Use and Care Guide
3
2.1 INTRODUCTION TO
INSTALLATION
Installing the DLM includes the following procedures:
Mounting the enclosure.•
Connecting line and load power leads.•
Connecting relay control leads.•
2.2 MOUNTING
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Handle DLM carefully when installing. Do not
drop the DLM. Protect the DLM against impact
at all times, and against construction grit and
metal chips. Never install a DLM that has been
damaged.
Install the DLM as close as possible to the electrical loads that are
to be connected to it. The DLM enclosure must be mounted on the
back surface of the enclosure.
Indoor installation• – The enclosure can be mounted in any
orientation that is convenient.
Outdoor installation• – The enclosure must be mounted with the
drain hole on the bottom.
To prevent switch distortion, level all mounting points. To maintain
the type 3R rating a suitable UL listed box connector must be used.
The connector must be UL listed for use in “wet locations”.
Remove screws (2) holding the cover in place.
Mounting slots and holes (4 – 5mm) are provided in the back of
the enclosure. The plastic covering will need to be removed from
the hole before use of the holes and/ or slots. This can be done
with the mounting screw or a screwdriver. Only remove plastic
covering from holes that will be used. See Figure 2.1.
Figure 2.1 — DLM Enclosure and Mounting Dimensions
Mounting Slots & Holes
The DLM enclosure has four (4) ½” knockouts; two (2) on the
bottom and one (1) on each side. The knockouts can be removed
by hitting them with a chisel near the outer edge of the knockout.
Only remove knockouts that will be used. See Figure 2.2.
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All knockout openings in the enclosure must
closed.
Figure 2.2 — Knockouts and Mounting Dimensions
2.3 CONNECTING POWER SOURCE
AND LOAD LINES
Make sure to turn OFF both the UTILITY
(NORMAL) and EMERGENCY (STANDBY)
power supplies before trying to connect power
source and load lines to the transfer switch
and DLM. Supply voltages are extremely high
and dangerous. Contact with such high voltage
power supply lines will result in an extremely
hazardous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are provided in this
manual.
2.3.1 2-POLE MECHANISM
Conductor sizes must be adequate to handle the maximum current
to which they will be subjected to, based on the 75°C column of
tables, charts, etc. used to size conductors. The installation must
comply fully with all applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove any surface
oxides from the cable ends with a wire brush. All power cables
should enter the switch next to transfer mechanism terminals.
Tighten terminal lugs to the torque values as noted on the decal
located on the top of the contactor.
Installation