NEMA standard addresses hookup wire
The National Electrical Manufacturers Association (NEMA) published the NEMA HP 6-2007 Electrical and Electronic Silicone and Silicone-Braided Insulated Hook-Up Wire Types s (600 V), ZHS (600 V), SS (1000 V), ZHSS (1000 V) and SSB Braided (1000 V). The NEMA High Performance Wire and Cable Section as a non-government standard for replacement of MIL-W-16878 silicone rubber-insulated wire slash sheets (/7, /8, /29 through /32).
The standard covers requirements for silicone rubber-insulated stranded wire, used in the internal wiring of high-reliability electrical and electronic equipment. It addresses 600 V (types s and ZHS) and 1,000 V 9types SS, ZHSS and SSB) wire. The standard permits continuous conductor temperature ratings of -55 to 150 C with either tin-coated or silver-coated conductors.