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Ensuring our products comply to industry standards is of the utmost importance to us here at Penhale Quantock Ltd. We have extracted elements from the Building Regulations Part B, and some BS Standards, which are applicable to our product range. We hope this helps provide a good overview as to how the performance of our enclosure range ties in with industry standards.
BUILDING REGULATIONS PART B
The Building Regulations PART B is the document which addresses the Fire Safety of a building. This document sets out regulations for the use of thermoplastics in the manufacture of 'lighting diffusers' which form part of a ceiling. The regulations use the classifications 'TP(a)' and 'TP(b)'.
WHAT IS TP(a) AND TP(b)?
Thermoplastics come in a large range of variety of grades, all of which boast different performances and possess different characteristics, dependent on application requirements. One of the key considerations, especially within our industry, is the materials ability to prevent and reduce the risk of fire. There are currently a large range of tests around the world with different parameters which produce different results. Part B of the Building Regulations
identifies TP(a) and TP(b) as performance classifications when referring to the materials used for lighting diffusers. These classifications are determined by testing the burning rate of a thermoplastics and are outlined in the below test procedure. The test is referenced throughout the building regulations.
BS 2782-0:2004 - Methods of testing plastics - Annex B (Method 508A: Rate of burning, laboratory method (obsolescent))
TP(a) rigid is achieved for a specimen of which (at the thickness of the product as put on the market), when tested as above, performs so that the test flame extinguishes before the first mark and the duration of flaming or afterglow does not exceed 5 seconds following removal of the burner (Standard mm/minute > 5mm).
TP(b) is achieved for other products which, when a specimen of the material between 1.5 and 3mm thick is tested as above, has a rate of burning which does not exceed 50mm/minute.
B2. WALL AND CEILING LININGS | Lighting Diffusers (Extract from Building regulations Part B)
6.13 The following provisions apply to lighting diffusers which form part of a ceilings
and are not concerned with diffusers of light fittings which attached to the soffit or,
or suspended beneath, a ceiling (see Diagram 26).
Lighting diffusers are translucent or open structured elements that allow light to
pass through. They may be part of the luminaire or used below rooflights or other
sources of light.
6.15 Subject to the above paragraphs, ceilings to rooms and circulation spaces
(but not protected stairways) may incorporate thermoplastic lighting diffusers if the
following provisions are observed:
a. Wall and ceiling surfaces exposed within the space above the suspended ceiling
(other than the upper surfaces of the thermoplastics panels) should comply with the
general provisions of paragraph 6.1 and Table 10, according to the type of space
below the suspended ceiling.
b. If the diffusers are of classification TP(a) (rigid), their are no restrictions on their extent.
c. If the diffusers are of classification TP(b), they should be limited in extent as
indicated in Table 11 and Diagram 27.
BS EN 60598 | LUMINAIRES. GENERAL REQUIREMENTS AND TESTS
SECTION 2: CLASSIFICATION OF LUMINAIRES
This section describes the classification of luminaires.
Luminaires are classified according to type of protection against electric shock, the degree of protection against ingress of dust, solid objects and moisture, the material of the supporting surface and the circumstance of use.
2.2 Classification according to type of protection against electric shock
Luminaires shall be classified according to the type of protection against electric shock provided, as class I, class II or class III (see definitions in Section 1).
2.3 Classification according to degree of protection against ingress of dust, solid objects and moisture.
Luminaires shall be classified in accordance with the "IP" system of classification described in IEC 60529.
PQ: We have IP certification available across our range for your technical files which are available upon request.
2.4 Classification according to material of supporting surface for which the luminaire is designed.
2.5 Classification according to the circumstance of use.
Luminaires shall be classified according to whether they are intended for normal use or rough service.
SECTION 3: Marking
PQ: Marking on the luminaires is an important element of the standard to ensure safe installation and maintenance. We have an example below of the information we use for our Eclipse Cast label. Again, for full detailed descriptions please read the BS EN 60598 standard.
