T4000 Dc Power Electrical Safety Guidelines; Figure 153: Placing A Component Into An Antistatic Bag - Juniper T4000 Hardware Manual

T4000 Core Router Hardware Guide
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T4000 DC Power Electrical Safety Guidelines

424

Figure 153: Placing a Component into an Antistatic Bag

CAUTION
ELECTROSTATIC
SENSITIVE
DEVICES
DO NOT OPEN OR HANDLE
EXCEPT AT A
STATIC-FREE WORKSTATION
CAUTION: ANSI/TIA/EIA-568 cables such as Category 5e and Category 6
can get electrostatically charged. To dissipate this charge, always ground
the cables to a suitable and safe earth ground before connecting them to the
system.
General Safety Guidelines and Warnings on page 393
The following electrical safety guidelines apply to a DC-powered router:
Incorporate an easily accessible disconnect device into the facility wiring. In the United
States and Canada, the –48 VDC facility should be equipped with a circuit breaker
rated a minimum of 125% of the power provisioned for the input in accordance with
the National Electrical Code in the US and the Canadian Electrical Code in Canada.
WARNING: Failure to provide the required circuit breaker or current-limiting
fuse for each DC power cable can cause injury or damage to equipment.
Each 48 VDC facility DC source input power cable must be equipped with a
current-limiting fuse or circuit breaker external to the Juniper Networks equipment
rated at 100 A (–48 VDC) maximum for the six-input DC power supply, or as required
by local code. The voltage rating of the facility DC source circuit breaker must be 80
V minimum. We recommend an 80 A circuit breaker or current-limiting fuse rated for
each 60 A DC power cable. We recommend a 100 A circuit breaker or current-limiting
fuse rated for each 80 A DC power cable
The marked input voltage of –48 VDC for a DC-powered router 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.
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