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Data Network Terminal Single-port and Multiport Operating Instructions
34 (128) © Nokia Corporation DN01145897
Nokia Proprietary and Confidential Issue2-0en
WARNING
Note
5.8 Connecting power supply
This section specifies the requirements for the mains power supply of the site.
MAINS VOLTAGE!
Follow the national legislation when working with the power supply.
DNT2Mi must be permanently wired to a disconnect device (for example
circuit breaker) in accordance with the current local and national wiring
standards.
The following warning applies to the AC power supply:
The protective ground wire can only be used for protective conductor
installations. Using the protective ground conductor for other purpose is
dangerous to life. Ensure that the ground connection is established before the
power outlet is connected to the power interface.
The power supply of DNT2Mi can operate at the following voltages:
• 90 to 264 V
AC
(AC-powered unit)
• -20 to -75 V
DC
(DC-powered unit)
• 50 to 150 V (remote-powered via ACL2i).
Power interfaces are located on the rear panel of DNT2Mi.
AC mains is recommended to be protected with a lightning and transient
overvoltage protector (mains wire-in protector). This protection is not included in
DNT2Mi.
In general, mains fuses and supply cables have to be rated according to the
national electric safety regulations.
DNT2Mi can be connected either to a positive-grounded or to a negative-
grounded DC power system. Principles of the DC power systems are presented in
Figures 20 and 21.