August 12, 2019
National Electrical Manufacturers Association (NEMA) published ANSI/NEMA MW
1000-2018 Magnet Wire, which is the premier Standard for general
requirements, product specifications, and test procedures for the manufacture
and packaging of magnet wire. It presents in concise and convenient form all
existing NEMA specifications for magnet wire, including round, rectangular, and
square film insulated and/or fibrous covered copper and aluminum magnet wire
for use in electrical apparatus.
“The magnet wire industry is
pleased to have the new edition of MW 1000 available for use,” says Edgar
Duarte, Magnekón, chair of the NEMA Magnet Wire Section Technical Committee.
“It is especially important for manufacturers that this Standard represents
state-of-the-art magnet wire manufacturing practices and end-use product
This new edition includes
revisions to the dimensional requirements for glass fiber-covered wires, which harmonize
with the IEC mathematical progression approach to calculating dimensional
increases. ANSI/NEMA MW 1000-2018 also adds new specification sheets for glass
fiber-covered, varnish-treated round and rectangular magnet wire. It also
includes new test procedures for determining thermoplastic flow and dielectric
breakdown at the rated temperature of film insulated rectangular magnet wire.
MW 1000-2018 is available in hard copy and as an electronic
download for $278 on the NEMA website.
ANSI/NEMA MW 1000-2018 can also be accessed via www.MW1000.com, which provides steps on how to best use the Standard,
a listing of all amendments that have taken place since 2016, changes under
consideration for the next edition, a historical database of current and
obsolete magnet wire specifications, recorded podcasts on MW 1000-relevant
topics, and links to NEMA Member manufacturers of magnet wire and NEMA staff
working with the magnet wire industry.