The published ceiling
66 kV: what Gala does and does not make
No 66 kV cable termination kit is catalogued anywhere in this range. The heat-shrink termination families run 1.1 kV to 36 kV.
The answer this domain owes the visitor who arrives on it
Four termination families are published — GLT-1100, GXO/E, GXOS/E and GPO/E — and the highest class in any of them is 36 kV. Three tube materials do carry a printed 66 kV figure, and one busbar sleeve genuinely is a 66 kV product. Neither of those makes a 66 kV termination exist, and separating them is the whole job of this page.
A material rating and an assembly rating are not the same claim
A kit rating belongs to an assembly. Breakout, stress control, insulation, sheds and sealing go onto a prepared cable, and that whole arrangement is put through AC, DC and impulse tests and reported against a class.
A material rating is narrower by design. It says a length of tube survived a test as a length of tube — no screen cut-back beneath it, no crutch, no lug, no interface. The published component list rates red insulation tube for the joint area up to 66 kV, and rates non-tracking tube and stress control tube to 66 kV in the same line.
Those figures are the manufacturer's own and they are not in doubt. They attach to the tube, not to what the tube is shrunk over. A 36 kV kit holding a tube qualified at 66 kV is still a 36 kV kit, and no class above 36 kV appears anywhere in the withstand figures published by class.
Every published figure near 66 kV, and what it is a rating on
| Item | Published rating | What the rating is measured on | A 66 kV termination? |
|---|---|---|---|
| GXO/E-3336 | 36 kV | Complete kit, 3-core XLPE or EPR | No — this is the ceiling |
| GPO/E-3336 | 36 kV | Complete kit, PILC | No — this is the ceiling |
| GXOS/E-1236 | up to 36 kV | Complete kit, single-core XLPE, EPR or PVC | No |
| GXO/E-1112 and -1524 | 12 kV and 24 kV | Complete kit, 3-core extruded | No |
| GPO/E-1112 and -1524 | 12 kV and 24 kV | Complete kit, PILC | No |
| GLT-1100 | 1.1 and 3.3 kV | Complete kit, either construction | No |
| Red insulation tube | up to 66 kV | Tube material, joint area | No — a component only |
| Non-tracking tube | up to 66 kV | Tube material | No — a component only |
| Stress control tube | up to 66 kV | Tube material; its own product page prints 36 kV | No — a component only |
| GVOT integrated stress control sleeve | 36 kV on its datasheet, 24 kV on the component list | Sleeve used inside a termination | No |
| GEHB Bustube | 66 kV | Busbar sleeve, not a cable accessory | No |
Component ratings taken from the manufacturer's own Components for Cable Joints & Terminations. Kit codes and classes from the termination range pages.
The 66 kV Bustube insulates a bar, not a cable end
One catalogued item does carry 66 kV honestly: the GEHB Bustube, a heat-shrinkable sleeve that goes over a rigid busbar inside switchgear.
The two parts answer different questions. A sleeve insulates a bare conductor along its length so clearances can be reduced. A termination controls the electric field where a cable's insulation screen is cut back, then rebuilds sealing and creepage over the exposed cores. An enquiry that quotes the Bustube figure against a cable schedule gets answered with the wrong product.
Where the bar really is the subject, that sleeve is covered at the GEHB 66 kV busbar sleeve — a sister reference published by the same people as this site, on the same manufacturer's data, not third-party corroboration.
Why the hardware changes above 36 kV
The ceiling is not an arbitrary place to stop. IEC 60502-4 sets test requirements for accessories on cables rated 6 kV up to 30 kV. Above that boundary the governing document is IEC 60840, covering extruded-insulation power cables and their accessories from above 30 kV up to 150 kV. A 66 kV network sits in that second scope, at a highest voltage for equipment of 72.5 kV.
What changes with the scope is the physical article. At transmission voltages a cable end is normally a sealing end: a housed assembly with a factory-formed stress cone and a defined mating interface, supplied as a controlled item. Field grading moves from a tube applied over a torch on site to a geometry manufactured and measured in advance.
That is a different production capability, not a larger version of the same box. How each catalogued method grades the field is worked through at termination technology choice.
If a requirement above 36 kV is genuine, send these five things
Opening with "do you have 66 kV" earns a one-word reply. Open with the data that decides whether anything can be quoted at all.
- Cable make-up — insulation type, conductor cross-section in mm², core count, and whether the sheath is lead, aluminium or extruded.
- Screen and sheath arrangement — screen construction, whether bonding is solid, single-point or cross-bonded, and what earthing continuity the accessory must carry.
- The interface at the far end — outdoor air, an enclosure, or a plug-in bushing to a named dimensional standard. The interface decides the housing; the voltage only decides the numbers on it.
- Nominal system voltage and the highest voltage for equipment. A requisition written as 66 kV alone is ambiguous against a catalogue indexed by Umax.
- The type-test evidence the utility will accept — standard and edition, issuing laboratory, report number and date.
Not published — ask the manufacturer
Whether anything above 36 kV can be built to order is stated nowhere in the published range. There is no development note, no higher-class enquiry route, and no sentence confirming that 36 kV is a catalogue boundary rather than a capability boundary. No substitute product is nominated for a 66 kV requirement either. Ask in writing and treat an unanswered question as a no, not as a maybe. Independent endorsement stops lower still: the CPRI certificate is written at 33 kV and the MSEDCL approvals reach 33 kV, so even the 36 kV class already sits above every third-party approval on file.
Questions this page exists to answer
Is there a 66 kV heat-shrink termination kit in this range?
The component list prints 66 kV against the tube. Why is the kit still 36 kV?
The stress control tube is published at both 36 kV and 66 kV. Which applies?
Can extra rain sheds lift a 36 kV kit to a higher system voltage?
This site will not present a 36 kV kit as a 66 kV product
The domain carries the number because it is the question readers arrive with, and a plain answer beats a datasheet that stops at 36 kV without saying so. Everything published here is bounded by that ceiling. Where a genuine requirement sits above it, send the cable data and the interface and let the manufacturer reply in writing.