Rockwell Automation 1797-PS2N2 FLEX Ex Power Supply User Manual
Page 18
18 FLEX Ex Power Supply
Publication
1797-5.12 - June 2010
The entity concept allows interconnection of intrinsically safe apparatus
with associated apparatus not specifically examined in combination as a
system when the approved values of V
oc
and I
sc
of the associated apparatus
are less than or equal to V
max
and I
max
of the intrinsically-safe apparatus and
the approved values of C
a
and L
a
of the associated apparatus are greater than
C
i
+ C
cable
and L
i
+ L
cable
respectively for the intrinsically-safe apparatus.
Wiring methods must be in accordance with the NEC, ANSI/NFPA 70,
Article 504 (Division) or 505 (Zones).
Wiring methods must be in accordance with the NEC, ANSI/NFPA70
Article 501 (Divisions).
Conduit runs must have sealing fittings at the entry of the enclosure.
The wiring contained within the nonintrinsically-safe wiring
compartment and the intrinsically-safe wiring compartment shall be separated
from each other. Care must be taken to guarantee the separation of
nonintrinsically-safe and intrinsically-safe wiring. The partitions within the
power supply provide the necessary isolation for the electronics and the
wiring, however, extreme care must be taken to guarantee wires are contained
within their appropriate compartment and cannot contact any of the
electronics.
Cable must be rated at a minimum of 100 °C (212 °F).
Warning: Keep cover tightly closed when circuits are alive.
After disconnecting power supply, wait 15 minutes before removing
cover.
No live maintenance.
5