|
19.5 The test of 19.4 is repeated on class 0I appliances and class I appliances% T/ A/ I2 o# a4 w1 V
incorporating tubular sheathed or embedded heating elements. However, controls are not
/ N# F. C0 Y/ ^, e: ^; k) D- Wshort-circuited but one end of the element is connected to the sheath of the heating element.( O# U% p/ s' y
This test is repeated with the polarity of the supply to the appliance reversed and with the 2 O) t, h4 F; p' Z8 Z
other end of the element connected to the sheath.
& r! W9 [; k! F* c: H( l* w' lThe test is not carried out on appliances intended to be permanently connected to fixed wiring ) U% @4 P* q0 g% _- P# s9 |
and on appliances where an all-pole disconnection occurs during the test of 19.4.
1 q* V& k8 V, o' v7 mAppliances with a neutral are tested with the neutral connected to the sheath.
6 J( O5 o* |9 xNOTE For embedded heating elements, the metal enclosure is considered to be the sheath.- |4 l( a& i. Z* v& ~) q
什么意思三相三线的取暖器需要测试吗
( {1 P! R9 F. `1 R7 U0 N2 U% f怎么测试
/ c" o- [! Q8 U% u1 S |
|