Bl This standard establishes the conditions that must be met by three-pole plugs intended for use in electrical installations, with ground connection and nominal voltage no greater than 250 V between phases and against ground. B-2 This standard does not include tokens intended for use in explosive environments or with corrosive gases or in on-board installations.
IRAM 2147-1959 history
1959IRAM 2147-1959 3 x 220+T type grounded three pole indicator card