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The exception to this requirement is the edge connector, which is
located in the host chassis power and data bus slots, where no
minimum distance applies.
Table G-4: Clearance and Creepage
Clearance X mm
2.0
2.6
4.0
4.0
*See Note
Note: For a host or other expansion card fitted in the host,
using or generating voltages greater than 300V (rms or
dc), advice from a competent telecommunications safety
engineer must be obtained before installation of the
relevant equipment.
The creepage distances shown apply in a normal office
environment. Where the local environment within the host chassis
is subject to conductive pollution or dry nonconductive pollution
which could become conductive due to condensation, the creepage
distances shown in parentheses will apply. The clearance and
creepage between adjacent points should be checked as follows
(refer to Figure G-1):
The clearance distance (X) is the shortest distance measured
!
between two points through the air.
The creepage distance (Y) is the shortest distance between two
!
points measured across a surface.
The user should obtain advice from a competent
telecommunications safety engineer if in doubt.
Creepage Y mm
2.4 (3.8)
3.0 (4.8)
5.0 (8.0)
6.4 (10.0)
*See Note
Power Requirements
Voltage used or
generated by other
parts of the host or
expansion bus
up to 50Vrms or Vdc
up to 125Vrms or Vdc
up to 250Vrms or Vdc
up to 300Vrms or Vdc
Above 300Vrms or
Vdc
G-5
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