How Do I Splice a Medium Voltage Cable?
Boy, you would really think this was a simple question to answer. It's not. The first problem is that there are a number of different types of 'medium voltage' cable; and each can have different components (and thus different splicing requirements). Let's look through a few of those.
- Cable can be 'jacketed' or 'non-jacketed' (explanation here).
- Cable can be 1/C or 3/C (explanation here).
- Cable can be Armored (or not - explanation here).
- Cable can contain 'concentric neutral cables' or 'copper tape shield' (explanation here).
- Cable can be designed for anything between 5kV and 35kV.
As an example here in this post, I will look at the installation steps for splicing a 1/C, jacketed, concentric neutral cable at 25 kV.
- Make sure the HVS Medium Voltage Splice Kit you've purchased is correctly sized for your cable!
- Remove the cable jacket to the dimensions shown on the installation sheet.
- Fold back the neutral wires on 'side 1' and trim the neutral wires on the other side.
- Use a tie wrap to keep unneeded concentric wires out of the way (to avoid damaging them)
- Abrade insulation (abrading the PE improves the bond of the HVS)
- Place heat shrink tube over cable and then install connector.
- Apply SRM at semi conductor cutback (Stress Relief Material)
- Apply SRM over connector
- Apply Silicone Grease (SG)
- Put black stress control tube in place and shrink with a gas torch.
- Apply red sealant butted up against the black stress control tube on the semi-con.
- Position black/red triple layer tube in place and shrink. Begin shrinking in the middle and move toward one end of tube. Then come back to middle and work toward other end.
- Connect and splice neutral wires and bend them to splice.
- Install shielding mesh by spiral wrapping.
- Position the wrap around shrink sleeve and secure the channel (to hold it in place).
- Shrink the sleeve.
- Congratulations, you've done it!