Nortel Passport 7400, Hardware Installation, Maintenance, And Troubleshooting, Page: 283 / 438

Chapter 37 Hardware procedures 283
Passport 7400 Hardware Installation, Maintenance, and Upgrade 5.2S1
Installing ferrite beads onto dc power cables
Install ferrite beads onto the dc power input cables of a Passport 7400 switch
to ensure that the cables comply with the Class B containment of
electromagnetic interference (EMI) standard. (ferrite bead kit NTJS6381)
Prerequisites
• Ensure the power cables are not too large for the beads. The ferrite bead
kit, which contains 3 ferrite beads and 6 tie-wraps, accommodates cable
pairs up to 2.5 cm (1 inch) in diameter. This includes cables sizes from
No. 10 to 6 AWG (5.26 mm2 to 13.30 mm2 or 4.0 mm2 to 16 mm2 for
the full acceptable range).
• Before installing the ferrite beads, the power input cables must be
installed and connected to the switch.
WARNING
Risk of injury or equipment damage by electricity
If the barrel of any power input cable lug shows exposed
metal near the edge of the insulation panel, that is, an
uninsulated portion, contacting that metal risks
electrocution or equipment damage. If any lug barrel is
uninsulated, you must power down the switch and its
upstream power feed and fully insulate the lug barrels
before adding any ferrite beads.
WARNUNG
Verletzungsgefahr oder Geräteschäden durch
Elektrizität
Falls die Hülse eines Stromeingangskabelschuhs am
Rand der Isolierverkleidung blankes Metall, also einen
unisolierten Bereich, aufweist, besteht beim Berühren
dieses metallenen Bereichs Lebensgefahr bzw. es
können Geräteschäden auftreten. Bei einer unisolierten
Hülse müssen Sie den Schalter sowie dessen Upstream-
Stromzufuhr ausschalten und die Kabelschuhhülsen
vollständig isolieren, bevor Sie Ferrit-Dämpfungsperlen
einsetzen.