How to Choose the Right 10kV–35kV Cold Shrink Cable Termination: 7 Things to Check

When selecting a medium-voltage cold shrink termination, many people first look at the voltage rating.

But voltage is only the starting point.

If you are purchasing or specifying a 10kV–35kV termination, here are a few practical things worth checking.

1. Check the cable size — but don't stop there.

“95 mm²” or “240 mm²” tells you the conductor size.

It doesn't necessarily tell you whether the termination body will fit.

👉 Always check the diameter over insulation (Dₒ).

This is one of the most important dimensions when selecting a cold shrink termination.

2. Check the actual system voltage.

Don't simply choose a product because it says “35kV”.

Check the cable voltage designation, for example:

6/10kV
8.7/15kV
12/20kV
18/30kV
21/35kV

The accessory should match the actual cable system and applicable requirements.

3. Indoor or outdoor?

The installation environment makes a difference.

For outdoor installations, pay more attention to:

• Creepage distance
• UV resistance
• Moisture
• Pollution
• Weathering performance

A termination suitable for an indoor cabinet isn't automatically the best choice for an outdoor installation.

4. Look at the stress control area.

This is an easy point to overlook.

After the cable screen is removed, the electric field can become concentrated around the screen cut.

The termination needs to control this electrical stress properly.

So don't only look at the appearance or dimensions.

Ask:

👉 How is the stress controlled?

5. Check the cold shrink size range.

Cold shrink products need to maintain sufficient radial pressure after installation.

So check both:

• Minimum applicable diameter
• Maximum applicable diameter

A kit that is technically “for 35kV” may still not be suitable if the cable diameter falls outside its designed range.

6. Check the installation requirements.

Cold shrink doesn't mean “no preparation required”.

Cable preparation is still critical.

Pay attention to:

• Screen cutback length
• Insulation preparation
• Semi-con screen removal
• Grounding
• Installation position

Small mistakes during cable preparation can affect the final result.

7. Finally, check the testing and standards.

Before purchasing, ask what standards and tests apply to the termination.

Depending on the project, this may include:

• AC withstand test
• Partial discharge test
• Impulse test
• Type test requirements

Don't just ask:

“Is this a 35kV termination?”

A better question is:

“What cable construction and test requirements was it designed and qualified for?”

A simple rule I use:

Voltage → Cable size → Insulation diameter → Application → Stress control → Installation → Testing

If you check these seven points before ordering, you can avoid many common selection mistakes.

Sometimes, choosing the right cable accessory is less about finding the “best” product —

and more about finding the right match for the cable and application.

#CableAccessories #MediumVoltage #ColdShrink #PowerCable #ElectricalEngineering