NECA - NEIS 409
Installing and Maintaining Dry-Type Transformers
|Publication Date:||1 January 2009|
Products and Applications Included
This standard describes the installation and maintenance procedures for single- and three-phase general purpose dry-type distribution and power transformers and associated accessories rated 600 Volts AC or less, and 0.25 kVA or more.
This publication applies to indoor and outdoor, ventilated and non-ventilated, single-phase and threephase transformers used for supplying power, heating, and lighting loads for commercial, institutional, and industrial use in nonhazardous locations both indoors and outdoors.
It also covers periodic routine maintenance and troubleshooting procedures for transformers, and special procedures used after adverse operating conditions such as a short-circuit, ground-fault, or immersion in water.
Products and Applications Excluded
This publication does not cover single- and threephase general purpose dry-type distribution and power transformers and associated accessories rated above 600 Volts AC, or any liquid-filled transformers (see NECA 410).
Regulatory and Other Requirements
All information in this publication is intended to conform to the National Electrical Code® (ANSI/NFPA Standard 70). Installers should always follow the NEC®, applicable state and local codes, and manufacturer's instructions when installing and maintaining dry-type transformers.
Only qualified persons familiar with the construction and operation of dry-type transformers should perform the work described in this publication. The term"qualified person" is defined in Article 100 of the NEC. Administrative functions and tasks such as receiving, handling and storing, required in Section 4 and other tasks can be performed under the supervision of a qualified person.
Other National Electrical Installation Standards provide additional guidance for installing particular types of electrical products and systems. A complete list of NEIS is provided in Annex B.