Rockwell Automation 1797-PS1N FLEX Ex 85-250V AC In/Quad-Ex DC Out Power Supply - 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