ลูกถ้วยหลักรับสายไฟฟ้า : พอร์ซเลน
แบบ 57-4

TIS.2623 Part 7(1)-2564 / ANSI/NEMA C29.7-2015

TYPE / ANSI CLASS 57-4

DIMENSIONS	Leakage distance, minimum, mm 1016 Dry arcing distance, minimum, mm 368
MECHANICAL VALUES	Cantilever strength, kN 12.5 Cantilever proof load, kN 5
ELECTRICAL VALUES	Low-frequency dry flashover, kV 140 Low-frequency wet flashover, kV 110 Critical- impulse flashover, positive, kV 230
RADIO INFLUENCE VOLTAGE DATA	Low-frequency test voltage, rms to ground, kV 44 Maximum RIV at 1000 kHz, microvolts 200
	Colour of insulator BROWN