Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
3-6
ELECTRICAL
INSTALLATION
Electrical Connections
on Wall Mount Models
All field wiring connections are accessible by removing the lower terminal
cover, which is secured by two screws on the IP-rated version, and by four
screws on the NEMA 4X rated version.
NOTE:
It is the responsibility of the installer to:
• Refer to safety data and electrical specifications in Appendix A.
• Refer to Product Certifications and Control Drawings in Appendix B
• Check and obtain any hazardous area work permits required before
applying power to the control unit.
• Observe all local regulations and approval requirements.
• Ensure the wiring is suitable for the load current.
• Ensure wiring insulation is suitable for the voltage, temperature, and
environment of the installation.
Never remove or modify the mechanical barriers separating the terminal area
from the main enclosure, and separating the transmitter input terminals from
other terminals.
Figure 3-2 shows the layout of the external connection terminals. All of the
terminal blocks are suitable for wires 14 to 26 AWG (0.5mm
2
to 1.5mm
2
),
except the mains terminals which are suitable for wires 10 AWG (2.5mm
2
).
Insulation should be stripped back
1
/4” (7mm).
NOTE:
For field wiring, use 167°F (75°C) copper conductors only.
Cable gland notes for IP-rated Wall Mount
Two cable glands, rated IP65 and suitable for cable with outside diameter
4mm to 7mm, are supplied for use with the mains supply and transmitter
cable. M20 blanking plugs are supplied for the other three cable entry
positions.
All glands and blanking plugs are supplied in a plastic bag. The installer must
fit these, or suitable equivalents, in place of the transit red-caps, to ensure
weatherproofing of the control unit.
Note that the white sealing washers supplied with the cable glands and
blanking plugs must be fitted on the outside of the enclosure under
gland/blanking plug.
It is the responsibility of the user to ensure suitable cable glands or conduit
connections are used when wiring to the control unit to maintain enclosure
integrity.
The five cable-entry positions are pre-drilled to accept M20 cable glands.
Model 3493 has a data download socket factory pre-fitted in one of these
cable-entry positions.
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