut in the
ceiling into which the luminaire is fitted. |
| (FR) |
Fire resistance rated
- A fire resistance rated recessed luminaire is a luminaire
that is sealed between the ‘Occupied Space’ and the
Concealed Space’ and does not compromise the fire resistance
rating of the space. |
| (AR)
|
Acoustic rated - An
acoustic rated recessed luminaire is a luminaire that is
sealed between the ‘Occupied Space’ and the ‘Concealed
Space’ does not compromise the acoustic rating of the space. |
3.3 THERMAL INSULATION MATERIAL CLEARANCE
Recessed luminaires are also categorised into three thermal
insulation clearance classes: |
| (A) |
Abutted - The aperture
made in the insulation material is of the same size as the
hole made in the ceiling surface for recessing the luminaire
into. |
| (S) |
Standard 100 mm - The
aperture made in the insulation material is approximately
100mm larger on each side of the fitting, than the size of
the hole made in the ceiling surface for recessing the
luminaire into. |
| (*) |
Specified - The
aperture made in the insulation material is that which is
specified in the manufacturer’s installation instructions. |
3.4 APPLICATION |
| 3.4.1 |
The recessed
luminaires moisture transfer classes are cross-referenced
with their permissible distances from thermal insulation.
Table 1 gives subcategories of recessed luminaires that can
then be applied to various areas and ceiling construction
types are shown in Table 2. (Refer manufacturer’s
installation instructions for specific recessed luminaire
details). |
| 3.4.2 |
Where no
manufacturer’s installation instructions are available for
specific recessed luminaires a minimum distance of 500 mm
shall apply to thermal insulation clearances. |
TABLE 1
RECESSED LUMINAIRE CLEARANCES FROM THERMAL INSULATION
|
Thermal Insulation Clearance Distance
|
Recessed Luminaire
Moisture Transfer Class |
|
Open Restricted
Closed |
Abutted to recessed luminaire
100 mm gap (standard)
Specified by manufacturer |
OA
RA
CA
OS
RS
CS
O*
R*
C* |
| Fire resistance rated |
Refer Manufacturer’s
Installation Instructions |
| Acoustic rated |
Refer Manufacturer’s
Installation Instructions |
* Denotes that the second classification is
specified in the manufacturer’s installation instructions.
| 3.5
AUXILIARY EQUIPMENT |
| 3.5.1 |
Auxiliary equipment
used with recessed luminaires shall be installed to: |
|
(a) |
Be electrically safe; |
|
(b) |
Be adequately
supported, ventilated and not covered by thermal insulation; |
|
(c) |
Prevent the risk of
overheating and fire; |
|
(d) |
Be positioned so as
not to be degraded or damaged by heat emitted by the
luminaires or their lamps; |
|
(e) |
Ensure that
transformers are not installed directly above lampholders; |
|
(f) |
Ensure that
transformers are not installed within a fire barrier unless
they are fire rated; |
|
(g) |
Not be degraded by the
effects of moisture or vapour; |
|
(h) |
Be enclosed so that
low voltage parts cannot be accessed without the use of a
tool; |
|
(i) |
Ensure that cables
supplying power to the luminaire or auxiliary equipment are
kept away from heat sources such as the rear of lamps or too
close to auxiliary equipment. |
| 3.5.2 |
Auxiliary equipment,
used with recessed luminaires shall have secondary circuits
wired in compliance with AS/NZS 3000 or NZS 3000. |
| 3.5.3 |
Auxiliary equipment
such as heat dispersal covers (heatcans) shall be classified
as per Table 1 and shall have manufacturer’s installation
instructions. |
TABLE 2
CROSS REFERENCE OF RECESSED LUMINAIRES CLASSES WITH CEILING TYPES
| 3.6
SUPPORTS |
|
|
In
suspended T-bar tiled ceilings, any recessed luminaires or
auxiliary equipment (ballasts etc) over 1 kg in weight,
shall be structurally supported and fixed in position, in
such a way as to not compromise any building elements. No
more than 1kg total mass shall be placed on a single tile
unless the tile is rated to carry more than 1 kg. The total
mass of all recessed luminaires and auxiliary equipment,
supported by a ceiling system, shall not cause the load
bearing capacity of the ceiling to be exceeded. |
|
|
|
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3.7 MOIST AREAS |
|
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Where
recessed luminaires are installed in moist areas they shall
be of a type that prevents the transfer of moist air, steam
or water vapour into concealed spaces by: |
|
(a) |
Being
physically enclosed or sealed and rated suitable for use in
moist areas; or |
|
(b) |
Of the
closed type; or |
|
(c) |
Of the
restricted type where the space is provided with adequate
mechanical ventilation, in accordance with the New Zealand
Building Code G4. |
 |
Clearances
Guide
|
SCB |
Side Clearance to
Building Element |
| |
Distance from side of
fitting to adjascent combustible building element.
The side of fitting is deemed to be aligned with the
cut out hole. |
|
HCB |
Height Clearance to
Building Element |
| |
Distance from the top of
light fitting to combustible building element above. |
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