Calculating System Thermal Output; Ac Power Circuit Breaker Requirements - Juniper MX204 Hardware Manual

Calculating System Thermal Output

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AC Power Circuit Breaker Requirements for the MX204 Router
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Documentation
Copyright © 2018, Juniper Networks, Inc.
Table 23 on page 45 lists the power requirements for the fully configured AC-powered
routers operating under maximum voltage conditions.
Table 23: MX204 Router AC Router Power Requirements at Maximum Temperature (55°
C)
Chassis Configuration
Fully configured chassis
running at high activity
After you have calculated the power consumption for your configuration, you can use
that information to determine the system thermal output (BTUs per hour). To do so,
multiply the power consumption in watts by 3.41.
For example, in Table 22 on page 44
configured chassis running at high activity at 25° C typical temperature to be 240 W.
Using that information we can calculate the system thermal output for the configuration:
Power consumption in watts * 3.41 = system thermal output in BTU/hr
240 W * 3.41 = 818.4 BTU/hr
MX204 Power System Description on page 21
Replacing an MX204 AC Power Supply on page 97
AC Power Cord Specifications for MX204 Routers on page 46
AC Power Circuit Breaker Requirements for the MX204 Router on page 45
General Safety Guidelines and Warnings on page 133
General Electrical Safety Guidelines and Warnings on page 155
Prevention of Electrostatic Discharge Damage on page 156
We recommend that you use a dedicated customer-site circuit breaker rated for
20 A (110 VAC) minimum or 16 A (220 VAC) minimum for each AC power feed, or as
required by local code. Doing so enables you to operate the router in any configuration
without upgrading the power infrastructure.
MX204 Power System Description on page 21
Replacing an MX204 AC Power Supply on page 97
Power Consumption for an AC-Powered MX204 Router on page 44
General Safety Guidelines and Warnings on page 133
General Electrical Safety Guidelines and Warnings on page 155
Chapter 8: AC Power Requirements, Specifications, and Guidelines
Power Requirement at 55° C
(Watts)
280 W
we calculated the power consumption for a fully
Power Requirement (Watts)
with 90% Efficiency
311 W
45