Medium voltage cable terminations come in a few Raychem families, and the first question is always voltage class. This guide sorts TE Connectivity's Raychem HVT, HVT-Z, CST (CSTI and CSTO), CSTOS, TFT-E and TFT-R terminations by voltage so you can see what is available at 5/8, 15, 25/28 and 35 kV, then narrow it by cable size. Sizes below come from TE's data for the US versions.
| Family | Type | Voltage classes | Indoor and outdoor | What TE lists |
|---|---|---|---|---|
| HVT | Heat shrink | 5/8, 15, 25, 35 kV | -G indoor, -SG outdoor | Non-tracking insulating system for shielded plastic cable, including armored cable. IEEE 48 Class I. |
| HVT-Z | Heat shrink | 5/8, 15, 25, 35 kV | -G indoor, -SG outdoor | One-piece co-extruded termination with a zinc oxide stress control layer. IEEE 48 Class I. ShearBolt terminal kits available. |
| CSTI and CSTO | Cold shrink | 5/8 (CSTI only), 15, 28, 35 kV | CSTI indoor, CSTO outdoor | Pre-expanded silicone body on a spiral holdout, for polymeric cable. G kits for tape shield, J kits for JCN. Compliant with IEEE-48 and CENELEC HD 629.1.S2 per TE's CST sheet. |
| CSTOS | Cold shrink | Up to 15 kV | The sheet does not say indoor or outdoor | One-piece Class 1A cold shrink for polymeric cable, one body size, with built-in hi-K stress relief mastic and lug sealing mastic. IEEE-48. G kits for tape shield, J kits for JCN. |
| TFT-E | Cold applied elastomeric | 15, 25, 35 kV | Elastomeric housing with integral sheds | Single core polymeric cable up to 1250 kcmil, with a crush resistant holdout, and the termination can be repositioned after installation. Aluminum ShearBolt kits for 35 kV. Meets IEEE-48 Class 1. Packed 3 kits per box. |
| TFT-R | Cold applied elastomeric | 5/8, 15, 25, 35 kV | -G indoor, -SG outdoor | Separate TE product from the TFT-E. Shielded and non-shielded extruded cable up to 1250 kcmil (non-shielded 5 kV up to 2000 kcmil). Packed 3 kits per box. |
HVT and HVT-Z are rated for the 25 kV class, and the CST is rated for the 28 kV class. TE says the HVT-250 series meets the requirements for 25/28 kV systems.
The 5/8 kV class covers 5 kV and 8 kV cable. Conductor ranges for the HVT and HVT-Z differ slightly between the two voltages, so check yours.
| Family | Kit | Conductor | Insulation diameter (mm) |
|---|---|---|---|
| HVT and HVT-Z | HVT-80, HVT-Z-80-G/SG | 5 kV: #4 to #1 AWG. 8 kV: #6 to #2 AWG. | 9 to 15 |
| HVT and HVT-Z | HVT-81, HVT-Z-81-G/SG | 5 kV: 1/0 AWG to 250 kcmil. 8 kV: #1 to 4/0 AWG. | 15 to 24 |
| HVT and HVT-Z | HVT-82, HVT-Z-82-G/SG | 5 kV: 300 to 500 kcmil. 8 kV: 250 to 500 kcmil. | 20 to 32 |
| HVT and HVT-Z | HVT-83, HVT-Z-83-G/SG | 600 to 1750 kcmil | 28 to 44 |
| HVT and HVT-Z | HVT-84, HVT-Z-84-G/SG | 5 kV: 1500 to 2500 kcmil (HVT-Z to 3500). 8 kV: 2000 to 2500 kcmil (HVT-Z 1500 to 2500). | 41 to 62 |
| TFT-P-R (shielded, indoor, push on) | TFT-P-80R | #6 to #2 AWG | 4.9 to 15.5 |
| TFT-R (5 kV, non-shielded) | TFT-50R | #2 to 3/0 AWG | 13 to 20 |
| TFT-R (5 kV, non-shielded) | TFT-51R | #1 AWG to 350 kcmil | 16 to 28 |
