Rockwell Automation 1797-PS1N FLEX Ex 85-250V AC In/Quad-Ex DC Out Power Supply User Manual
Page 16
16 FLEX Ex 85…250V ac In/Quad-Ex dc Out Power Supply
Publication
1797-5.34 - September 2011
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.
Wiring methods must be in accordance with the NEC, ANSI/NFPA 70,
Article 501.
For mounting of the power supply, conduit runs must have sealing
fittings at the entry of the enclosure.
Nonhazardous
Location
24V dc To Next Power
Supply 1797-PS1N
24V
Power
Supply
Nonintrinsically
Safe Wiring
Intrinsically Safe Wiring
To any IS device with
entity concept
parameters of (V
max
,
I
max
, C
i
, L
i
) appropriate
for connection to
associated apparatus
with entity concept
parameters listed in
Table 5.
43515
Hazardous (Classified) Location
1797-PS1N
Class I, Division 1, Groups B, C, D
11
Hazardous (Classified) Location
1797-PS1N
Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Groups E, F, G
Class III Division 1
Class I Zone 1 IIC