TIS 166-2549 Figure A.1 Gauge for checking impossibility of single-pole insertion of plugs

TIS 166-2549 Figure A.1 Gauge for checking impossibility of single-pole insertion of plugs

TIS 166-2549
Thai Industrial Standard for PLUGS AND SOCKET-OUTLETS FOR HOUSEHOLD AND SIMILAR
PURPOSES : PLUGS AND SOCKET-OUTLETS WITH RATED VOLTAGE NOT EXCEEDING 250 V