Host Independent Approvals; Clearance And Creepage Specs For Pmba-Aa - DEC Personal DECstation 5000 User Manual

Regulatory Information for the UK
E.4 Host Independent Approvals
E.4 Host Independent Approvals
The PMBA-AA is approved only for installation in an approved host with
approved attachments. For approval, the host and host attachments must be
either of the following:
• Type-approved (meaning the equipment is built exactly like the models
that were originally approved).
• If the equipment was supplied after 1st March 1989, it must be marked
with or supplied with a statement that the host is supplied under General
Approval Number NS/G/1234/J/100003.
Except at the edge connector which plugs into the host's expansion slot,
clearance and creepage distances of Xmm and Ymm, as listed below must be
maintained between the PMBA-AA and other parts of the host, including any
other expansion cards fitted.
Table E–2 Clearance and Creepage Specs for PMBA-AA
Clearance
Xmm
2.0
2.6
4.0
4.0
1
Used or generated by other parts of the host or expansion card (Vrms or Vdc)
The creepage distances apply when installed in a normal office environment.
The creepage distance shown in parentheses apply where the local environment
within the Host Computer is subject to conductive pollution or dry non-
conductive pollution which could become conductive due to condensation.
These distances can be checked by measuring between the adjacent parts.
Clearance is the shortest distance in air between two points. Creepage is the
shortest distance along continuous solid parts between the same two points.
If in doubt, advice should be obtained from a competent telecom safety
engineer. Failure to install the PMBA-AA in accordance with these instructions
will invalidate the approval.
E–4 Regulatory Information for the UK
Creepage
Ymm Voltage
2.4 (3.8) up to 50
3.0 (4.8) up to 125
5.0 (8.0) up to 250
6.4 (10.0) up to 300
1