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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances3 d' o. a O# X
incorporating tubular sheathed or embedded heating elements. However, controls are not 9 m( M1 Z( d2 l' l* L
short-circuited but one end of the element is connected to the sheath of the heating element.* H$ H5 `1 \/ f1 J
This test is repeated with the polarity of the supply to the appliance reversed and with the
4 R5 a9 N4 K5 y: A: R1 f2 e6 W, jother end of the element connected to the sheath.
" v3 I" ?* } b! Z; `The test is not carried out on appliances intended to be permanently connected to fixed wiring
# J4 T( B- [* B# p p) t* L+ cand on appliances where an all-pole disconnection occurs during the test of 19.4. # e& r6 L: ]: x( ~2 ?& y5 E
Appliances with a neutral are tested with the neutral connected to the sheath. . Z- m5 s, K& Z/ H% Y) _& t+ V X$ ^
NOTE For embedded heating elements, the metal enclosure is considered to be the sheath.0 P+ V0 k1 G: t' k& a
什么意思三相三线的取暖器需要测试吗
& t* `" n3 d! d2 o怎么测试$ P8 y2 l: _' O, f ^
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