Power Requirements 6
Site Preparation 6-3
Power Requirements
• Mains Disconnect
• Power Drop
• Basic Power Quality Survey
• Connecting Power to the PDU
Mains Disconnect
A mains disconnect — providing over-current and short-circuit protection — must
be provided for the system. The mains disconnect should be in the form of a
multi-pole circuit breaker.
The mains disconnect must:
• Comply with UL 489/CSA C22.2 No.5 standard; rated current 20 A or below.
• Open all line conductors and neutral conductors where local code applies, but
not the protective earth conductor.
• Be marked “System Mains Disconnect” or the equivalent in your local language
• Be marked with a “|” for the “On” position or “O” for the “Off” position.
• Be capable of being locked in the “Off” position, but not in the “On” position.
• Be installed within 3 meters of the system, where it can be easily reached by
the system operator without requiring the system to be moved to access the
disconnect.
• Be rated for a minimum of 10,000 amps interrupting capacity (AIC) if used on a
200–240 volt circuit, or 14,000 AIC if used on a higher voltage circuit.
Figure 6-1 Wiring diagram
20 A / 3-Ph breaker
or three 20 A fuses
System
PDU
Installation site
Existing breaker from Series 5 installation
30 A / 3-Ph breaker
or three 30 A fuses
New breaker for Series 6
Keysight
equipment
AC Voltage Source
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