HTA CIS Underground Twisted Pair Cable NFC 33-226

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HTA CIS Underground Twisted Pair Cable NFC 33-226

HTA CIS twisted pair cable for reliable underground transmission.

NFC-compliant cable with UV and moisture-resistant jacket.

Perfect for underground MV control and signaling systems.

Durable twisted pair cable designed for harsh buried conditions.

High-performance HTA CIS cable – stable signal, long service life.

Application

These HTA CIS Underground Twisted Pair NFC 33-226 cables are suitable for medium-voltage public power distribution from 6/10kV to 18/30kV. They are used for power distribution under normal conditions in overhead installations.

The three-phase cables are wound around a messenger consisting of a steel core with a cross-section of 50mm² and an outer insulation with a nominal thickness of 1.2mm. The galvanized steel strands have a minimum breaking load of 64,700N.

Specifications

Category	Technical Description	Typical Applications
Standard	NFC 33-226 – French standard for underground medium-voltage twisted pair cables (CIS: Conducteurs Isolés Souterrains)	Used in MV distribution networks in France and French-speaking countries
Cable Type	HTA CIS – Underground twisted pair of XLPE-insulated, screened conductors	Suitable for 11 kV – 33 kV underground installations
Conductor Material	Stranded copper or aluminum, Class 2 (IEC 60228)	Ensures high conductivity and flexibility
Insulation	High-performance XLPE (Cross-linked Polyethylene) – rated for 90°C continuous operation	Excellent thermal and dielectric behavior
Twisting Configuration	Two single-core insulated cables twisted together (also called “twisted single-core pair”)	Improves electromagnetic balance and eases jointing
Screening	Each core is screened with copper tape or wires, plus semi-conductive layers for field control	Reduces EMF, allows safe grounding, and supports fault detection
Outer Sheath	UV-, water-, and corrosion-resistant HDPE or PVC, depending on installation conditions	Suitable for direct burial in harsh soil environments
Voltage Range	Typically 12/20 kV, 18/30 kV, and 21/35 kV	MV underground distribution, substation links
Fire Performance	Available with flame retardant / LSZH sheath on request	For sensitive urban or tunnel environments
Standards Compliance	– NFC 33-226- IEC 60502-2 (reference)- CENELEC HD 620 (partial alignment)	Ensures compatibility with ERDF/Enedis and French utility networks
Identification	Cores are color-marked or numbered; cable often comes with traceability marking on sheath	Helps in accurate installation & maintenance

Parameter

NFC 33-226 🇫🇷 France, 🇧🇪 Belgium, 🇱🇺 Luxembourg, French-speaking Africa (🇲🇦 🇩🇿 🇹🇳 🇨🇮, etc.) medium voltage, underground HTA twisted-pair insulated cable (HTA CIS) 12/20 kV, 15/25 kV, 18/30 kV

