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Trefoil Clamps / Cable Cleats

Trefoil clamps are used for high voltage single core or higher sizes cables where the current rating is high & 3 core cables are not available.

Sumip Trefoil Clamps are used for laying single core cables in Trefoil touching formation which helps to maintain magnetic symmetry thereby avoiding electromagnetic heating and loss of current.

Sumip Trefoil clamps have been molded from virgin glassfiber filled material.

Sumip Type TRE 28 Trefoil clamp has been tested satisfactorily at ERDA to withstand 50 KA short circuit fault current with spacing between Trefoil clamps kept at one meter distance.

    Advantage of Sumip Trefoil Clamps

  • High mechanical strength
  • Center distance between Trefoil clamps can be increased for lower fault level than 50 KA & hence total requirements of clamps can be reduced thereby reduction in cost.
  • Long service life as practically not affected by all chemicals, acids and alkalis.
  • Design of clamp & good flexural strength gives good grip on cable & accommodates slight deviation in diameter of cable.


  • Sumip Trefoil Clamps are supplied with bolts, nuts & washers which are generally MS Zinc passivated but galvanized, SS hardware can be supplied against specific requirement.
  • Flame retardency feature can be provided against specific requirement.
  • Aluminum Trefoil clamps can also be supplied if required.

Current Range of Trefoil Clamps

Model No.MinMaxCC of Mounting Holes in mm
TRE 0316.019.0110
TRE 0420.023.0110
TRE 0523.526.5110
TRE 0634.537.5110
TRE 0830.034.0110
TRE 1038.041.0110
TRE 1442.044.0110
TRE 1644.047.5110
TRE 2147.550.0140
TRE 2450.954.0140
TRE 2854.157.2140
TRE 3057.360.3140
TRE 3560.463.5180
TRE 3763.666.5180
TRE 3967.069.0180
TRE 4369.073.0180
TRE 5076.080.0180

Single Clamp

Sc Series :-
Sizes available from 42mm to 120mm fion cable Diameter

Hardware :-
MS zinc paslivated with optional Hardward available in hot dip galvanized or SS 304 / 316

Model No.Min.Max.
SC 16Ø 42mmØ 46mm
SC 26Ø 52mmØ56mm
SC 33Ø 57mmØ 63mm
SC 40Ø 64mmØ 70mm
SC 46Ø 71mmØ 76mm
SC 55Ø 77mmØ 84mm
SC 75Ø 85mmØ 105mm
SC 82Ø 105mmØ 112mm
SC 90Ø 112mmØ 120mm