Spool insulators ANSI 29.3 standard Scope
For spool terminal, porcelain spool insulator is one type of the most widely used products. When producing spool insulators the mainly reference standard is ANSI 29.3.
ANSI 29.3 standard requires that insulator manufacturer should mark the tolerance of spool insulators outline and relative dimensions when they design drawings. And for each of spool insulators should have a logo which can identify insulator manufacturers and the logo should be clear.
When packing spool insulators it should be having corresponding protective measures in order to withstand transport and handling requirements. When leaving the factory, spool insulators should also do the tests of dimension verification, appearance inspection, porosity test and Transverse strength test.
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