Basic Transformer Components
Typical Encapsulated Non-Ventilated Transformer
Case
Encapsulating Mixture
Core
Leads
Coil
Wiring Compartment
Enclosures
Dry-type transformers are enclosed in heavy gauge steel which is degreased, cleaned, phosphatized, primed and finished with ANSI-61 weather -resistant power coat paint. Three types of enclosures are available:
NEMA 1 Ventilated, Indoor Ventilated transformer enclosures are designed to allow air to flow over the core and coil to assist cooling.
NEMA 3R Ventilated, Outdoor?Outdoor weatherproof operation which meets NEMA 3R enclosure requirements is accomplished by the addition of U.L. approved weather shields.
Encapsulated Encapsulated transformers are totally enclosed, non-ventilated and are suitable for indoor or outdoor applications. Construction consists of a core and coil assembly completely encapsulated in a mixture of epoxy resin and sand to provide a rock-hard, durable, air tight, shock-free seal.
Note: All enclosures are provided with wiring components where the transformer leads are brought out for ease of customer cable connections.
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