Dead End Clamp vs Suspension Clamp: Which One Goes Where on Overhead Lines

On overhead LV-ABC routes, the most expensive hardware mistake is still simple: hanging a suspension clamp where the span must be anchored. Straight-line poles carry vertical load and a little swing. Terminal poles, angle poles, and section points take full axial tension. Swap the two clamp types and the cable either slips at the dead end or sees a hard grip it was never meant to see mid-span.

This comparison maps where a dead end clamp (tension / anchoring clamp) and a suspension clamp belong on overhead lines, using CONWELL’s published ABC fittings and breaking-load figures.

One-line rule before the BOM

Dead end clamps pull and hold. Suspension clamps hang and support. On CONWELL’s catalog the anchoring devices appear as metal or plastic tension clamps; the hanging devices appear as suspension clamps. Both sit under aerial cable accessories, and neither replaces the other on the pole schedule.

Dead end clamp: terminal, angle, and section poles

A dead end clamp terminates and anchors the conductor so line tension transfers into the pole hardware. CONWELL designs these for LV-ABC and insulated messengers with aluminum-alloy bodies, stainless or Decromet-class hardware, and UV-resistant polymer wedges that grip without cutting the jacket. Category notes list NFC33-042 and EN50483-3 compliance, a typical operating window of −20°C to 90°C, and conductor coverage around 16–150 mm² across the metal tension range. They are single-use: once installed under load, do not plan to reopen and reuse the same clamp.

Concrete shortlist from the metal tension series: PAL1500 covers 35–70 mm² with a 10–13 mm messenger diameter and 15 kN breaking load. Heavier mains move toward PAL2000 on the category table (70–150 mm², 18 kN). Where a polymer body is preferred, PA1500 anchors 50–70 mm² messengers (11.2–12.8 mm) at 6 kN with a self-tightening wedge and open-bail install. Use these at line ends, major direction changes, and section points—anywhere the cable must stop moving axially.

When the drawing calls for a polymer tension body instead of metal, keep PA1500 on the same dead-end poles—do not move it to intermediate hang points just because it installs faster.

Suspension clamp: intermediate straight-line poles

A suspension clamp cradles the cable on intermediate poles. It carries weight, wind, and ice as vertical and limited side load while letting the span keep its designed sag. CONWELL units use corrosion-resistant aluminum alloy with galvanized hardware and UV polymer parts for outdoor ABC support. They are built to hang the line, not to take full terminal tension.

KW95 is a clear mid-span example for single-core LV ABC: 16–95 mm² cross-section and 22 kN breaking load, tool-free mounting to the pole structure. KW94 lists 16–95 mm² with a 15 kN breaking load for the same support role at a lower mechanical class. Put these on straight or light-angle intermediate poles. Do not use them as a cheap substitute at a dead-end or river-crossing terminal.

Where each clamp goes on the route

Field shorthand: count suspension clamps by intermediate poles, count dead end clamps by terminals and hard angles. A ten-span feeder with two terminals needs two anchoring sets plus suspension hardware on the poles between them—not ten anchoring clamps and zero hangers.

Selection checks that keep RFQs clean

Match conductor cross-section and messenger diameter before you argue about brand. PAL1500’s 35–70 mm² / 10–13 mm messenger window is not interchangeable with PA1500’s 50–70 mm² / 11.2–12.8 mm window or KW95’s 16–95 mm² suspension range. Check breaking load against the span design: 15 kN on PAL1500 versus 22 kN on KW95 are different jobs, not a “higher is always better” shopping list. Ask for NFC / EN references already stated on CONWELL dead-end pages (NFC33-042, EN50483-3) when the utility package needs them.

If the same route also needs branch taps, keep insulation piercing connectors as a separate line under aerial cable accessories. Clamps manage mechanics; IPCs manage electrical taps.

FAQ

Can a suspension clamp replace a dead end clamp at a terminal pole?

No. Suspension hardware is not sized to take full axial tension at terminals or major angles. Use a dead end / tension clamp there.

Are CONWELL dead end clamps reusable?

No. CONWELL states they are single-use so clamping force and insulation protection stay consistent after the first install.

Which CONWELL model fits a typical 50 mm² LV-ABC messenger dead end?

Shortlist PAL1500 (35–70 mm², 15 kN) for metal anchoring, or PA1500 (50–70 mm², 6 kN) when a plastic tension clamp matches the design load. Confirm messenger diameter on the drawing before you lock the SKU.

Which suspension clamp should I stock for 16–95 mm² single-core ABC?

KW95 (22 kN) is the higher mechanical class in that window; KW94 (15 kN) covers the same cross-section range at 15 kN. Pick from the span load, not from the product photo.

What standards language should appear on a dead-end datasheet request?

Ask for NFC33-042 and EN50483-3 together with cross-section, messenger diameter, and breaking load for the exact model.

What three fields should every clamp RFQ include?

Pole function (terminal / angle / intermediate), conductor or messenger size, and required breaking load or design tension.

Practical Takeaway

Put dead end clamps where the line must stop; put suspension clamps where the line must hang. For mid-size LV-ABC anchoring, start with PAL1500 or PA1500; for intermediate support on 16–95 mm² single-core ABC, start with KW95. Send CONWELL the pole schedule, messenger size, and breaking-load target—ask for datasheets on those exact models before the first stringing crew mobilizes.