Medium Voltage Overhead Cables
No.of cores and nominal cross section	Phase				Messenger		Approx. overall diameter	Approx weight	Max.DC resistance ofconductor at 20℃
No.of cores and nominal cross section	Min. Number Ofwires	Nominal insulation thickness	Nominal AL/PET tape thickness	Nominal sheath thickness	Conductor	Nominal insulation thickness	Approx. overall diameter	Approx weight	Max.DC resistance ofconductor at 20℃
mm²	No.	mm	mm	mm	No./mm	mm	mm	kg/km	Ω/km
6/10(12)kV
3x1x50+1×50	6	3.4	0.2	2	7/3.0	1.2	49.9	1948	0.641
3x1x70+1×50	12	3.4	0.2	2	7/3.0	1.2	53.6	2239	0.443
3x1x95+1×50	15	3.4	0.2	2	7/3.0	1.2	57.5	2579	0.32
3x1x120+1×50	15	3.4	0.2	2	7/3.0	1.2	60	2859	0.253
3x1x150+1×50	15	3.4	0.2	2	7/3.0	1.2	63.3	3182	0.206
3x1x185+1×50	30	3.4	0.2	2	7/3.0	1.2	67	3599	0.164
3x1x240+1×50	30	3.4	0.2	2	7/3.0	1.2	71.9	4233	0.125
3x1x300+1×50	30	3.4	0.2	2	7/3.0	1.2	76.7	4889	0.1
3x1x400+1×50	53	3.4	0.2	2.2	7/3.0	1.2	83.4	5852	0.0778
3x1x500+1×50	53	3.4	0.2	2.2	7/3.0	1.2	90.9	6991	0.0605
3x1x630+1×50	53	3.4	0.2	2.4	7/3.0	1.2	99.8	8505	0.0469
8.7/16(17.5)kV
3x1x50+1×50	6	4.5	0.2	2	7/3.0	1.2	55.1	2220	0.641
3x1x70+1×50	12	4.5	0.2	2	7/3.0	1.2	58.8	2528	0.443
3x1x95+1×50	15	4.5	0.2	2	7/3.0	1.2	62.6	2888	0.32
3x1x120+1×50	15	4.5	0.2	2	7/3.0	1.2	65.2	3181	0.253
3x1x150+1×50	15	4.5	0.2	2	7/3.0	1.2	68.5	3520	0.206
3x1x185+1×50	30	4.5	0.2	2	7/3.0	1.2	72.1	3956	0.164
3x1x240+1×50	30	4.5	0.2	2.1	7/3.0	1.2	77.5	4648	0.125
3x1x300+1×50	30	4.5	0.2	2.1	7/3.0	1.2	82.3	5329	0.1
3x1x400+1×50	53	4.5	0.2	2.2	7/3.0	1.2	88.6	6292	0.0778
3x1x500+1×50	53	4.5	0.2	2.3	7/3.0	1.2	96.6	7509	0.0605
3x1x630+1×50	53	4.5	0.2	2.4	7/3.0	1.2	105	9027	0.0469
12/20(24)kV
3x1x50+1×50	6	5.5	0.2	2	7/3.0	1.2	59.8	2490	0.641
3x1x70+1×50	12	5.5	0.2	2	7/3.0	1.2	63.5	2816	0.443
3x1x95+1×50	15	5.5	0.2	2	7/3.0	1.2	67.4	3193	0.32
3x1x120+1×50	15	5.5	0.2	2	7/3.0	1.2	70	3499	0.253
3x1x150+1×50	15	5.5	0.2	2	7/3.0	1.2	73.2	3853	0.206
3x1x185+1×50	30	5.5	0.2	2	7/3.0	1.2	76.9	4306	0.164
3x1x240+1×50	30	5.5	0.2	2.1	7/3.0	1.2	82.3	5022	0.125
3x1x300+1×50	30	5.5	0.2	2.2	7/3.0	1.2	87.5	5763	0.1
3x1x400+1×50	53	5.5	0.2	2.3	7/3.0	1.2	93.7	6756	0.0778
3x1x500+1×50	53	5.5	0.2	2.4	7/3.0	1.2	101.7	8014	0.0605
3x1x630+1×50	53	5.5	0.2	2.5	7/3.0	1.2	110.2	9574	0.0469
18/30(36)kV
3x1x50+1×50	6	8	0.2	2	7/3.0	1.2	70.6	3177	0.641
3x1x70+1×50	12	8	0.2	2	7/3.0	1.2	74.3	3540	0.443
3x1x95+1×50	15	8	0.2	2.1	7/3.0	1.2	78.6	3991	0.32
3x1x120+1×50	15	8	0.2	2.1	7/3.0	1.2	81.2	4324	0.253
3x1x150+1×50	15	8	0.2	2.2	7/3.0	1.2	84.9	4748	0.206
3x1x185+1×50	30	8	0.2	2.2	7/3.0	1.2	88.6	5242	0.164
3x1x240+1×50	30	8	0.2	2.3	7/3.0	1.2	94	6018	0.125
3x1x300+1×50	30	8	0.2	2.4	7/3.0	1.2	99.1	6816	0.1
3x1x400+1×50	53	8	0.2	2.5	7/3.0	1.2	105.4	7880	0.0778
3x1x500+1×50	53	8	0.2	2.6	7/3.0	1.2	113.4	9224	0.0605
3x1x630+1×50	53	8	0.2	2.7	7/3.0	1.2	121.8	121.8	0.0469

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