User manual

Chapter 2. Installation
2-2 TDU 120e User Manual 61202156L1-1
Power Connection
AC powered units: Each TDU 120e AC is equipped with a
captive eight-foot power cord, terminated by a three-prong
plug which connects to a grounded power receptacle.
DC powered units: Each TDU 120e DC unit is provided with
a two-pin power receptacle and mating plug. Power to the
TDU 120e DC is +
48 VDC or +24 VDC.
GROUNDING INSTRUCTIONS
Grounding instructions from the Underwriters' Laboratory UL
1950 3rd Edition are provided in this section.
An equipment grounding conductor that is not smaller in
size than the ungrounded branch-circuit supply conductors
is to be installed as part of the circuit that supplies the
product or system.
• Bare, covered, or insulated grounding conductors are
acceptable.
• Individually covered or insulated equipment grounding
conductors shall have a continuous outer finish that is
either green, or green with one or more yellow stripes.
• The equipment grounding conductor is to be connected
to ground at the service equipment.
• The attachment-plug receptacles in the vicinity of the
product or system are all to be of a grounding type.
• The equipment grounding conductors serving these
receptacles are to be connected to earth ground at the
service equipment.
Power to the TDU 120e AC must be from a grounded 90-120
VAC, 50/60Hz source.