If ground offset voltages generated in the power distribution system are excessive,
data transmission across interface buses can be affected. Significant performance
degradation or possible data corruption could result. SH043-series cabinets are
shipped with a ground strap (Digital part number 12–13756–A8) that is connected
to the rear of the unit. For optimum safety and performance, Digital recommends
that the ground strap be connected to the chassis of the
host system.
Make sure that site power distribution systems meet local electrical codes prior to
the installation of SH043-series cabinets.
To make sure that the power distribution system will perform satisfactorily, a
power system survey should be done before installation. The following areas
should be investigated:
• Do all outlets have power ground connections?
• Do the power cables on all equipment at the site have grounding prongs?
• Are all power outlet neutral connections isolated from ground?
• Are the grounds for all outlets connected to the same power distribution
panel?
• Are all devices that are connected to the same breaker as the SH043
cabinet Underwriter’s Laboratories (UL) or International Electrotechnical
Commission (IEC) approved?
CAUTION
If there is a deficiency found in any area during the power survey, a
qualified electrician must correct it before installation may begin. Failure
to resolve power survey deficiencies before installing the equipment may
result in personnel injury as a result of electric shock.
If no problems are found during the survey, the site grounding system may be
considered to be adequate for personnel safety and reliable SH043-series cabinet
operation.
Site Preparation 2–3
