As a result, the new edition of EW 4 contains all pertinent graphic symbols recognized by IEC TC 26, the international standards committee for electric welding and allied processes.

The new technical reports (TRs) are ISA-TR5.1.02, Instrumentation and Control Identification System Guidelines and ISA-TR5.1.03, Instrumentation and Control Graphic Symbols Guidelines.

NEMA Publishes Standard for Graphic Symbols for Arc Welding, Cutting Apparatus Mar 11, 2009 The National Electrical Manufacturers Association (NEMA) has published EW 4-2009, the first new edition ...