LARSON MT-BBT-480Y-380Y.220-3P-781A, Manual

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Larson Electronics, LLC Phone: (800) 369-6671 Fax: (903) 498-3364 www.larsonelectronics.com 1 of 7
DIAGRAM L
BUCK & BOOST TRANSFORMERS
THREE-PHASE BUCK & BOOST TRANSFORMERS
INSTRUCTION MANUAL
This manual applies to all three-phase buck & boost transformers sold by Larson Electronics. Please refer to
the connection diagram on pages 4-6 for properly connecting the transformer.
Warning: Do not attempt installation until you are familiar with all warnings, precautions, and procedures
outlined within this instruction sheet. We strongly encourage only a licensed electrician install, operate and
maintain this product.
Precautions:
•
Do not handle this transformer without proper equipment and experienced personnel.
•
Fully inspect the transformer before installation.
•
Use appropriate electrical terminals with flexible connectors.
•
Connections should be in accordance with nameplate drawings or attached wiring diagrams.
•
Disconnect all live power before installing and maintaining the transformer.
•
Do not change any connections while the transformer is energized.
•
Secure all ground connections before energizing the transformer.
After receiving the transformer, immediately inspect each unit for damage that could have resulted from transit.
Check to ensure the specs on the transformer match the shipping documents. A claim should be filed with the
carrier if any shipping damage is noted. These details with all relevant information should also be forwarded to
Larson Electronics.
Use appropriate measures and experienced personnel for transporting the transformer relative to its size.
Never attempt to lift the transformer without proper equipment. Lifting tabs are included on larger transformers
to help ease transportation.
All MT-BBT Buck-Boost transformers are NEMA 3R rated, suitable for both indoor and outdoor installations.
Follow appropriate electrical codes for cable installation and use suitable hardware for outdoor installations,
such as water tight couplings at each knockout.
The transformer must be installed in an upright position on surfaces capable of supporting its weight. If
installed outdoors, orient the unit vertically with the wiring compartment down to prevent the ingress of
moisture.
Mounting the Transformer (refer to page 7)
1. Choose a non-combustible surface for installing the transformer. This location must allow air flow
around the transformer for cooling purposes.
2. Pre-drill the top two mounting holes on your mounting surface. (refer to mounting table on page 7)
3. With assistance, lift the transformer over the pre-drilled mounting holes and install the top two mounting
bolts. Use appropriate equipment and lifting tabs for large transformers.
4. Level the unit and find the lower mounting hole(s) within the wiring compartment.
5. Drill out and install the lower mounting bolt(s) into the mounting surface.
6. In order to provide NEMA 3R protection, the unit must be mounted vertically with the mounting tabs
facing up.