Larson Electronics MPD-DS-WML-NFDS Series User manual

MPD-DS-WML-NFDS Series
Non-Fused Manual AC Disconnect Safety Switch
Instruction Manual
Instruction Manual
Thank you for your purchase of the Larson Electronics MPD-DS-WML-NFDS Series disconnect switch.
WARNING:
READ CAREFULLY BEFORE INSTALLING FIXTURE. RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE.
CRITICAL SAFETY INSTRUCTIONS:
•INSTALLATION SHOULD ONLY BECONDUCTED BY A QUALIFIED ELECTRICIAN IN ACCORDANCE WITH NEC AND ANY
RELEVANT LOCAL BUILDING CODES.
•RISK OFFIRE OR ELECTRIC SHOCK. FIXTURE INSTALLATION REQUIRES KNOWLEDGE OF FIXTURE'S ELECTRICAL
SYSTEMS. IFNOTQUALIFIED, CONTACT A QUALIFIED ELECTRICIAN.
•BE CERTAIN ELECTRICAL POWER IS OFF BEFORE AND DURING INSTALLATION AND MAINTENANCE.
•MAKE SURE THE SUPPLY VOLTAGE IS THE SAME AS THE FIXTURE'S RATED VOLTAGE.
•TO PREVENT WIRING DAMAGE OR ABRASION, DO NOT EXPOSE WIRING TO EDGES OF SHEET METAL OR SHARP
OBJECTS. SUITABLE FOR DAMP LOCATIONS.
The Larson Electronics MPD-DS-WML-NFDS Series Power Distribution Non Fused Disconnect Switch is designed for
reliable, safe and convenient power distribution at industrial work sites. Designed for wall mounting installations, the
disconnect switch is protected by a NEMA 3R rated steel enclosure.
Mounting Holes
MOUNTING
The Larson Electronics MPD-DS-WML-NFDS Series Power Distribution Non Fused Disconnect
Switch is designed for wall mounting applications. There are flanges at top and bottom on the
back of the enclosure, allowing the switch to be mounted to any flat surface that is capable of
supporting the load. Simply choose a sturdy location, and secure the unit to the wall using
appropriately sized hardware for the pre-drilled mounting holes on the flanges of the enclosure.
Always follow all applicable local and national electrical and building codes when
installing this unit.
Note: Consider your plans for bringing in supply power
and running secondary power when mounting, and be
sure to leave clearance for all necessary wiring and
operations, as well as for opening the door.
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Wiring
Only a licensed electrician should install this product, in all locations, especially in outdoor areas where
weatherproofing may be required.
Note: Always check product nameplate or labeling for voltage ratings! Follow all applicable local and National
Electrical and building code when installing.
There are two types of installation methods: Conduit installation or cable installation. If the enclosure is complete with
factory installed entry hardware, run all your wiring through entry hardware and refer to the wiring diagram included with
your unit for completing wiring connections.
If the enclosure does not include entry hardware, select the appropriate hubs or cable connectors and install them per the
IOM included with the hardware.
Installation of approved conduit hubs or cable connectors
CAUTION: FIELD INSTALLED OPENINGS:
For field-installed openings, use a hole saw, metal drill bit, or pneumatic type punch to create an appropriately sized hole
for mounting your selected hardware. Always wear safety glasses and protective clothing when working.

MPD-DS-WML-NFDS Series
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Conduit/Cable Installation
In situations where the metal cable connector and conduit hubs must be bonded to the ground system, this can be
accomplished by installing them either by method 1 or method 2 as shown.
Method 1: Enclosures with flange plates using threaded
openings through the flange plate and standard
locknuts. Flange Plate must be connected to the
internal grounding system using jumper wires.
Refer to IOM sheet of cable connector for proper installation
Method 2: Enclosures without flange plates using a hole
“through the enclosure” with grounding
locknut.
These locknuts must be bonded between each other and to the
grounding system using jumper wires. After the entry hardware is
installed, connect the appropriate conduit or cable.
Note: All unused enclosure openings must be closed using
approved close-up plugs with standard locknuts.
IMPORTANT: When connecting conductors:
•Strip the wire so that the insulation covers the wire up to the
terminal.
•Make sure all wires are connected to the correct terminals,
per the wiring diagram.
•Tighten all terminal blocks/screws.
THESE INSTRUCTIONS MAY NOT COVER ALL DETAILS OR VARIATIONS OF THIS PRODUCT FOR YOUR EQUIPMENT OR INSTALLATION REQUIREMENTS.
SHOULD FURTHER INFORMATION NOT COVERED BY THESE INSTRUCTIONS BE REQUIRED, PLEASE CONTACT LARSON ELECTRONICS BY EMAIL AT
SAL[email protected] OR BY PHONE AT 1-877-348-9680 FOR FURTHER ASSISTANCE.
PLEASE VISIT LARSONELECTRONICS.COM FOR WARRANTY AND RETURN INFORMATION.
OPERATION
MPD-DS-WML-NFDS Series switches operate with an exterior switch, allowing the unit to be cycled off and on without
the need to open it. Two-position OFF-ON and three-position ON-OFF-ON are the most common setups, and switches
are typically labeled to show the current position.
REPLACEMENT PARTS
The MPD-DS-WML-NFDS is designed to provide years of reliable performance. Should the need for replacement
parts arise, please contact Larson Electronics.