| TFT-R (5 kV, non-shielded) | TFT-52R | 250 to 750 kcmil | 22 to 37 |
| TFT-R (5 kV, non-shielded) | TFT-53R | 500 to 1250 kcmil | 27 to 43 |
| TFT-R (5 kV, non-shielded) | TFT-54R | 1000 to 2000 kcmil | 38 to 56 |
| CSTI (indoor) | CSTI-82G | 2/0 to 350 kcmil | 16.5 to 27 |
| CSTI (indoor) | CSTI-83G | 500 to 750 kcmil | 24.5 to 34.5 |
| CSTI (indoor) | CSTI-84G | 1000 kcmil | 32.5 to 52 |
TFT-E and TFT-R are separate TE products with separate sheets, and both come three kits per box. TE's TFT-E sheet covers 15, 25 and 35 kV only, so use the TFT-R for 5/8 kV. TE's TFT-R sheet also lists 5/8 kV shielded -G kits (TFT-151R-G to 153R-G) under the same part numbers as the 15 kV kits, so confirm with us or TE before ordering a shielded TFT-R for 5 or 8 kV. Insulation diameters for the TFT-R are from TE's sheet in millimeters.
The CSTOS comes in one body size and TE's sheet also lists it for 5 kV 133% and 8 kV 100% cable at 2/0 to 350 kcmil. TE sizes the CST by insulation level as well as conductor. The CST ranges below are for 15 kV 100% cable (175 mil insulation). For 15 kV 133% cable (220 mil), TE lists different conductor ranges, for example #2 to 4/0 AWG in the -2 body size, so check your insulation level.
| Family | Kit | Conductor | Insulation diameter (mm) |
|---|---|---|---|
| HVT | HVT-151 | #4 to 1/0 AWG | 15 to 24 |
| HVT | HVT-152 | 2/0 AWG to 350 kcmil | 20 to 32 |
| HVT | HVT-153 | 400 to 1000 kcmil | 28 to 42 |
| HVT | HVT-154 | 1250 to 2500 kcmil | 41 to 62 |
| HVT-Z | HVT-Z-151-G | #4 to 1/0 AWG | Not listed by TE |
| HVT-Z | HVT-Z-152-G | 2/0 AWG to 350 kcmil | Not listed by TE |
| HVT-Z | HVT-Z-153-G, 153-SG | 400 to 1000 kcmil | Not listed by TE |
| HVT-Z | HVT-Z-154-G | 1250 to 2500 kcmil | Not listed by TE |
| CSTI and CSTO | CSTI-152G, CSTI-152J, CSTO-152G, CSTO-152J | #2 to 250 kcmil | 16.5 to 27 |
| CSTI and CSTO | CSTI-153G, CSTI-153J, CSTO-153G, CSTO-153J | 350 to 500 kcmil | 24.5 to 34.5 |
| CSTI and CSTO | CSTI-154G, CSTO-154G, CSTO-154J | 600 to 1250 kcmil | 32.5 to 52 |
| CSTOS | CSTOS-152G, CSTOS-152J | 15 kV 100%: #2 to 250 kcmil. 15 kV 133%: #2 to 4/0. | 16.5 to 27 |
| TFT-R-G (indoor) | TFT-150R-G | #2 to 3/0 AWG | 13 to 20 |
| TFT-R-G / -SG | TFT-151R-G / TFT-151R-SG | #2 to 250 kcmil | 16 to 28 |
| TFT-R-G / -SG | TFT-152R-G / TFT-152R-SG | 4/0 to 500 kcmil | 22 to 37 |
| TFT-R-G / -SG | TFT-153R-G / TFT-153R-SG | 500 to 750 kcmil | 27 to 43 |
| TFT-R-SG (outdoor) | TFT-154R-SG | 1000 to 1250 kcmil | 38 to 56 |
| TFT-E | TFT-151E / SG / SLC | #2 to 250 kcmil | 16 to 28 |
| TFT-E | TFT-152E / SG / SLC | 4/0 to 500 kcmil | 22 to 37 |
| TFT-E | TFT-153E / SG / SLC | 500 to 750 kcmil | 27 to 43 |
| TFT-E | TFT-154E / SG / SLC | 1000 to 1250 kcmil | 38 to 56 |
TE's HVT-Z sheet gives the 15 kV kits by conductor size and an insulation thickness of 0.175 to 0.220 in. (4.4 to 5.6 mm), but no insulation diameter range, so use the conductor range and measure your cable. HVT-Z kits with a ShearBolt terminal (-T5, -T8, -T9) have their own narrower ranges, covered in the HVT and HVT-Z guide.
