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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances
- f, b" X0 v* u3 T" ?7 f0 z* yincorporating tubular sheathed or embedded heating elements. However, controls are not
4 ~' P2 t' i8 Xshort-circuited but one end of the element is connected to the sheath of the heating element.
, h s+ f7 C% u7 u5 Y6 @/ GThis test is repeated with the polarity of the supply to the appliance reversed and with the
& A8 B5 K8 j7 zother end of the element connected to the sheath. 1 n. s1 Q7 J D1 e+ O
The test is not carried out on appliances intended to be permanently connected to fixed wiring & z$ Z7 Y Q( ~/ s; J( l5 q
and on appliances where an all-pole disconnection occurs during the test of 19.4. 2 T2 N; _6 b/ `6 r) c
Appliances with a neutral are tested with the neutral connected to the sheath. - q: r* J( ^% ~' l* l {+ e
NOTE For embedded heating elements, the metal enclosure is considered to be the sheath.
+ l" o& I1 h& i r+ E' Q* I7 o什么意思三相三线的取暖器需要测试吗
! I0 _. m7 T7 x5 `! }1 M. x怎么测试$ B( B; q+ i ]3 M# v
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