DEC 3000 800, Owner'S Manual

Page: 270 / 318

Module Isolation
Module Isolation
Clearance
and Creepage
Defined Clearance and creepage distances must be maintained on your
54-21147 module. Clearance is the shortest distance in air
between two points. Creepage is the shortest distance along a
continuous surface between those same two points.
Creepage distances apply when the 54-21147 module system is
installed in a controlled environment. You can check creepage
distances by measuring the distance between adjacent parts.
If in doubt, you should seek the advice of a telecommunications
safety engineer. Failure to install the 54-21147 module in
accordance with these instructions will invalidate the approval.
Clearance
and Creepage
Distances Except at the connector that plugs into the host, clearance and
creepage distances of Xmm and Ymm, as listed in Table E–3,
must be maintained between the approved module and other
parts of the host, including expansion cards. Digital has ensured
that when the 54-21147 module is installed within the DEC 3000
Model 800/800S/900 AXP system, the creepage and clearance
distances to the host are met.
E–4 Special Information for PTT Network Users