Interpretations

Answering questions that may arise related to the meaning of portions of an IEEE standard concerning specific applications.

IEEE Standards Interpretation for ANSI C57.12.28™-1999 American National Standard Pad-Mounted Equipment— Enclosure Integrity

Copyright © 2005 by the Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue New York, New York 10016-5997 USA All Rights Reserved.

Interpretations are issued to explain and clarify the intent of a standard and do not constitute an alteration to the original standard. In addition, interpretations are not intended to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standards Department for the appropriate license. Use of the information contained in this document is at your own risk.

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January 2005

Interpretation Request #1
Clause:
5.1.2 Category: Clarify the design of the top of padmount enclosure

As per this standard section 5.1.2, The enclosure shall be designed to shed water and minimize areas where corrosive elements can accumulate."

Does the flat top surface of any padmount encloser serve the purpose of this standard requirement to minimise the corrosive elements accumulation OR does it demands some special design, i.e., raise the center part or cross-kinked top?

Interpretation Response
The scope of paragraph 5.1.2 is very clear. "The enclosure shall be designed to shed water and minimize areas where corrosive elements can accumulate."

THIS INCLUDES THE TOP SURFACE OF BOTH THE TANK AND CABINET...It MUST also meet the corrosion resistance painting requirements (paint tests). How you accomplish this is reflective of YOUR TRANSFORMER DESIGN and is not dictated by STANDARDS. You are free to use what ever method of construction and painting that you choose in order to meet the requirements as set fourth in C57.12.28.