scope:

Gives symbols on contacts (qualifying symbols: contacts with two or three positions; passing contacts with two positions; early and late operating contacts; examples of contacts with intentional delay; examples of spring return and non-spring return (stay put) contacts), switches, switchgears and starters (single-pole switches; position and limit switches; temperature sensitive switches; speed change sensitive contacts, mercury and levelling switches; examples of multi-pole and multi-position switches; block symbols for complex switches; switchgear and controlgear; block symbols for motor starters), electromechanical all-or-nothing relays (operating devices), measuring relays and related devices (block symbol and qualifying symbols; examples of measuring relays; other devices), proximity and touch-sensitive devices (sensors and detectors; switches), protective devices (fuses and fuse-switches; gaps and arrestors; fire-extinguishers), miscellaneous symbols (igniters and flag-indicators), older symbols for contacts, switchgear and protective devices.