Who makes what this site specifies

A sizing desk, and the two units behind the parts

Clearance Index publishes millimetres. It makes nothing. The GSC, GMB and GHB sleeve, the GEHB 66 kV sleeve, the BUSBOOT shroud, the BUSCAP end cap, the GMHS and GHHS bus sheet and the GBBS barrier board are all manufactured by Gala Thermo Shrink Pvt. Ltd., a member of the Gala Group trading as Gala Shrink Fit.

The range divides across the two units by process rather than by product family. Heat-shrink tube is extruded at Palghar in Maharashtra, the older site, which also runs moulded shapes, cable accessories and PVC moulding. A second unit inside the Surat SEZ in Gujarat, opened 2011, makes moulded shapes.

That division maps onto this site cleanly enough to be worth knowing. The four sleeve series are extruded tube; BUSBOOT and BUSCAP are mouldings, in PVC or in cross-linked polyolefin. Nothing between compounding and dispatch is bought in, and three laboratories sit on site: partial discharge, high voltage, and general product testing.

This site sizes and specifies; we do not make. Where a figure here needs a document behind it, that document is the manufacturer's — a datasheet, a UL file, a test report — cited on the page that uses it. The ANSI, IEC and ASTM methods behind those figures are decoded once, on the standards page.

From a size code to a purchase order

A code on its own buys nothing. Five facts turn it into a quotable line, and sending them together is what separates a two-email enquiry from a six-email one.

• Bar section in millimetres. Width plus breadth on a rectangular bar, diameter on a round one. A 100 × 10 mm bar sums to 110 mm, and that sum — never the current rating — picks the code out of the size chart.
• System voltage. Wall grade follows from it: GSC to 3.3 kV, GMB to 24 kV, GHB to 36 kV, and GEHB as the separate 66 kV series. The same 110 mm bar carries three different part numbers across the first three grades, so a code quoted without a voltage is ambiguous.
• Run length per phase, and the number of phases. Reel length is a property of the code: 100 m on the smallest thin-wall sizes, 25 m or 20 m through most of the range, 1.5 m on the largest heavy-wall ones. Length converts to reels, not to pieces.
• Geometry at every interruption. Straight and angled bar takes sleeve. A bolted joint, a tee or an elbow takes a moulded shroud; an exposed bar end takes a BUSCAP. Count them first — each is a separate part number.
• Destination and mounting. Indoor or outdoor, and the country of delivery. Sales run through appointed agents, distributors, electric utilities and OEMs into more than 100 countries.
• Anything non-standard, as a dimensioned sketch. Custom shapes, connections and colours are published as available on the shroud and cap sheets. A drawing with numbers beats a paragraph describing the connection.