{"id":12281,"date":"2026-08-29T16:16:53","date_gmt":"2026-08-29T16:16:53","guid":{"rendered":"https:\/\/www.raxpower.com\/?p=12281"},"modified":"2026-08-30T13:21:19","modified_gmt":"2026-08-30T13:21:19","slug":"guide-de-collier-dancrage","status":"publish","type":"post","link":"https:\/\/www.raxpower.com\/fr\/blog\/anchor-clamp-guide\/","title":{"rendered":"Tout savoir sur les brides d'ancrage : ce qu'il faut comprendre"},"content":{"rendered":"

Picture the last pole before the line leaves town. One small fitting at its side carries the pulling force of every meter of cable behind it. That fitting is the anchor clamp, and buyers who treat it as a commodity tend to meet it again during storm season.<\/p>\n

RaxPower has manufactured pole line hardware since 2003, and anchoring fittings sit at the center of that catalog’s tension family. This guide collects what a line designer, contractor, or distributor should know before specifying one: how the wedge grips, which types exist, and which datasheet lines actually decide performance.<\/p>\n

What an Anchor Clamp Does on the Line<\/h2>\n

An anchor clamp is the tension fitting that terminates an overhead cable and hands its full longitudinal pull to the pole, bracket, or tower. Suspension clamps work differently: they only support the cable’s weight and let it slide under load changes. That is why lines run through suspension supports in the middle of a span but always end at anchoring points. On low voltage ABC networks the same part is often sold as a wedge tension clamp or an ABC dead end clamp, rated for 1 kV service. Whatever the label says, the job is identical: hold the cable against full line tension without crushing it.<\/p>\n

For a closer look at the gripping geometry, see the companion explainer on how these clamps grip<\/a> before diving into the full picture below.<\/p>\n

Look at where the hardware sits and its role becomes obvious. Every span ends twice, once at each structure that stops the cable. At those points, one small casting transfers kilonewtons of longitudinal pull into the pole top or bracket. Get the fitting wrong and the cable walks, the sag changes, and phase clearance shrinks with it.<\/p>\n

For buyers, the hardware’s simplicity is the trap. Any machine shop can copy the outline of a wedge housing. Far fewer can hold the taper tolerance and the polymer recipe that make a grip survive a decade of load cycles. The difference shows up in type test reports, not in product photos.<\/p>\n

\"Bolted-type
Three sizes of bolted dead-end tension clamp<\/figcaption><\/figure>\n

How a Wedge Anchor Clamp Grips Cable<\/h2>\n

Inside a wedge clamp, two grooved polymer wedges sit in a tapered aluminum housing. The cable enters between them, and line tension pulls the wedge pair deeper into the taper. Pull harder and the grip tightens, which is why installers need no torque wrench for this family. Like a truck parked on a hill, the cable never stops pulling, so the clamp never stops answering.<\/p>\n

The wedge surfaces carry fine ribs that seat into the cable’s insulation without touching conductors. A steel bail exits the housing and hands the load to the bracket on the pole. Because the wedges float, one housing covers a narrow diameter window rather than a single size.<\/p>\n

Tool-free matters more than it sounds. Crews terminate bundles at height, in weather, often with gloved hands. A wedge housing needs no loop weaving, no bolt torque, and no on-pole measurement. Independent listings of the PA-1500 type describe the wedges as self-adjusting and tool-free, which is why this family spread across LV ABC networks so quickly.<\/p>\n

\"Bolted
A bolted strain clamp ready for bare conductor<\/figcaption><\/figure>\n

Bolted and Preformed Anchor Clamp Options<\/h2>\n

Wedge clamps dominate LV ABC terminations, but they are not the only anchoring hardware. Bolted strain clamps in the NLL style close an aluminum alloy body around bare ACSR or all-aluminum conductors, with galvanized steel U-bolts supplying the pressure. Preformed rod grips wrap helically and spread the load, which suits fiber cables and guy wire dead-ends<\/a>.<\/p>\n

Bolted hardware has its own logic. A trough closed by U-bolts grips by pressure, so the installer controls the bite directly. That makes it the default on bare conductor networks, where splices and equipment jumps need a repeatable, re-torqueable connection.<\/p>\n\n\n\n\n\n\n
Family<\/th>\nGrip method<\/th>\nBest fit<\/th>\nWatch for<\/th>\n<\/tr>\n
Wedge (PA style)<\/td>\nSelf-tightening polymer wedges<\/td>\nLV ABC dead-ends and service spans<\/td>\nDiameter window must match the bundle<\/td>\n<\/tr>\n
Bolted strain (NLL style)<\/td>\nGalvanized U-bolts close an aluminum body<\/td>\nBare ACSR at poles and equipment<\/td>\nTorque per datasheet, mark the nut<\/td>\n<\/tr>\n
Preformed rod grip<\/td>\nHelical rods spread the load<\/td>\nFiber and guy wire dead-ends<\/td>\nRod length must match cable size<\/td>\n<\/tr>\n
Cushioned fiber dead-end<\/td>\nElastomer pads inside a wedge housing<\/td>\nShort ADSS spans<\/td>\nPad condition at every patrol<\/td>\n<\/tr>\n<\/table>\n

A cushioned fiber dead-end deserves special mention. Elastomer inserts reduce compression and bending stress on the cable, protecting the fibers inside a jacket that must never be crushed.<\/p>\n

Four-core bundles bring one sizing detail. Some four-core service clamps take the whole bundle in a single body, while heavier feeders put each core on its own anchoring point. Match the bracket to that arrangement before ordering hardware.<\/p>\n

