CHECKS AFTER REPAIR AND MAINTENANCE
Checking the protective leads
The correct connection and condition
is
checked by visual control and by measuring the resistance
be-
tween the protective-lead connection at the plug and the cabinet.
The resistance should
be
<
0.5
!2
.
During measurement the mains cable should be moved. Resistance
variations indicate a defect.
Checking the insulating resistance
Measure the insulating resistance at
U-
=
500
V
between the mains connection and the protective lead
connection. For this purpose set the mains switch to
ON.
The insulating resistance should
be
>
2
M
a.
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