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SS7G21 and SS7G22 Signaling Servers Hardware Manual Issue 7
WARNING
IF DC POWER SUPPLIES ARE INSTALLED:
ISOLATION:
The product with DC input is to be installed in a Restricted Access Location in
accordance with articles 110-16, 110-17 and 110-18 of the National Electric Code,
ANSI/NFPA 70. The DC source must be electrically isolated by double or reinforced
insulation from any hazardous AC or DC source. The DC source must be capable of
providing up to 200 W of continuous power per feed pair. Connection to a DC source
should only be performed by a QUALIFIED SERVICE TECHNICIAN.
MAIN DC POWER DISCONNECT:
You are responsible for installing a properly rated DC power disconnect for the entire
rack unit. This DC power disconnect must be readily accessible, and it must be labelled
as controlling power to the entire rack unit, not just to this product.
GROUNDING THE RACK INSTALLATION:
To avoid the potential for an electrical shock hazard, you must reliably connect a safety
ground conductor to the product. The safety ground conductor must be a minimum
14AWG connected to the safety ground studs on the rear of the product, with a closed
two-hole crimp terminal. The nuts on the safety ground stud should be installed with a
10 in/lbs torque. The safety ground conductor provides proper grounding only for this
product. You must provide additional, proper grounding for the rack and other devices
installed in it.
OVERCURRENT PROTECTION:
Overcurrent protection circuit breakers must be provided as part of each host
equipment rack and must be installed between the DC source and this product. The
branch circuit protection shall be rated minimum 75 VDC, 10 Amps maximum per feed
pair. If the DC power system for the equipment rack is installed with more than 10
Amps of protection, you must provide supplemental protection for this product. The
overall current rating of this product configured with two power supplies is less than
4Amps.