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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances4 C/ q; T! `& o; S: h: d3 J
incorporating tubular sheathed or embedded heating elements. However, controls are not * q0 z: C1 O) |- |' h# U5 d5 u! \
short-circuited but one end of the element is connected to the sheath of the heating element.) R7 l. p4 D9 t
This test is repeated with the polarity of the supply to the appliance reversed and with the
2 z4 J6 l: K. Z, ~# i) X- B2 Iother end of the element connected to the sheath.
9 ^+ G+ D5 d) J l, p1 z" C, CThe test is not carried out on appliances intended to be permanently connected to fixed wiring / u6 q0 X/ ?! C, b- H# O( s
and on appliances where an all-pole disconnection occurs during the test of 19.4.
- i& N7 C+ T# c+ u5 S A" X1 DAppliances with a neutral are tested with the neutral connected to the sheath. 1 U* n7 f3 e6 A4 k: r) u3 v6 T
NOTE For embedded heating elements, the metal enclosure is considered to be the sheath.
) C: }7 Q- E2 Y& B什么意思三相三线的取暖器需要测试吗, j( M" w$ L6 @3 g" G$ F
怎么测试; ~3 o2 C A+ ?- L
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