ANSI Line post insulator 57-21,57-22,57-23,57-24,57-25
Porcelain ANSI line post insulator 57-21,57-22, 57-23, 57-24, 57-25 are manufactured from high strength alumina porcelain. For the top porcelain line post insulator has horizontal clamp used to support and mounting conductor or cable. And for the end fitting it is assembled with stud which fixed on cross arm. Long stud for wooden cross arm and short stud for steel cross arm.
ANSI Line post insulator 57-21, 57-22, 57-23, 57-24, 57-25
The design tests, quality conformance test and routine test for ANSI Line post insulator 57-21, 57-22, 57-23, 57-24, 57-25 are according to ANSI29.7. And the specific test method and sample quantity should reference to ANSI29.1 standard.
All the strength of ANSI Line post insulator 57-21, 57-22, 57-23, 57-24, 57-25 are 12.5kN. Before delivery we will do sample test for every batch of high voltage insulator and ensure our products all are qualified.
Normally, the color of ANSI Line post insulator 57-21, 57-22, 57-23, 57-24, 57-25 is brown and grey. For brown color insulator, it is easy to produce since this color can cover some flaws. But for gray color line post insulator, many manufacturers can not do well surface because gray color is very easy to expose flaws such as rust spot. Bur for our company we can produce perfect gray color insulators and we also can supply more series polymer line post insulator.
If you are interested in our company's other ANSI line post insulator porcelain pin type insulator or disc suspension insulator please reference other pages.