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Safety: Warnings
4 InfraStruXure System - Installation and Start-Up
DANGER—Risk of Electric Shock!
Electrical Hazard: Hazardous, live parts inside the Symmetra PX UPS are energized from
the battery supply even when the AC power is disconnected.
Hazardous, live parts may exist inside the InfraStruXure PDU because of the Symmetra PX
UPS inverter even when the AC power is disconnected. Test any electrical parts before
touching them.
Emergency Power Off (EPO)
Hazardous voltage from the branch circuit must be isolated from the 24VAC, 24VDC, and contact
closure. 24VAC and 24VDC are considered Class 2 circuits as defined in Article 725 of the National
Electrical Code (NFPA 70) and Section 16 of the Canadian Electrical Code (C22.1).
A Class 2 circuit is a source having limited voltage and energy capacity as follows:
a. If an Inherently Limited Power Source, voltage and energy are limited to less than 30VAC, less
than 30VDC, and 8A.
b. If not an Inherently Limited Power Source, voltage and energy are limited to less than 30VAC,
less than 60VDC, 250VA, and the current is limited to 1000/Vmax. The fuse is limited to 5A if
less than 20VAC or 20VDC, or 100/Vmaximum if less than 30VAC or 60VDC.
If you choose to use a 24VAC, 24VDC, or contact closure connection to the EPO, use one of the
following UL-listed wire types:
• CL2 Class 2 cable for general purpose use
• CL2P Plenum cable for use in ducts, plenums, and other space used for environmental air
• CL2R Riser cable for use in a vertical run shaft from floor to floor
• CL2X Limited Use cable for use in dwellings and for use in a raceway
• For installation in Canada, the cable should be CSA Certified, type ELC (extra-low-voltage control
cable).
If you do not use a CL2 cable, route the EPO wiring in conduit that does not contain any branch circuit
wiring.
EMI
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with this user
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference. The user will bear sole responsibility for
correcting such interference.
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numerique de le class A est conforme a la norme NMB-003 du Canada.