zhou, Author at cnconwell

Most termination overheating tickets start with a metal mismatch, not a bad crimp die. A copper lug on an aluminum feeder looks fine on day one, then galvanic corrosion and rising resistance show up after a few wet seasons. The reverse mistake—buying only aluminum stock when every panel pad is copper—creates the same failure path. Power termination needs the lug metal to follow the cable metal, with a bimetal transition when the two disagree.

This comparison maps CONWELL copper cable lugs, aluminum cable lugs, and bimetal cable lugs for LV/MV power terminations so the RFQ names the right family before anyone orders dies.

One selection rule before the catalog

Match the lug to the conductor first. Copper cable → copper lug. Aluminum cable → aluminum lug. Aluminum cable onto a copper terminal or busbar → bimetal lug. CONWELL’s own cable-lug guidance states that direct copper-to-aluminum joints invite galvanic corrosion, loose contact, and overheating—use a copper-aluminum transition instead of forcing a single-metal lug across dissimilar metals.

Copper vs aluminum vs bimetal at a glance

Check point	Copper lugs	Aluminum lugs	Bimetal lugs
Primary use	Copper cable to copper terminal	Aluminum cable to aluminum / Al-compatible terminal	Aluminum cable to copper terminal / busbar
CONWELL material notes	Electrolytic copper; bare or tin-plated	EC-grade Al 1350 (Al ≥99.5%); optional 6061/6082 alloys	Copper palm + aluminum barrel, friction welded or precision bonded
Conductivity / weight	Highest conductivity; heavier	≥61% IACS on published Al line; lighter, lower material cost	Copper contact face + lighter Al cable side
Published range examples	GTY tubular sizes from about 1.5 to 630 mm² class	Category coverage 16–1000 mm²; DL table DL-16 to DL-500	DTL / DLT families; category notes about 10–630 mm²
Standards language on site	IEC / ISO 9001	IEC 61238-1, IEC 61439, ISO 9001, RoHS	IEC / ISO 9001; friction-weld preference on selection notes
Watch-outs	Cost; do not put on Al cable	Clean oxide before crimp; do not land on copper pads bare	Install orientation—Al barrel on Al cable, Cu palm on Cu stud

Copper cable lugs: when conductivity and Cu systems lead

CONWELL copper lugs are built from high-purity electrolytic copper for power cable connectors, with tin plating offered for outdoor, humid, and coastal work. Category applications cover LV/MV distribution panels, switchgear, transformers, generators, renewables, and grounding. Series names on the copper range include DT, DTS, SC, GTY, GT, CCT, and TJ.

GTY is a clear tinned-copper tubular example: published barrel dimensions run from GTY1.5 through GTY630 (for example GTY95 lists d1 14.2 mm / D 17.4 mm / L 47 mm; GTY240 lists d1 21.4 mm / D 26 mm / L 75 mm). Crimp or solder termination sits on a round, double-thick tongue for cabinet and equipment wiring. Choose copper when the feeder is copper and the pad is copper—especially continuous-duty industrial and grounding work where contact resistance budget is tight.

Aluminum cable lugs: when the feeder is aluminum

CONWELL aluminum lugs target aluminum conductor terminations on distribution, overhead, transformer, and industrial jobs. Published material data lists EC-grade aluminum 1350, conductivity ≥61% IACS, bare / tin-plated / nickel-plated options, LV & MV use up to 35 kV, and cross-sections from 16 mm² to 1000 mm² under IEC 61238-1 language. Series labels include DL, DLS, GL, and GLM.

The DL dimensional table on CONWELL’s aluminum lug pages covers DL-16 through DL-500 (for example DL-95: Dia 12.5 / D 21 / d 13 / L 112 mm; DL-240: Dia 16.5 / D 30 / d 20 / L 140 mm). Pick aluminum when both cable and landing point stay in the aluminum system, or when weight and cost on long aluminum runs matter more than a full-copper BOM. Clean oxide from strands and the barrel before crimping—aluminum’s surface film is part of every install note on the aluminum category FAQ.

Bimetal cable lugs: the Cu–Al transition default

Bimetal lugs exist for one job: aluminum cable to copper terminals. CONWELL builds them with a copper section for the stud or busbar and an aluminum section for the cable barrel, joined by friction welding or precision bonding, with optional tin plating for outdoor and coastal sites. Category applications include distribution panels, overhead terminations, transformer inlets/outlets, grounding, and mixed-metal industrial wiring. Working temperature on the bimetal FAQ is listed from −40°C to +90°C for normal service.

Concrete series on the site include DTL-1 (example DTL-1-16 with φ8.5 mm hole callout), DLT, DTL-2, DTL-2-F, DTL-S, and GTL. Category selection notes prefer friction-welded construction and cover roughly 10 mm² to 630 mm² across the bimetal range. If the drawing shows Al cable and Cu equipment pads, shortlist DTL/DLT before debating price between copper and aluminum single-metal lugs.

Buyer decision path

Write the material pair on the RFQ first: Cu–Cu, Al–Al, or Al–Cu. Then lock cable mm² and bolt hole (M6/M8/M10/M12 and similar). Then pick finish—tin plate for humid or outdoor landings. Mechanical shear-bolt lugs under mechanical cable lugs are a separate install method when the site has no hydraulic crimp tooling; they do not erase the copper / aluminum / bimetal material rule.

FAQ

Can I use an aluminum lug on a copper cable?

No. Keep copper lugs on copper cables. Mixing metals at the barrel creates the same galvanic risk the bimetal range was built to avoid.

Can I use a copper lug on an aluminum cable landed on a copper busbar?

Do not treat a copper lug as a safe Al-to-Cu transition. Use a bimetal lug with the aluminum barrel on the Al cable and the copper palm on the Cu stud.

When should I choose tin-plated copper instead of bare copper?

Use tin-plated copper for outdoor, humid, coastal, or underground landings where CONWELL calls out oxidation resistance. Bare copper suits dry indoor panels when the specification allows it.

What size range should I expect on CONWELL aluminum lugs?

The aluminum category lists 16 mm² to 1000 mm². The DL table published on product pages runs DL-16 through DL-500—confirm the exact SKU against your cable mm² and bolt hole.

What causes bimetal lugs to overheat in service?

CONWELL’s bimetal FAQ points to wrong model selection, poor crimping, reversed installation, loose bolts, or overload. Check orientation and crimp quality before blaming the friction weld.

What three fields should every lug RFQ include?

Cable metal and mm², terminal metal and bolt size, and required lug family (copper / aluminum / bimetal) plus finish.

Practical Takeaway

Select lug metal from the cable-to-terminal pair, not from unit price. Use copper lugs (for example GTY) for Cu–Cu, aluminum lugs for Al–Al, and DTL / DLT bimetal whenever aluminum cable meets a copper pad. Send CONWELL cable metal, mm², bolt hole, and environment—ask for datasheets on those exact series before the first crimp.