Where These Clamps Earn Their Keep<\/h2>\n

Walk any overhead distribution route and the anchoring points announce themselves<\/a>. Dead-end poles at the end of a line take the full span pull on every phase. Angle poles take a resultant force whenever the route bends, so each direction change needs its own anchor clamp. Service entrances use smaller wedge units where the bundle drops toward a building.<\/p>\n

Fiber routes add their own cases. Short ADSS spans between poles take cushioned wedge dead-ends, and catalog listings typically cover 8 to 12 mm cable over distances up to about 100 meters. Medium voltage bare conductor lines keep bolted strain clamps on terminations and equipment jumps.<\/p>\n

Voltage class changes the hardware, not the principle. A 1 kV service bundle anchors in polymer-bodied wedges, medium voltage bare lines lean on metal strain clamps, and fiber routes need the cushioned middle ground. Vocabulary shifts between countries, so check the cable construction first and the catalog language second.<\/p>\n

\"Aerial
Anchored bundled cable at a wooden pole<\/figcaption><\/figure>\n

Materials and Corrosion Protection Explained<\/h2>\n

Aluminum alloy shells dominate the wedge family because they are light, dimensionally stable, and galvanically compatible with the aluminum conductors they hold. Polymer wedges and covers use UV-stabilized, fiberglass-reinforced compounds that keep their grip after years in the sun. Steel parts tell a different story: bolts, bails, and brackets rely on hot-dip galvanizing to ISO 1461 for corrosion protection.<\/p>\n

Forging matters as much as coating. Hot-forged blanks keep the metal’s grain flow intact, which is why forged hardware resists cracking under cyclic line tension better than machined bar stock. When you compare quotes, ask what the load path is made of and how the zinc was applied.<\/p>\n

None of these materials excuse a bad finish. Zinc coverage on steel parts should be continuous, because a single pinhole becomes the corrosion path for the whole fitting. Ask whether coating mass is tested against ISO 1461 and whether the certificates travel with the batch.<\/p>\n

Specs and Loads Buyers Should Verify<\/h2>\n

Three datasheet lines decide most purchases. First, confirm the cable diameter window, because a wedge built for a 12 to 14 mm bundle will not hold an 8 mm drop wire. Second, read the minimum breaking load, not just the model number. Third, check the insulation class if the line runs covered cable.<\/p>\n

Model names mislead more than any other trap. One manufacturer’s PA-1500, for example, is listed for 50 to 70 mm\u00b2 single-core 1 kV cable with a 15 kN minimum breaking load. Other catalogs stretch similar model numbers across different sizes and loads from 6 to 20 kN. The number on the housing is not a specification until the datasheet confirms it.<\/p>\n

Insulation class deserves its own minute. Covered cable needs clamps whose polymer parts keep the covering intact at the grip point, while bare conductor lines can spend their budget on the metal. Mixing these up shows up later as tracking marks on the jacket.<\/p>\n

Breaking load is not working load, either. Designs keep a safety factor between the cable’s everyday tension and the clamp’s rated maximum, and each utility defines that margin in its own standards. Quote the expected span tension when you ask for a recommendation; that number makes the datasheet meaningful.<\/p>\n

\n

Typical listing: wedge clamp for 50\u201370 mm\u00b2, 1 kV, MBL 15 kN, aluminum alloy shell, UV-stabilized polymer wedges, self-adjusting, no tool required.<\/p>\n<\/blockquote>\n\n\n\n\n\n
Standard<\/th>\nScope<\/th>\n<\/tr>\n
NF C 33-041<\/td>\nTension fittings for LV ABC accessories<\/td>\n<\/tr>\n
NF C 33-042<\/td>\nService connection anchoring clamps<\/td>\n<\/tr>\n
EN 50483 series<\/td>\nHarmonized European test methods for LV ABC accessories<\/td>\n<\/tr>\n<\/table>\n

European buyers will also see NF C 33-041 and its harmonized EN 50483 equivalents on quotation sheets. Ask suppliers which clauses their type tests cover, and expect a test report with each shipment batch. A supplier that cannot produce the report is selling a model number, not verified performance.<\/p>\n

Sourcing Clamps for Your Network<\/h2>\n

A short supply chain helps here. When the same factory that forges the blank also runs the plating line and assembles the finished clamp, deviations get caught before shipment instead of after installation. In our experience, buyers who audit these process steps once cut their incoming inspection work for years.<\/p>\n

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Need Clamps Sized to Your Cable?<\/h3>\n

The RaxPower range covers wedge, bolted, and preformed tension fittings with datasheets and type test reports for each series.<\/p>\n

View the Anchoring Clamp<\/a>\n<\/div>\n

\"Bolted<\/div>\n<\/div>\n

Volume programs and OEM drawings run through the same channel, from tension and suspension fittings<\/a> to matched brackets for each pole type.<\/p>\n

Installation Checks That Prevent Anchor Failures<\/h2>\n

This is not an installation manual<\/a>, but four checks belong in every crew’s routine. Verify the cable diameter against the clamp window before the bucket leaves the yard. Torque bolted strain clamps to the datasheet value and mark the nut with paint so any movement shows at the next patrol. Treat any clamp that shows slip marks as retired hardware. The wedge has already given up its bite.<\/p>\n

Sequence matters on the pull, too. The winch stays attached until every dead-end is made off, because a released bundle stores enough energy to move on its own. On the crew side, rigging discipline does more for anchor reliability than any catalog choice.<\/p>\n