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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances
% |7 V* }3 }. ?0 dincorporating tubular sheathed or embedded heating elements. However, controls are not , _! W, }; V# ]' @; g! A
short-circuited but one end of the element is connected to the sheath of the heating element.# \# P5 r9 W9 ~% z
This test is repeated with the polarity of the supply to the appliance reversed and with the 0 L: ]5 W0 E6 |8 n& N+ N) G
other end of the element connected to the sheath.
' h& \/ q& y# q& iThe test is not carried out on appliances intended to be permanently connected to fixed wiring
' d* } _: p# W) q |, @and on appliances where an all-pole disconnection occurs during the test of 19.4. + f+ F2 o3 m* I; [# g
Appliances with a neutral are tested with the neutral connected to the sheath.
( m# z: b6 v. }. C* PNOTE For embedded heating elements, the metal enclosure is considered to be the sheath.5 r8 M2 s0 u0 @% l6 O! j
什么意思三相三线的取暖器需要测试吗" v$ j4 d* w# k+ V
怎么测试
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