NEMA Surge Protection Institute: NEMA LS 1

Regulatory, Safety, & Standards

NEMA Surge Protection Institute

NEMA LS 1: Low Voltage Surge Protective Devices

Addressing guidelines to describe and compare low voltage SPDs.

In 2000, NEMA reaffirmed its 1992 standard LS 1, "Low Voltage Surge Protection Devices." This document provides manufacturers and specifiers with guidelines to describe and compare low-voltage (less than 1000V RMS) Surge Protection Devices (SPDs) using a uniform terminology and format.

At a Glance:

Covers: specifications, definitions, selection & application criteria, test & evaluation procedures
Pages: 7
Price: $26 USD
For: end-users (consumers), manufacturers, & specifiers
Next revision: December 2005
How to buy

The document outlines SPD parameters considered essential and measurable, using off-the-shelf testing equipment and referencing established standards defined by ANSI/IEEE and UL.

The document consists of three sections:

Specifications, Introductions and Definitions
Selection and Application Criteria
Test and Evaluation Procedures

LS1 provides guidelines only. It does not introduce new standards or test methodology, nor does it define extensive vocabulary for SPDs. IEEE C62.41, C62.41.2, C62.45 and UL 1449 2nd Edition can be reviewed for a comprehensive understanding of the surge environment, waveforms and testing.

How to Buy NEMA LS 1:

NEMA standards can be obtained from Global Engineering and additional information, including the table of contents, technical contacts, and more, at NEMA's website.

The document is approximately 7 pages and is available for $26.00. The next revision is scheduled for December 2005.

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