Historical
NEMA ANSI C37.85:2002
Switchgear - alternating-current high-voltage power vacuum interrupters - safety requirements for x-radiation limits
Specifies the maximum permissible X-radiation emission from ac high-voltage power vacuum interrupters that are intended to be operated at voltages above 1000 V and up to 38,000 V when tested in accordance with procedures described in this standard.
NEMA: National Electrical Manufacturers Association [nema]