32 Researching the requirements
Auxiliary power requirements
Integrated terminals, printers, modems, and data units require local power.
Power for devices located in the equipment room must meet the following
criteria:
-
wired and fused independently of all other receptacles
-
tagged at the power panel to prevent unauthorized interruption of power
-
not controlled by a switch
-
referenced to the same building interface point on the building system
ground as the SL-1 AC panel ground
Isolated service receptacles
For isolated ground systems, the auxiliary power receptacles used should be
12OV, 6OHz, 15A, individually fused, isolated ground circuits terminating
on NEMA non-locking type IG 5-15 such as Hubbell, Cat. No. IG-5262,2-
Pole, 3-Wire, orange duplex receptacles. A green conductor must be used
for extending the safety ground and must be wired according to the isolated
ground specifications.
Note:
This requirement is based on safety concerns and exceeds
NRC/CRC requirements.
Non-isolated service receptacles
For non-isolated ground systems, the auxiliary power receptacles used
should be 12OV, 6OHz, 15A, individually fused circuits terminating on
NEMA non-locking type 5-15.
In non-isolated ground systems auxiliary equipment which connects to the
SL-1 system should be isolated through the use of fiber optic signal cables
such as RS-232-C. Failure to provide this isolation will defeat the single
point ground.
Power Fail Transfer Unit (PFTU) powering
The PFIXJ, when used with AC systems, operates with a separate 120 V ac
to 48 V dc power supply. If the AC system is not backed-up (for example,
when no UPS is present), the
PFIU
power supply requires a separate and
dedicated auxiliary power outlet. Power to the PFTU is terminated when
the system power goes down and vice versa.
Installation planning 553-3001-120