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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances
* s1 j q5 x5 R' ~1 N1 a3 ~incorporating tubular sheathed or embedded heating elements. However, controls are not 9 s- v6 U ^, J' v4 e' \: t
short-circuited but one end of the element is connected to the sheath of the heating element.8 y( V9 ^9 p9 t9 `6 C( Z
This test is repeated with the polarity of the supply to the appliance reversed and with the - g" f3 s) {5 K- `
other end of the element connected to the sheath. - {6 A5 j; X, F8 D# ?$ z/ [
The test is not carried out on appliances intended to be permanently connected to fixed wiring
9 P8 Z2 Y& S1 s( t# i9 K1 m$ ?: kand on appliances where an all-pole disconnection occurs during the test of 19.4. # S/ L e( p" y! Q- @/ E
Appliances with a neutral are tested with the neutral connected to the sheath. . D3 m! e4 V& m) A$ _
NOTE For embedded heating elements, the metal enclosure is considered to be the sheath.# c9 b+ C% v8 X
什么意思三相三线的取暖器需要测试吗' U; [. C3 m. w6 E5 n0 r' E
怎么测试/ A& D4 ~! Q4 V6 c; ~
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