'CE' mark is a declaration that the luminaire complies with the
Electrical Equipment (Safety) Regulations 1994
Maker's model number or type reference
Colour Temp (optional)
Mark of origin
3.4 Test of Marking
The durability of the marking is checked by trying to remove it by rubbing lighting for 15s with a piece of cloth soaked with water, and, after drying, for a further
15 s with a piece of cloth soaked with petroleum spirit and by inspection after tests detailed in Section 12 have been completed.
After the test, the marking shall be legible, marking on labels shall not be easily removable and they shall show no curling.
PQ: The luminaire markings are only as good as the label they are on. Always check to ensure you are using complaint labels to avoid any risk of the marking wearing off of the labels coming off the luminaires. Please also ensure that the labels are compliant with the variety of surface finishes of our enclosure range, powder coated cast, polycarbonate, coated steel etc.
SECTION 4: Construction
4.15 Flammable materials
4.15.1 Covers, shades and similar parts not having an insulation function and which do not withstand the 650⁰ glow-wire test of 13.3.2 shall be adequately spaced from any heated part of the luminaire which could raise the material to its ignition temperature. These parts made of flammable material shall have suitable fastenings or supporting devices to maintain this spacing.
The spacing from heated parts mentioned above shall be at least 30mmm, unless the material is protected by a screen spaced at least 3mm from the heated parts. This screen shall comply with the needle flame test of 13.3.1, shall have no holes, and shall have a height and a length at least equal to the corresponding dimensions of the heated parts. A screen in not required in cases where the luminaire provides an effective barrier to burning drops.
L.7 Components in different kinds of luminaires
C. Fire resistance (IEC 60664-1)
- glow wire test 650 ⁰
- glow wire test 850 ⁰
PQ: Glow wire for us an essential element of the BS EN 60598 standard as it ensures plastic components which make up luminaires have sufficient resistance to ignition and flame. For standard commercial luminaires the requirement is currently 650⁰ glow wire and for emergency is 850 ⁰. Here at PQ our materials are 850 ⁰ and certification is available upon request for your technical files.
SECTION 9: Resistance to dust, solid objects and moisture
9.2 Tests for ingress of dust, solid objects and moisture
The enclosure of the luminaire shall provide the degree of protection against ingress of dust, solid objects and moisture in accordance with the classification of the luminaire and the IP number marked on the luminaire.
PQ: Please see below our available IP65 enclosures. IP certification is available upon request for your technical files.
ANNEX L: Guide to good practice in luminaire design
L.2 Plastics in luminaires
In luminaire construction, plastic components have become important and proven functional elements. This applies to internal parts and wiring, and to components such as translucent covers, shields and parts for structural support.
The applications relative to the "normal" usage of luminaires determine the normal running life (ageing) of these plastic parts.
Excessive hard usage and damaging influences diminish the resistance to ageing. See Table L.1.
(Table L.1 taken from BS EN 60598)
With a softening temperature of around 140⁰C, our high quality polycarbonates are able to withstand any potential temperature issues within the luminaire.
All our polycarbonates have been reinforced with UV stabilizing properties to combat the UV radiation from the sun. This significantly increases the performance of our products and means our polycarbonate enclosures are suitable for outdoor applications.
Special attention should be given to:
- continuous service temperature;
- UV and visible radiation;
- static and dynamic mechanical impact;
- oxidizing atmospheres
Some combinations of these influences have particular importance and may make the material unsuitable for the intended application. For example, the combination of UV radiation and heat may produce a green substance from PVC cable insulation, indicating the degradation of the insulation. The properties published with respect to particular materials of given generic names can differ depending on the fillers or inhibitors used, the manufacturing procedure and the design.
It is essential when specifying a product to check if the luminaire is at risk of being exposed to any unusual substances which may damage the fitting. Whether it be atmospheric or being exposed to certain environments.
When choosing a cleaner it is important to check with the manufacturer if the solution will damage polycarbonate.
Units 13-15 Roughmoor Enterprise Centre,
Tel: 01984 632090
Fax: 01984 632129
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