| Family | Kit | Conductor | Insulation diameter (mm) |
|---|---|---|---|
| HVT (25 kV) | HVT-252 | #2 AWG to 250 kcmil | 20 to 32 |
| HVT (25 kV) | HVT-253 | 300 to 750 kcmil | 28 to 43 |
| HVT (25 kV) | HVT-254 | 1000 to 1750 kcmil | 41 to 62 |
| HVT (25 kV) | HVT-255 | 2000 to 2500 kcmil | 52 to 76 |
| HVT-Z (25 kV) | HVT-Z-252/352-G, SG | #2 AWG to 250 kcmil | 20 to 32 |
| HVT-Z (25 kV) | HVT-Z-253/353-G, SG | 300 to 750 kcmil | 28 to 44 |
| HVT-Z (25 kV) | HVT-Z-254/354-G, SG | 1000 to 2000 kcmil | 41 to 62 |
| CSTO (28 kV) | CSTO-282G, CSTO-282J | #1 to 3/0 AWG | 16.5 to 27 |
| CSTO (28 kV) | CSTO-283G, 283J | 2/0 AWG to 350 kcmil | 24.5 to 34.5 |
| CSTO (28 kV) | CSTO-284G, 284J | 500 to 1250 kcmil | 32.5 to 52 |
| TFT-R-SG (25 kV, outdoor) | TFT-251R-SG | #1 to 3/0 AWG | 16 to 28 |
| TFT-R-SG (25 kV, outdoor) | TFT-252R-SG | 2/0 to 500 kcmil | 22 to 37 |
| TFT-R-SG (25 kV, outdoor) | TFT-253R-SG | 250 to 750 kcmil | 27 to 43 |
| TFT-R-SG (25 kV, outdoor) | TFT-254R-SG | 750 to 1250 kcmil | 38 to 56 |
| TFT-E | TFT-251E / SG / SLC | #1 to 3/0 AWG | 16 to 28 |
| TFT-E | TFT-252E / SG / SLC | #1 AWG to 500 kcmil | 22 to 37 |
| TFT-E | TFT-253E / SG / SLC | 250 to 750 kcmil | 27 to 46 |
| TFT-E | TFT-254E / SG / SLC | 750 to 1250 kcmil | 38 to 63 |
TE's CST sheet says the -28 body sizes also cover 25 kV 100% cable (260 mil insulation), at the same conductor ranges as 28 kV. TE's TFT-R sheet lists only outdoor -SG kits at 25 and 35 kV, while the TFT-E sheet lists each size with SG and SLC versions without defining the suffixes. The US CST data lists 28 kV kits for outdoor use only. For an indoor 25 or 28 kV termination, look at the HVT or HVT-Z -G kits.
