The secondary clevis is a kind of spool insulator bracket. It is made from flat steel with a clevis pin that will connect to the spool insulator. The secondary clevis is mainly used on low voltage dead end or corner pole lines or overhead lines, it is also called dead-end clevis or D bracket.
It is applied to connect the spool insulator to the pole so that the spool insulator can support and insulate conductors. There are many different types of the secondary clevis structure. The simplest type is the D bracket which is fabricated for a 16mm diameter through-bolt fixing to the pole and a 16mm diameter insulator bolt. The other complex type of secondary clevis is slotted steel with a mounting hole. The slotted type design is to permit installation without removing insulators.
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