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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances
- h2 `- z# j' t4 qincorporating tubular sheathed or embedded heating elements. However, controls are not ) H6 p/ i5 Z3 Q! b9 |# P) a# Z0 a
short-circuited but one end of the element is connected to the sheath of the heating element.7 T: U& L6 r# \ W5 \0 j
This test is repeated with the polarity of the supply to the appliance reversed and with the
3 q. o0 O; H& i6 Cother end of the element connected to the sheath.
* j) ~1 l8 t( D6 ~; ]9 A7 a( HThe test is not carried out on appliances intended to be permanently connected to fixed wiring
! e# u$ c1 C6 k: uand on appliances where an all-pole disconnection occurs during the test of 19.4.
& C4 z2 g6 H p/ bAppliances with a neutral are tested with the neutral connected to the sheath.
# G" O! N& M i, U' E$ o2 v9 n) GNOTE For embedded heating elements, the metal enclosure is considered to be the sheath.! W" C. v) U% X6 z5 a5 X2 i
什么意思三相三线的取暖器需要测试吗
# q7 U7 F: U$ u- a2 M7 c g" R怎么测试1 _* m, v- u, E% e9 f
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