What torque do I use on a mechanical lug?

Use the value marked on the connector or listed on the product page. NEC 110.14(D) requires terminations be tightened to the marked torque with a calibrated tool.

What does AL9CU dual-rated mean?

The lug is listed for both aluminum and copper conductors. Never land aluminum wire on a copper-only lug.

Can I reuse a mechanical lug?

Yes. Mechanical connections can be broken and re-made; inspect the threads and the conductor before re-terminating.

When do I need a two-hole lug?

On busbar and switchgear terminations above 250 kcmil, and wherever fault current could rotate a single-hole lug. Most gear specifies NEMA 1 in or 1-3/4 in hole spacing.

Mechanical Lugs, Dual-Rated AL9CU, 14 AWG to 1000 kcmil, UL 486A/B

Mechanical lugs, 14 AWG to 1000 kcmil, dual-rated

Set-screw lugs that land copper or aluminum without a crimper and come apart for maintenance. Tin-plated 6061 aluminum bodies rated AL9CU, one to four conductors per lug, one-hole and two-hole tongues, stacked and offset designs for tight gutters. All cULus listed to UL 486A/B, 90 C, 600 V. Direct replacements for Burndy KA, Ilsco PB and TA, Panduit CL and the OEM lugs shipped in Square D, Siemens, Eaton and GE gear. Cross-reference your part · Selection guide · Contractor pricing

Pick by conductors and range

Conductors	Range	Stud	Part
1	14 to 6 AWG	1/4 in	CT-T1H1-6A
1	14 to 4 AWG	1/4 in	CT-T1H1-4A
1	14 to 1 AWG	1/4 in	CT-T1H1-1A
1	14 AWG to 1/0	1/4 in	CT-T1H1-1/0A
1	6 AWG to 250 kcmil	5/16 in	CT-T1H1-250
1	6 AWG to 300 kcmil	5/16 or 3/8 in	CT-T1H1-300
1	6 AWG to 350 kcmil	3/8 in	CT-T1H1-350
1	4 AWG to 500 kcmil	3/8 in	CT-T1H1-500
1	2 AWG to 600 kcmil	3/8 in	CT-T1H1-600
1	300 to 800 kcmil	5/8 in	CT-T1H1-800
1	500 to 1000 kcmil	1/2 or 5/8 in	CT-T1H1-1000
2	14 AWG to 1/0	1/4 in	CT-T2H1-1/0A
2	14 AWG to 2/0	1/4 in	CT-T2H1-2/0A
2	6 AWG to 350 kcmil	1/2 in	CT-T2H1-350 · stacked CT-SL21-350
2	2 or 4 AWG to 600 kcmil	1/2 in	CT-T2H1-600 · stacked CT-SL21-600
2	300 to 800 kcmil	1/2 in	CT-T2H1-800 · stacked CT-SL21-800
2	500 to 1000 kcmil	1/2 or 5/8 in	CT-T2H1-1000 · stacked CT-SL21-1000
3	14 AWG to 1/0, 2-hole	1/4 in	CT-T3H2-1/0A
3	2 AWG to 600 kcmil	1/2 in	CT-T3H1-600
4	2 AWG to 600 kcmil, 2-hole stacked	1/2 in	CT-SL42-600
Copper offset	14 AWG to 4/0	#10 to 1/4 in	210-21001 to 210-21006

Torque, UL 486B

14 to 10 AWG 35 lb-in · 8 AWG 40 lb-in · 6 to 4 AWG 45 lb-in · 3 to 1/0 AWG 50 lb-in · 2/0 to 4/0 100 lb-in (3/8 socket) · 250 to 350 kcmil 250 lb-in · 400 to 600 kcmil 275 lb-in · 700 to 1000 kcmil 375 lb-in. NEC 110.14(D) requires a calibrated torque tool. Oxide inhibitor on aluminum conductors.

Equipment that uses these lugs

Load centers: Square D QO/Homeline, Siemens P1/PL, Eaton BR/CH, GE PowerMark, Leviton LP
Safety switches: Square D H/HU, Eaton DH/DG, Siemens HF/GF, GE TH/TG
Panelboards: Square D NQ/NF, Siemens S1, Eaton PRL, GE A-Series
Drives and starters: ABB ACS, Siemens SINAMICS, Eaton PowerXL, Allen-Bradley PowerFlex
Transformers: Square D EX/EE, Eaton V48, GE 9T, Hammond
Transfer switches: Generac, ASCO, Eaton ATC, Kohler RDT/RXT
Solar inverters and combiners: SolarEdge, Enphase, SMA