Requirements for European Operation
114113-B Rev. 00
D-13
ISDN BRI Clearances and Creepage Distances
The clearances and creepage distances (shown as X and Y, respectively, in
Figure D-4 and Table D-13) must be maintained between the module and:
• The host chassis in which it is installed
• Any adjacent modules installed in the host chassis
The exception to this rule is the edge connector, which resides in the host chassis
backplane, where no minimum distance applies.
The creepage distances apply to the normal office environment. When the local
environment within the host chassis is subject to conductive pollution or dry,
nonconductive pollution that could become conductive due to condensation, the
creepage distances shown in parentheses in Table D-13
apply.
Figure D-4. ISDN BRI Clearances and Creepage Distances
SELV cards
Typical
host
chassis
Baseboard
ISDN module
AN0034A
X Y
X Y
X Y
