|
19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances4 @4 k( j. Y7 v. j7 x
incorporating tubular sheathed or embedded heating elements. However, controls are not
1 z& ^% N1 W7 l$ b6 r1 E# tshort-circuited but one end of the element is connected to the sheath of the heating element.
5 F, T- b- r6 v; p4 c7 YThis test is repeated with the polarity of the supply to the appliance reversed and with the
! P# f$ m# D# W. ?9 z6 ~8 Tother end of the element connected to the sheath.
% X, t! F, m- f H- FThe test is not carried out on appliances intended to be permanently connected to fixed wiring
: u9 w$ P- ^& y: f, land on appliances where an all-pole disconnection occurs during the test of 19.4. 4 d. d; W8 [5 l" @0 l
Appliances with a neutral are tested with the neutral connected to the sheath.
" `: k7 [* \; i; ENOTE For embedded heating elements, the metal enclosure is considered to be the sheath.# M f/ P2 D% s+ s. r. k
什么意思三相三线的取暖器需要测试吗
; N0 Y+ R1 t! ^& \# ^怎么测试
! @( H3 \- q9 c |
|