Juniper Networks EX4200 - Manual (Page 268)

■ For personal safety, connect the green and yellow wire to safety (earth) ground
at both the switch and the supply side of the DC wiring.
■ The marked input voltage of –48 VDC for a DC-powered switch is the nominal
voltage associated with the battery circuit, and any higher voltages are only to
be associated with float voltages for the charging function.
■ Because the switch is a positive ground system, you must connect the positive
lead to the terminal labeled RTN, the negative lead to the terminal labeled
–48 VDC, and the earth ground to the chassis grounding points.
Related Topics ■ General Safety Guidelines and Warnings for EX Series Switches on page 207
■ General Electrical Safety Guidelines and Warnings for EX Series Switches on
page 235
■ DC Power Disconnection Warning for EX Series Switches on page 242
■ DC Power Grounding Requirements and Warning for EX Series Switches on
page 244
■ DC Power Wiring Sequence Warning for EX Series Switches on page 245
■ DC Power Wiring Terminations Warning for EX Series Switches on page 246
■ Connecting DC Power to an EX3200 or EX4200 Switch on page 148
■ Connecting DC Power to an EX8200 Switch
DC Power Disconnection Warning for EX Series Switches
WARNING: Before performing any of the DC power procedures, ensure that power
is removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit breaker to
the OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Waarschuwing Voordat u een van de onderstaande procedures uitvoert, dient u te
controleren of de stroom naar het gelijkstroom circuit uitgeschakeld is. Om u ervan
te verzekeren dat alle stroom UIT is geschakeld, kiest u op het schakelbord de
stroomverbreker die het gelijkstroom circuit bedient, draait de stroomverbreker naar
de UIT positie en plakt de schakelaarhendel van de stroomverbreker met plakband
in de UIT positie vast.
Varoitus Varmista, että tasavirtapiirissä ei ole virtaa ennen seuraavien toimenpiteiden
suorittamista. Varmistaaksesi, että virta on KATKAISTU täysin, paikanna tasavirrasta
huolehtivassa kojetaulussa sijaitseva suojakytkin, käännä suojakytkin
KATKAISTU-asentoon ja teippaa suojakytkimen varsi niin, että se pysyy
KATKAISTU-asennossa.
Attention Avant de pratiquer l'une quelconque des procédures ci-dessous, vérifier
que le circuit en courant continu n'est plus sous tension. Pour en être sûr, localiser
le disjoncteur situé sur le panneau de service du circuit en courant continu, placer
242 ■ DC Power Disconnection Warning for EX Series Switches
Complete Hardware Guide for EX3200 and EX4200 Ethernet Switches