NEMA DC 20:1992 (R2009)

NEMA DC 20:1992 (R2009) Residential Controls - Class 2 Transformers Intended primarily for use in 30 volts rms maximum low-voltage control circuits. Includes definitions, electrical ratings, performance, standards, mounting dimensions, and marking requirements.

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Table of Contents

Foreword
Scope
Historyofstandards
1Referencedstandardsanddefinitions
Referencedstandards
Definitions
2Ratingsandclassification
Electricalratings
Classification
3Mounting
General
Plane-surfacemounting
Outlet-boxmounting
4Performanceandtest
General
Regulation
5Marking
General
Additionalmarking

Abstract

Intended primarily for use in 30 volts rms maximum low-voltage control circuits. Includes definitions, electrical ratings, performance, standards, mounting dimensions, and marking requirements.

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