Smart Cable Cleat Clamps - Calculating Oglaend Smart Cleat Spacings On Cable Ladder Installations

By Chris Dodds on 28th October, 2015

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Theoretical Background
Source: EFI report TR A3901 Jan 1993

Fb=(0.5 x 0.2 x kApeak2)/a where:    

• Fb: Force (N/m)  
• kA.peak: Short circuit current peak value (kA)
• a: Distance between the centre points of the cables/cable diameter
• Cable run. Length of cable run

Recommended distance between Oglaend Smart Cleat clamps mounted on cable ladders

 

The calculated number of clamps is included using SmartSecuringPlate in both ends of the cable run.

The distance between the clamps should be reduced in vertical and horizontal bends. The recommended maximum distance between Smart Cleats is 0.9m.

Recommended distance between Oglaend Smart Cleat clamps when not installed on cable ladder

 

At the start and at the end of the cable run it is recommended to install 3 cleats with 150mm distance between them. The calculation above is including these cable cleats.

The distance between the cleats must be reduced during vertical and horizontal bends. The maximum recommended distance between Smart Cleats is 0.9m.

Smart Securing Plates

Secure plates are strongly recommended to be used at both ends of a trefoil cable run. Realistic tests done on several cable lengths and clamp distances confirms the theory that the cable must be additionally secured at both ends to reduce arching and eliminate deformation and stretch marks on the cable.

Oglaend Smart Securing Plates

Type (State Ladder Width)	Art. No. SS
A-OE EX-Smarcl-150	87544
A-OE EX-Smarcl-300	87545
A-OE EX-Smarcl-450	87546
A-OE EX-Smarcl-600	87547
A-OE EX-Smarcl-750	87548
A-OE EX-Smarcl-900	87549
The Smart Securing Plate is designed to fit all standard ladder types with 300 cc rungs. Includes our RZE and FRP systems.

Distance between Smart Cleats given that the distance between the centre points of the cables or the cable diameter is 42mm

Further Reading:

• Oglaend Smart Cleats - Trefoil & Single Cable Cleats
• IEC Standard 61914 : Cable Cleats & Short-Circuit Calculations For Electrical Engineers

 

 

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Category:  Cable Cleats & Cable Ties

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