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Chapter 2. Installation
61202156L2-1 TDU 120e User Manual 2-3
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 conduc-
tors 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 connect-
ed 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.
• A supplementary equipment grounding conductor
shall be installed between the product or system and
ground that is in addition to the equipment ground-
ing conductor in the power supply cord.
• The supplementary equipment grounding conductor
shall not be smaller in size than the ungrounded
branch-circuit supply conductors.
• The supplementary equipment grounding conductor
shall be connected to the product at the terminal pro-
vided and shall be connected to the ground in a man-
ner that will retain the ground connection when the
product is unplugged from the receptacle.