2. Transportation, Storage and Installation
2-53
TI 33J01J10-01EN
Mounting conditions
• The NIU shall be mounted with a 2-unit or more space from the ceiling of the junction box.
The following shows how to mount N-IO nodes (mixture of Intrinsic Safety barrier and Non-
Intrinsic Safety barrier) in a junction box:
F020525.ai
Junction Box
Non-mounting area (1unit or more)/Wiring is possible
NIU
Heat-generating
device mountig area
(max. 20 W)
IOBP_IS
IOBP
Non-mounting area (2 units or more) /
Wiring is possible
Non-mounting area
/ Wiring is possible
(30 mm or more)
Heat-generating device non-mounting
area (under the N-ESB Bus module)
Wiring is possible
Field wiring area
Wiring area
NIU
Power supply unit
Power supply unit
IOBP
Figure Example of Mounting N-IO Nodes (Mixture of Intrinsic Safety Barrier and Non-Intrinsic Safety
Barrier) in a Junction Box
The wiring that will be intrinsic safety circuits must be installed so that they are electrically
separated from the wiring of non-intrinsic safety circuits, including the in-cabinet wiring. Install the
wiring according to the IEC 60079-14 standards or the requirements for explosion-proof wiring of
the country where the system is used.
Mar. 29, 2019-00
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