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12.7 Thermal test in regard to fault conditions in lamp controlgear or electronic
, i4 d0 O9 B4 M9 L) L2 `devices in plastic luminaires+ r/ @7 X, P5 k2 l. ]; ~
The test applies only to luminaires with a thermoplastic housing not fitted with an extra2 m* ~* g7 l: d5 f7 j" n- z2 w6 w
mechanical temperature-independent device as per 4.15.2.+ B4 V/ m, P' l5 Y& U2 _# x# L% `
% q& i: u. o b8 @- l12.7.1 Test for luminaires without temperature sensing controls
7 N+ y! i" O3 q" r2 z# [7 \The luminaire shall be tested under the conditions specified in items a), c), e), f), h) and l) of
& a4 _+ j m8 @: Q12.4.1. In addition, the following also applies.
" h9 @, f! @% `* W& n' d; n* j20 % of the lamp circuits in the luminaire, and not less than one lamp circuit, shall be
( o3 {2 p4 U' l9 A' \ b- csubjected to abnormal conditions (see item a) of 12.5.1).) [5 I p. Z0 w0 o
The circuits which have the most thermal influence on the fixation point and exposed parts+ f" q* J1 f' D% \, }
shall be chosen and other lamp circuits shall be operated at rated voltage under normal
" l w' L y6 @0 \% u& Yconditions.
1 f7 r9 k3 H% z8 vThe circuits subjected to abnormal conditions shall be operated at 1,1 times (the rated voltage
' g2 h4 Y) k) lor the maximum of the rated voltage range). When conditions are stable, the highest winding
2 g: V9 v# N2 {8 \2 N4 ^temperature and highest temperature of fixing points and most thermally influenced exposed9 L* f! K- |) H1 L+ w# R
parts shall be measured. It is not necessary to measure the temperature of small wound
2 g1 Q4 x, L, ddevices that are incorporated within electronic circuits., P+ k. p5 A8 y6 p8 S' A
Compliance! X$ t! j/ j9 |
The values of the ambient temperature and the temperature measured at 1,1 times (the rated
& A; D: X+ q/ | ovoltage or the maximum of the voltage range) are used for the linear regression formula in
3 b% d# _! Y2 k. qcalculating the temperature of fixing points and other exposed parts in relation to a
8 T4 l8 Q' t- c4 P& L0 Nballast/transformer winding temperature of 350 °C. The calculated value shall not exceed the
- _% Z6 a$ q1 ?: Vtemperature of the deflection under load of the material in accordance with method A as; s+ g5 s" J \/ x8 j
defined in ISO 75 (1987), Plastics and ebonite – Determination of temperature of deflection- C& B$ A, C( T
under load.1 n% J5 `' ~+ n3 M6 y9 N
12.7.2 Test for luminaires with temperature sensing controls internal/external to the
) c b9 I: h b5 h3 { oballast or transformer
; i, E5 T4 `3 @ S3 e1 uThe luminaires shall be set up for this test as described in the first three paragraphs of 12.7.1.
& j( Y0 g2 H8 M2 w% [6 b: e) e
. _* T" a6 T U( ?The circuits subjected to abnormal conditions shall be operated with a slowly and steadily
5 p" n+ a5 a0 {9 r2 {/ a+ b: mincreasing current through the windings until the temperature sensing control operates.
* K% _0 K) o; X: B0 h* fTime intervals and increments in current shall be such that thermal equilibrium between/ H* J' u: f; N7 n0 M& `- b
winding temperatures and temperature of fixing points and most thermally influenced exposed- M Y3 R* z( n V
parts is achieved as far as is practicable. During the test, the highest temperature of the spots; h+ N$ W' S9 Z% R/ G! Q
tested shall be continuously measured." s9 X% m6 L5 {! ^ ~
For luminaires fitted out with manual-reset thermal cut-outs, the test shall be repeated six
' y6 K! P( G. Ktimes allowing 30 min intervals between tests. At the end of each 30 min interval, the cut-out& s7 e. S V4 w0 C! I) ~, v$ |
shall be reset.
) U) U# j# S' w7 \8 w1 SFor luminaires fitted out with auto-reset thermal cut-outs, the tests shall be continued until a+ O+ r% e$ }. Q4 I" l
stable temperature is achieved.7 O1 b4 e/ ]5 M0 b5 C1 C
Compliance# b' U- |- k3 C: Y- X
The highest temperature of the fixing points and most thermally influenced exposed parts,
8 k! x2 p& x& Q+ Fshall not exceed the temperature of deflection under load of the material according to the$ \$ X* P1 o9 D# J5 h& j0 C
method A as defined in ISO 75, at any time during the tests for thermal links, manual-reset# j) j2 N/ ]% z. v8 H8 G* j
thermal cut-outs, and auto-reset thermal cut-outs.0 ]! W! A8 H6 z2 V4 ~" W
In applying the requirements of 4.15 and 12.7 the following notes are to be referred to:4 H. C# l( G+ f( |. z/ M
NOTE 1 - ‘Fixing points’ means both the fixing points of components and the fixing points of a luminaire to the
! ]. D" j* y5 a9 \! ~mounting surface.$ `$ P+ O, T! m" |0 ~7 O
! {: ]! k H( d H' pNOTE 2 - ‘Exposed part’ means the outer surface of the luminaire enclosure.
. R' J% L3 |/ w5 d( ^2 fNOTE 3 - Measurement of exposed parts is restricted to those parts providing the luminaire/component fixing or) z8 u m+ J, V( g! L
parts providing a protective barrier against accidental contact with live parts, as required by section 8 of this
$ \- P6 B5 K" o9 p; g! [standard.8 X8 D3 S% {2 U$ c, b$ f5 i; j( R* i, C
NOTE 4 - The hottest part of the thermoplastic material section requiring test is measured. This may often be on
- V# w8 E5 Z0 [5 r K, jthe internal surface of a luminaire enclosure not the outer surface.
3 }/ `- ~9 U' Y# f" T! rNOTE 5 - The material temperature limits defined by clause 12.7 are with respect to materials under both/ l. i8 p" g* b9 G V
mechanical load and no mechanical load.
$ f' Q& |- x, \+ }% x% sNOTE 6 - The application of clause 12.7 must be read together with the requirements of sub-clause 4.15. |
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