| Family | Kit | Conductor | Insulation diameter (mm) |
|---|---|---|---|
| HVT | HVT-352 | #1 to 1/0 AWG | 20 to 32 |
| HVT | HVT-353 | 2/0 AWG to 500 kcmil | 28 to 47 |
| HVT | HVT-354 | 750 to 1750 kcmil | 41 to 62 |
| HVT | HVT-355 | 2000 to 2500 kcmil | 52 to 76 |
| HVT-Z | HVT-Z-252/352-G | #1 to 1/0 AWG | 20 to 32 |
| HVT-Z | HVT-Z-253/353-G | 2/0 AWG to 500 kcmil | 28 to 44 |
| HVT-Z | HVT-Z-254/354-G | 750 to 1750 kcmil | 41 to 62 |
| CSTI and CSTO | CSTI-352G, CSTO-352G, CSTO-352J | 1/0 to 350 kcmil | 24.3 to 36 |
| CSTI and CSTO | CSTI-353G, CSTO-353G | 250 to 750 kcmil | 32.4 to 48 |
| CSTI and CSTO | CSTI-354G, CSTO-354G | 750 to 2000 kcmil | 43.2 to 64 |
| TFT-R-SG (35 kV, outdoor) | TFT-352R-SG | 1/0 to 250 kcmil | 22 to 37 |
| TFT-R-SG (35 kV, outdoor) | TFT-353R-SG | 4/0 to 500 kcmil | 27 to 43 |
| TFT-R-SG (35 kV, outdoor) | TFT-354R-SG | 500 to 1250 kcmil | 38 to 56 |
| TFT-E | TFT-352E / SG / SLC | 1/0 to 250 kcmil | 22 to 37 |
| TFT-E | TFT-353E / SG / SLC | 4/0 to 500 kcmil | 27 to 43 |
| TFT-E | TFT-354E / SG / SLC | 500 to 1250 kcmil | 38 to 56 |
TE also lists TFT-E kits that include an aluminum ShearBolt connector for 35 kV: TFT-353E-T5 (1/0 to 350 kcmil, 26 to 38 mm insulation, ASBT-2-350), TFT-354E-T8 (350 to 750 kcmil, 35 to 46 mm, ASBT-350-750) and TFT-354E-T9 (600 to 1000 kcmil, 40 to 56 mm, ASBT-600-1000).
| Step | What to decide |
|---|---|
| 1 | Voltage class from the cable rating: 5/8, 15, 25 or 28, or 35 kV. |
| 2 | Shield type. For the CST, G kits are for copper tape shield and J kits are for JCN (jacketed concentric neutral) cable. |
| 3 | Measure the cable insulation diameter and pick the kit whose range covers it. The conductor size alone is not enough, because insulation thickness changes with voltage. |
| 4 | Indoor or outdoor. The -G HVT and HVT-Z kits are indoor with no skirts, and the -SG kits are outdoor with skirts. The CSTI is indoor and the CSTO is outdoor. |
| 5 | Cold shrink or heat shrink. Cold shrink (CST, CSTOS) and cold applied (TFT-E, TFT-R) kits need no torch. Heat shrink (HVT, HVT-Z) needs one. |
| 6 | Connector. Add the lug or pin code to the part number if the kit should ship with one. See the family guides for the connector tables. |
Yes, with the right family. TE lists the TFT-R for both shielded and non-shielded extruded cable, and its non-shielded 5 kV kits run from TFT-50R to TFT-54R. The HVT, HVT-Z and CST tables here are for shielded cable.
The HVT, HVT-Z and TFT-R each list 5/8, 15, 25 and 35 kV. The CST lists 5/8 (CSTI only), 15, 28 and 35 kV.
TE names the HVT class 25 kV and the CST class 28 kV. TE says the HVT-250 series meets the requirements for 25/28 kV systems.
Use the cable's voltage rating and insulation level. If you are unsure, send us the cable nameplate and we will match it.
On the HVT and HVT-Z, -G is the indoor kit with no skirts and -SG is the outdoor kit with skirts. On the CST, G and J refer to the cable shield instead.
No. Each kit is built and tested for its own voltage class, so use the kit for your cable's class.
Every kit ships with TE's instruction sheet. The CST guide also links TE's installation video.
To order a termination kit, contact Powertech Associates at info@powertech-upsc.com or (860) 678-8772 with the voltage class, cable size and shield type. We can cross-reference other manufacturers' part numbers too.
Last updated: November 2026.
