Nortel Networks Passport ARN Routers - Manual (Page 157)

Requirements for European Operation
114200-E Rev 00 D-15
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-15 apply.
The clearance and creepage distance between adjacent points should be checked
as follows:
• The clearance distance (X) is the shortest distance between two points
measured through the air.
• The creepage distance (Y) is the shortest distance between two points
measured across a surface.
If in doubt about calculating these distances, obtain advice from a competent
telecommunications safety engineer. Failure to install the ISDN BRI or serial
adapter module according to these instructions invalidates the conditions of the
BABT General Approval agreement.