Suspension Clamp

The suspension clamp is primarily used to fix conductors to insulator strings or hang lightning conductors on straightline towers. Moreover, it also can be used for transposition towers to support transposition conductors and for tension towers or angle poles to fix the jumper wires

According to the relative position between the center of gyration axle and the axis of conductor, suspension clamps can be divided into trunnion type, hang-down type and carried-up type.Based on the requirement for grip strength of suspension clamp to conductor, the suspension clamp can be divided into three types: fixed type, slip(releasing) type and limited grip strength type.

Percentage Calculation of Suspension Clamp Grip Strength to the Breaking Strength of Conductors and Ground Wires

Stranded Wire Type	Aluminum-to-Steel Cross-Section Ratio α	Percentage (%)
Steel strand, aluminum-clad steel strand, steel-cored aluminum-clad steel strand	–	14
Aluminum-conductor steel-reinforced (ACSR)	α ≤ 2.3	14
Aluminum-conductor steel-reinforced with alloy aluminum	2.3 < α ≤ 3.9	16
Aluminum – clad steel – cored aluminum strand	3.9 < α ≤ 4.9	18
Heat-resistant aluminum-alloy conductor steel-reinforced	4.9 < α ≤ 6.8	20
Aluminum-clad steel-cored aluminum-alloy strand	6.8 < α ≤ 11.0	22
Aluminum-steel-clad heat-resistant aluminum-alloy strand	α > 11.0	24
Aluminum strand, aluminum-alloy strand, aluminum-alloy-cored aluminum strand	–	24
Copper strand	–	28

Radius Values of the Wire Groove of the Clamp Hull

Wire Groove Radius	4	7	11	14	17	20	23	27	30	35
Maximum Applicable Diameter of Conductors and Ground Wires (Including Wrappings)	7	13	21	27	33	39	45	53	59	69
Minimum Applicable Diameter of Conductors and Ground Wires (Including Wrappings)	4.8	7	13	20	27	32	37	43	48	56

The forged suspension clamp has a smooth and dense surface, reducing corona discharge. The clamp has great anti-corrosion performance and doesn’t require galvanization treatment. The U-bolt adopts high-precision anti-loosening bolts and nuts to prevent slippage between the clamp and the conductor.

Comparison of features
Products	Casting	Forging
Quality of surface	Rough surface	The surface is smooth and dense
Tensile strength	190Mpa	340Mpa
Elongation	2%	12%
Operation and Maintenance	Loose Bolt	Maintenance Free