{"id":12694,"date":"2026-09-09T13:49:08","date_gmt":"2026-09-09T13:49:08","guid":{"rendered":"https:\/\/www.raxpower.com\/?p=12694"},"modified":"2026-09-16T17:26:50","modified_gmt":"2026-09-16T17:26:50","slug":"guia-de-seguranca-tipos-de-instalacao-de-grip-de-ponta-cega","status":"publish","type":"post","link":"https:\/\/www.raxpower.com\/pt\/blog\/dead-end-grip-installation-types-safety-guide\/","title":{"rendered":"Aperto de Extremidade Morta: Guia de Instala\u00e7\u00e3o, Tipos e Seguran\u00e7a"},"content":{"rendered":"

A dead-end grip is the fitting that lets a conductor or a guy strand stop at a pole, a tower, or an anchor without a bolt squeezing the cable. Instead of a wedge or a compression sleeve, it uses a set of preformed helical wires that wrap onto the cable and share the load along their whole length. The result is a termination that holds tension while leaving the conductor strands untouched.<\/p>\n

RaxPower supplies dead-end grips within a formed-wire program that also covers armor rods and guy grips, so the grip, armor rods, and thimble are one matched set. The notes below come from how those parts are built and installed, not from a catalog summary.<\/p>\n

What a Dead End Grip Does on the Line<\/h2>\n

A dead-end grip is a preformed helical fitting designed to securely terminate, anchor, or tension stranded cables without damaging the conductor. It belongs to the formed-wire family of overhead line hardware and replaces bolted or compressed dead-end fittings where the cable must stay intact.<\/p>\n

The name covers several jobs. A conductor dead-end terminates ACSR, AAC, AAAC, and similar stranded conductors at a structure. A dead-end guy grip anchors 7-wire guy strand to an earth anchor. ADSS and OPGW grips terminate all-dielectric and optical ground wires, usually with armor rods built in. Each version wraps the same way but is matched to a specific cable diameter and rated breaking strength.<\/p>\n

The grip is the visible end of a load path. Tension runs from the conductor, into the helical wires, through a thimble, and on to yoke plate, dead-end clevis, or anchor hardware. Get the grip right and the whole chain stays continuous; skip the detail and the weak point moves to the cable itself.<\/p>\n

How the Helical Wrap Holds Tension<\/h2>\n

Unlike traditional mechanical clamps, a preformed dead end grip works through helical friction and radial compression. The spiral legs are pre-shaped to the cable lay, so when they are wrapped on, the fit is exact from the first turn.<\/p>\n

\n\"Preformed
Preformed helical rods seated on a line conductor<\/figcaption><\/figure>\n

Four things happen as the grip takes load. The spiral legs match the cable lay and seat naturally. Radial pressure spreads evenly instead of biting at one point. Friction between the wires and the cable stops slip. The tensile load transfers gradually across the whole grip rather than at a single concentrated spot.<\/p>\n

That spread is the point. Concentrated compression from a bolted clamp can distort strands and start birdcaging; a helical grip lowers local stress, so the cable fatigues slower and survives vibration better.<\/p>\n

Dead End Grip Types by Application<\/h2>\n

Selecting a grip starts with what it clamps. The table groups the common versions by cable and duty.<\/p>\n\n\n\n\n\n\n
Type<\/th>\nClamps<\/th>\nTypical use<\/th>\n<\/tr>\n
Conductor dead-end<\/td>\nACSR, AAC, AAAC, AWAC<\/td>\nPhase and neutral termination at dead-end structures<\/td>\n<\/tr>\n
Dead-end guy grip<\/td>\n7-wire galvanized guy strand<\/td>\nAnchoring down-guys and pole stays to earth anchors<\/td>\n<\/tr>\n
ADSS \/ OPGW grip<\/td>\nAll-dielectric and optical ground wire<\/td>\nFiber termination with build-in armor rods<\/td>\n<\/tr>\n
Messenger \/ service grip<\/td>\nMessenger wire, service drop<\/td>\nShorter spans and light-duty terminations<\/td>\n<\/tr>\n<\/table>\n
\n\"Preformed
Preformed dead end grip, formed-wire product<\/figcaption><\/figure>\n

For heavy conductors, the Big Grip style adds legs and grip length to reach higher holding values. A formed-wire dead-end grip<\/a> is always ordered against the conductor code, not a generic size, because the wire diameter and lay decide the fit.<\/p>\n

Materials and Coatings That Decide Service Life<\/h2>\n

The grip is only as durable as its wires. Two materials cover nearly every line. Galvanized steel wire suits steel-reinforced conductors and guy strand, while aluminum-clad steel wire is chosen for aluminum conductors and corrosion-sensitive routes.<\/p>\n

\n\"Preformed
Related preformed tension hardware in the formed-wire range<\/figcaption><\/figure>\n

The base wires follow recognized specs. Galvanized steel wire strand is covered by ASTM A475, which defines grades and zinc coatings for guys and messengers. Aluminum-clad steel wire tracks ASTM B415. After forming, the wires are hot-dip galvanized to ASTM A123 or ISO 1461, so the coating wraps the legs and the ends alike.<\/p>\n

Coating choice tracks the environment. Coastal and industrial sites call for heavier zinc classes, because the exposed end sees the same weather as the rest of the line. A sound coating is what lets a grip outlast the structure it serves.<\/p>\n

Step-by-Step Dead End Grip Installation<\/h2>\n

Most preformed dead-end grips install by hand and need no special tools. The discipline is in the sequence, not the equipment.<\/p>\n

\n\"Lineman
Field termination work on a distribution pole<\/figcaption><\/figure>\n
    \n
  1. Match the grip to the conductor diameter and the factory color code before the bag is opened.<\/li>\n
  2. Lay the armor rods on first for conductor and ADSS grips, so the cable surface is protected.<\/li>\n
  3. Seat the thimble into the grip bend; the thimble sets the termination radius.<\/li>\n
  4. Wrap the short leg first, then the long leg, following the conductor lay direction.<\/li>\n
  5. Continue wrapping by hand until the grip is fully seated, keeping the spacing uniform.<\/li>\n
  6. Connect the thimble to the yoke plate, clevis, or anchor hardware and tighten to spec.<\/li>\n
  7. Inspect visually: no gaps, no crossed legs, correct lay, and the color codes aligned.<\/li>\n<\/ol>\n

    The wrap is built for one installation. Re-wrapping loosens the set lay, so a grip that has been fitted and removed should not be reused on a live span.<\/p>\n

    Hardware the Grip Connects To<\/h2>\n

    The grip never works alone. Its thimble drops into a yoke plate or dead-end clevis, which then links to a socket, turnbuckle<\/a>, or guy hook. For a down-guy, that chain ends at an earth anchor<\/a> set in stable soil.<\/p>\n

    Compatibility matters at every joint. The thimble radius, the clevis pin, and the anchor rating must all sit inside the grip's load path. A mismatch lets one undersized link decide the failure, even when the grip itself is rated higher than the cable.<\/p>\n

    For suspension-to-tension transitions, the same formed-wire bench that builds the grip also builds the tension and suspension fittings<\/a> the line needs, which keeps the hardware family consistent.<\/p>\n

    Dead End Grip Safety Linemen Must Control<\/h2>\n

    Safety on a dead-end grip is a list of controls, not a single check. The line carries full tension the moment the grip seats, so the details below are what keep a termination honest.<\/p>\n