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12.7 Thermal test in regard to fault conditions in lamp controlgear or electronic
! x) }* c# d vdevices in plastic luminaires
; e$ \' i+ H/ Q4 {' ?) UThe test applies only to luminaires with a thermoplastic housing not fitted with an extra
0 l; K4 ~& T9 L/ }6 L; r. Zmechanical temperature-independent device as per 4.15.2.6 S' o/ t2 }0 Z2 Z2 F2 Z( c. T% g
% K! P, b7 s" _/ p0 ^" _9 ~6 a
12.7.1 Test for luminaires without temperature sensing controls
$ \( x# g8 d; j: y# MThe luminaire shall be tested under the conditions specified in items a), c), e), f), h) and l) of
6 o2 e8 G" _: |. y! c& U& K/ I: v12.4.1. In addition, the following also applies.! e) T, M% X5 _' E/ H
20 % of the lamp circuits in the luminaire, and not less than one lamp circuit, shall be
* e3 ^5 K$ K/ R0 K( p7 N( f+ {subjected to abnormal conditions (see item a) of 12.5.1).
# x3 H* a5 f( L9 v Z8 ^The circuits which have the most thermal influence on the fixation point and exposed parts7 }; C2 h; t; x
shall be chosen and other lamp circuits shall be operated at rated voltage under normal
& c" E1 u9 ?- l& @conditions.# y; N7 l3 {3 h% c+ }! T, _# I
The circuits subjected to abnormal conditions shall be operated at 1,1 times (the rated voltage
+ ]- F9 H4 Q r5 N7 A3 Jor the maximum of the rated voltage range). When conditions are stable, the highest winding- r0 j" z/ i# g
temperature and highest temperature of fixing points and most thermally influenced exposed1 U( {; \7 _) N, H, u0 ^1 Y! J# A
parts shall be measured. It is not necessary to measure the temperature of small wound
& _4 z; o" z9 l$ r& Qdevices that are incorporated within electronic circuits.
+ i. a( Q: p' ~) |' Z" u& V6 kCompliance
3 W5 T6 `2 M" eThe values of the ambient temperature and the temperature measured at 1,1 times (the rated$ m) |) k3 ~4 Y6 ]& F+ t
voltage or the maximum of the voltage range) are used for the linear regression formula in: n7 S C$ ]- L
calculating the temperature of fixing points and other exposed parts in relation to a
: e6 B. v6 q+ f/ c, Mballast/transformer winding temperature of 350 °C. The calculated value shall not exceed the
, @; r, S! @+ Ctemperature of the deflection under load of the material in accordance with method A as
& A6 q5 _0 h0 [3 }8 ydefined in ISO 75 (1987), Plastics and ebonite – Determination of temperature of deflection
0 S& _) w1 I; b: J8 q+ nunder load.
/ I* \% p( @8 x7 e12.7.2 Test for luminaires with temperature sensing controls internal/external to the6 E6 ]7 K2 \2 b
ballast or transformer' L/ a, R& C3 }) m
The luminaires shall be set up for this test as described in the first three paragraphs of 12.7.1.4 x1 I2 _" d& w
. D% g8 ~( p. i5 _ [7 UThe circuits subjected to abnormal conditions shall be operated with a slowly and steadily& E( G: K J: N8 m) A. C2 i9 t0 S
increasing current through the windings until the temperature sensing control operates.4 }( ] E9 A: g! i5 @
Time intervals and increments in current shall be such that thermal equilibrium between# X& ^* T# g3 `! a- F$ X' r
winding temperatures and temperature of fixing points and most thermally influenced exposed
: N, P9 @9 |! P: w9 P' I* l) Fparts is achieved as far as is practicable. During the test, the highest temperature of the spots/ [7 @, \# f' R. }5 \+ M1 S
tested shall be continuously measured.- Q8 m" I0 Q4 B! U- X3 \) j
For luminaires fitted out with manual-reset thermal cut-outs, the test shall be repeated six
8 q, }. T- j3 m5 f' Mtimes allowing 30 min intervals between tests. At the end of each 30 min interval, the cut-out
& n9 P) A4 V" l* Z- A/ ]" mshall be reset.
6 ?4 j Z- g5 U; _For luminaires fitted out with auto-reset thermal cut-outs, the tests shall be continued until a
+ j F' `0 }8 Ystable temperature is achieved.3 \4 H5 w: Z/ ?4 N; O; k, @8 `0 Z
Compliance4 t" u: E9 c2 k. ]1 b, K
The highest temperature of the fixing points and most thermally influenced exposed parts,
! @" v: T. C* Pshall not exceed the temperature of deflection under load of the material according to the
9 R# u" \ z& Q9 ]- T2 B0 tmethod A as defined in ISO 75, at any time during the tests for thermal links, manual-reset
, y: {7 A* R4 p% }thermal cut-outs, and auto-reset thermal cut-outs.
2 q1 s5 K) i# I: t- zIn applying the requirements of 4.15 and 12.7 the following notes are to be referred to:4 @- H/ ]9 f7 c
NOTE 1 - ‘Fixing points’ means both the fixing points of components and the fixing points of a luminaire to the
( T% Z0 i4 [- g% G vmounting surface.$ I L1 H" p+ @1 Q
m. l H9 g4 }0 z9 s& x1 q* kNOTE 2 - ‘Exposed part’ means the outer surface of the luminaire enclosure.. |) p; d- ~! T% l1 ^; }
NOTE 3 - Measurement of exposed parts is restricted to those parts providing the luminaire/component fixing or
4 W7 U [2 l; ^0 P5 C0 o8 xparts providing a protective barrier against accidental contact with live parts, as required by section 8 of this
n& q% l# O5 B d5 `: m+ O! J7 mstandard.
8 A$ u$ Z4 G0 W3 z$ D& JNOTE 4 - The hottest part of the thermoplastic material section requiring test is measured. This may often be on$ V. w1 [" L; m! e) M8 q8 B2 N
the internal surface of a luminaire enclosure not the outer surface.
$ H# P9 }9 l, i% y, x# p8 TNOTE 5 - The material temperature limits defined by clause 12.7 are with respect to materials under both
) E: _( v8 n3 L$ a7 n6 v5 Mmechanical load and no mechanical load. H2 M0 m# Z4 S! P
NOTE 6 - The application of clause 12.7 must be read together with the requirements of sub-clause 4.15. |
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