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19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances' V( S$ p- Q9 J) W' I
incorporating tubular sheathed or embedded heating elements. However, controls are not 1 m+ n+ \6 l8 @% P. N* D
short-circuited but one end of the element is connected to the sheath of the heating element.- o" g) g: q" h( y7 G. b; M# q
This test is repeated with the polarity of the supply to the appliance reversed and with the
3 u& J" `. K3 I; M" pother end of the element connected to the sheath. - t( P% {$ I+ t9 ^
The test is not carried out on appliances intended to be permanently connected to fixed wiring
% s s9 N0 j3 w0 U" ?and on appliances where an all-pole disconnection occurs during the test of 19.4.
* @% `- `* H8 j3 G* Z( K& I2 QAppliances with a neutral are tested with the neutral connected to the sheath.
5 m6 i" V8 E1 B9 G* GNOTE For embedded heating elements, the metal enclosure is considered to be the sheath.
' t3 S" N! ?5 O什么意思三相三线的取暖器需要测试吗
4 ^! _, `+ W2 C* K, y怎么测试( I" E ? _5 u8 @/ u& W# v- c
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