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Tension Clamp Introduction

Tension clamps are used in transmission and distribution line construction, especially at the section and angle pole. The tension clamp NLD series are made of malleable casting iron conforming with IEC 61284, and all its corrodible parts are galvanized in conformity with BS 729 or equivalent. NLL series of strain clamps for transmission lines comes with insulation covers for extra protection. The dead-end strain clamp is made of aluminum and is preferable for overhead lines up to 11kV and above.

A Strain clamp with an insulation cover is ideal for all types of conductors.

1. Technical specifications

Bolted type strain clamp

Type	Conductor Dia. (mm)	Dimensions(mm)				U Bolt No.	U.T.S (KN)	Weight(Kg)
Type	Conductor Dia. (mm)	D	C	L1	L2	U Bolt No.	U.T.S (KN)	Weight(Kg)
NLL1-1	5.1-11.4	16	19	108	126	2	40	1.7
NLL1-1.7	4.6-13.2	16	14	80	100	2	40	1.3
NLL1-2	8.9-18.5	16	24	187	176	2	40	3.2
NLL1-2C	10.9-15.5	16	28	140	200	2	40	3.2
NLL1-2D	11.7-21.8	16	30	140	200	2	40	3.1
NLL1-2M	6.54-9.27	16	20	127	156	2	40	3.0
NLL1-3	5.1-14.5	16	17	187	203	3	70	5.3
NLL1-3A	11.68-21.84	16	21	128	126	3	70	3.1
NLL1-3N	12.6-23.4	16	22	150	130	3	70	3.2
NLL1-3U	9.5-21	16	25	120	156	3	70	3.8
NLL1-4	9.1-21.8	16	26	275	292	4	90	7.4
NLL1-4A	18.1-24.8	18	30	298	284	4	102	7.4
NLL1-5	24.0-30.0	24	36	446	342	5	120	9.2
NLL1-5A	25.2-36.2	18	32	235	280	5	80	8.3
NLL1-6A	25.0-38.0	18	36	245	300	6	80	9.8

The tension (strain) clamp is bolted type and suitable for use on Aluminium conductor steel reinforced (ACSR), the clamp has cotter bolts, U-bolts, and a pin, the number of bolts is 3, 4, or 5.

The tension clamp has a slip strength of not less than 85% of the rated ultimate strength of the conductor it is intended for use with.

1) The body and the keeper are manufactured from aluminum alloy containing a maximum of 0.4% Cu in accordance with EN 515 and EN 755-2: 2008 such as designation 6061-T6.

The alloy is resistant to inter-crystalline, layer, and stress corrosion. Further properties of the alloy:

a) hardness min 95HBW

b) Resistivity max. 40nΩm at 20℃

c) Proof stress min. 276MPa

d) Tensile strength min. 310MPa

e) A50% elongation at break min. 12%

2) Threaded inserts-to provide sufficient resistance to corrosion threaded inserts are made from stainless steel with a minimum quality equivalent to A2 of EN ISO 2506.

3) Straps are made from hot-dip galvanized steel. The thickness of the zinc coating is at least 80μm and meets the requirements according to ISO 1461

Aluminium tension clamp

Type	Suitable Conductor	Dimensions(mm)							Slip strength (KN)	Weight (Kg)
Type	Suitable Conductor	D	d1	d3	L	L1	R	H	Slip strength (KN)	Weight (Kg)
NY-170	LINNET	32	16	16	430	60	10	240	60.20	2.9
NY-183	LYNX	32	18	18	440	65	11	240	75.71	2.9
NY-240	HAWK	36	18	18	480	65	11	250	82.48	3.2
NY-241	HEN	36	20	20	490	78	12	250	99.44	3.3
NY-248	LARK	36	20	18	490	68	11	250	85.93	3.3
NY-282	DOVE	40	18	20	500	78	12	280	100.64	3.5
NY-264	BEAR	40	22	20	520	78	12	280	105.83	3.6
NY-306	SQUAB	40	18	20	500	78	12	280	102.98	3.5
NY-322	GROSBEAK	40	20	22	540	83	13	280	107.17	3.9
NY-376	TEAL	45	22	22	550	83	13	280	126.75	4.1
NY-402	CONDOR	45	20	22	590	83	13	300	119.29	4.2
NY-428	ZEBRA	48	20	22	600	83	13	300	125.31	4.3
NY-445	REDWING	48	24	24	600	95	15	300	146.32	4.5
NY-468	DRAKE	48	22	22	620	83	13	320	132.52	5.4
NY-494	MALLARD	48	26	24	620	95	15	320	163.00	5.4
NY-483	RAIL	48	18	20	620	78	13	340	109.60	6.4
NY-564	BLUEJAY	52	18	22	620	78	13	340	126.75	6.8
NY-546	CARDINAL	52	20	24	620	95	15	320	143.52	6.8
NY-604	GRACKLE	60	26	24	670	95	15	350	178.93	7.2

The body and jumper clamp is made of aluminum, other parts are made of hot-dip galvanized steel.

2. Fabrication plant

Dead end clamp

3. Packing and storage

The tension clamps are packed in the plywood case and are easy to store.

Bolted type strain clamp

4. Strain clamps application

The tension clamps are used for the tension strings in the transmission and distribution lines.

Aluminium tension clamp

Dead end clamp

Transmission line strain clamps are made of high-strength Aluminium alloy with bolted types and compression types.
1. Dead-end clamp for ACSR conductor (compression type)
2. Aluminum alloy strain clamp (bolted type)
3. Malleable iron strain clamp (bolted type)
4. Straight line type
Tronco Electric provides the design according to the client's specifications and requirements.

Tension clamp catalog.pdf