Power Requirements
G-5
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.
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.
Table G-4: Clearance and Creepage
Clearance
X
mm
Creepage
Y
mm
Voltage used or
generated by other
parts of the host or
expansion bus
2.0
2.4 (3.8)
up to 50Vrms or Vdc
2.6
3.0 (4.8)
up to 125Vrms or Vdc
4.0
5.0 (8.0)
up to 250Vrms or Vdc
4.0
6.4 (10.0)
up to 300Vrms or Vdc
*See Note
*See Note
Above 300Vrms or
Vdc