Low-voltage KUSIL cable (TU 3500-013-76960731-2008)

power, control, signaling, lighting

Compliance with Standards:
- GOST 31996-2012 “Power cables with plastic insulation for a rated voltage of 0.66; 1 and 3 kV. General technical requirements”,
- International standard for power cables IEC 60502-1:2004 “Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) – Part 1: Cables for rated voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV)”,
- GOST R 58342-2019 “Power and control cables for use in electrical installations in explosive environments. General technical requirements”. The standard was developed by JSC “VNIICKP” and approved by the Technical Committee for Standardization “Equipment for explosive environments (Ex-equipment)” TC 403, and came into effect in 2019.
Power cable brand
KUSIL ng(A)-HF 5×2.5ok(N,PE) PE-0.66

Application area

Cables are designed for the transmission and distribution of electrical energy in stationary installations with a rated AC voltage of 0.66, 1, and 3 kV at a nominal frequency of 50 Hz. They are intended for use in power circuits, control circuits, signaling, and lighting systems. The cables are suitable for operation in AC electrical networks with either a grounded or isolated neutral, where the duration of single-phase ground faults does not exceed 8 hours, and the total duration of operation in this mode does not exceed 125 hours per year.
Cables can be installed both indoors and outdoors, in ducts, tunnels, underground (trenches), and areas exposed to stray currents. Cables in the “UF” version can be installed in open air without protection from solar radiation. Cables with wire armor can be laid in seismically active regions, in areas with soil displacement, in embankments, marshy grounds, as well as on the bottom of water bodies without burial.
Cables with flat-shaped conductors are intended for use in telephone exchanges, mobile communication base stations, data centers, uninterruptible power supplies, and similar equipment where a cable with low inductance and high electromagnetic compatibility is required.
Power cable for use in intrinsically safe circuits
in explosive environments Vz-KUSIL
Fire-resistant cables (with the “FR” index) are designed for use in emergency protection systems (EPS), fire protection networks, as well as for powering equipment that operates during a fire.
Cables can be used in subway facilities.
The main characteristics of the cables are provided in Table 1.

Cable design

Conductors
KUSIL cables are manufactured with copper single-wire or multi-wire conductive conductors in accordance with Table 2. The flexibility class of the cable conductors in standard execution is 1 or 2, while in execution with increased flexibility conductors “G” – class 5 according to GOST 22483. Cables with the “l” index are produced with tinned conductors.
The number and nominal cross-section of the conductors are specified in Table 3. By agreement with the customer, cables with a nominal voltage of 0.66 and 1 kV may be manufactured with conductors having a nominal cross-section of up to 6 mm² and up to 61 conductors inclusive, as well as cables with a nominal voltage of 3 kV with conductors having a nominal cross-section of less than 10 mm².
Shape of conductive conductors:
- Round shape – in single-core cables of all cross-sections and multi-core cables with conductors of nominal cross-section up to 50 mm² inclusive,
- Segmental shape – in two-core cables with conductors of 70 mm² and larger,
- Sector shape – in 3-core, 4-core, and 5-core cables with conductors of 70 mm² and larger,
- Flat shape – in cables with a nominal voltage of 0.66 and 1 kV, with conductors up to 16 mm² inclusive.
Multi-core cables have all conductors of equal cross-section. Four-core cables with conductors of a nominal cross-section of 25 mm² and larger may have a grounding (PE) or neutral (N) conductor of a smaller cross-section (see Table 4).
In fire-resistant “FR” cables, conductive conductors under the insulation are wrapped with mica-containing tapes, preventing conductor short circuits in case of fire.
The insulation of conductors can be made from materials (see Table 5):
- PVC compound “V”,
- Halogen-free polymer composition “P”,
- Cross-linked polyolefin “Ps”,
- Ethylene-propylene rubber “Rep”,
- Thermoplastic elastomer “T”.
The insulation color of multi-core cables is specified in Table 6. The insulation of single-core cables can be any color. Grounding (PE) conductors have a green-yellow color, and neutral (N) conductors are blue (light blue).
The marking of insulated conductors is either color-coded or numerical – in the form of numbers, with distances between them not exceeding 50 mm.
Individual Shield
Each conductor of the cable may have an individual shield:
- “Em” – Braiding of copper wires,
- “El” – Braiding of tinned copper wires.
Core
Insulated or shielded insulated conductors of round multi-core cables are twisted into a core.
The insulated conductors of “Vz” version cables are twisted around a profiled core made of polymer material to ensure longitudinal sealing and impact resistance.
A water-blocking tape is applied over the twisted core of multi-core cables and over the insulation of single-core cables to prevent longitudinal moisture spread in case of damage to the outer sheath.
An extruded separating layer is applied over the tape, filling the free spaces between the conductors. As a result, the cable has a round cross-section, preventing explosive gas mixtures from traveling through the sealed cable from the hazardous area to the safe zone in case of sheath damage. A round-section cable can be used with any type of cable gland.
In fire-resistant “FR” cables without armor, an additional mica-containing tape is applied over the separating layer.
Overall Shield
An overall shield can be applied over the separating layer or wrapping in the form of:
- “E” – Wrapping of copper tape,
- “Em” – Braiding of copper wires,
- “El” – Braiding of tinned copper wires,
- “Ea” – Alumoflex,
- “EaEl” – Overwrapping of alumoflex foil followed by braiding of tinned copper wires.
The presence of an overall shield is mandatory for unarmored cables with a nominal voltage of 3 kV.
In armored cables with an overall shield, an extruded separating layer is applied over the shield.
Armor
Cables may have armor:
- “K” – Wire armor made of galvanized steel wires, applied in the form of a continuous spiral,
- “B” – Tape armor made of galvanized steel tapes, with the upper tape overlapping the gap between the turns of the lower tape.
Outer Sheath
The outer sheath of the cables can be made of materials (see Table 5):
- PVC compound,
- Halogen-free polymer composition,
- Thermoplastic elastomer.
The color of the outer sheath is determined upon order (blue, orange, red, etc.); if not specified, cables are manufactured in black.
Special Cable Versions:
- “T” – High heat resistance, operating at temperatures up to +200°C (only for material “T”),
- “HL” – Cold-resistant, cable installation without additional heating is possible at temperatures down to -30°C,
- “EHL” – Resistant to extremely cold conditions, installation possible at temperatures down to -40°C,
- “AHL” – Resistant to Antarctic cold climate, installation possible at temperatures down to -45°C,
- “UF” – Resistant to solar radiation, category 1 placement per GOST 15150: resistant to rain exposure, dynamic abrasive dust impact, frost formation,
- “H” – Resistant to acids, alkalis, and environments with a high hydrogen sulfide content,
- “M” – Resistant to gasoline and industrial oil,
- “ZG” – Sheath resistant to rodents, ants, and termites. “ZG” cable has a fire hazard rating of “ng(C)-HF” or “ng(C)-FRHF”. The sheath is orange in color.

Manufacture of cables by special order

- with length marking on the cable sheath,
- with a different number and nominal cross-section of conductors,
- with a different class of conductive cores,
- with a combined cross-section of conductive cores,
- combined transmission cables – simultaneously transmitting electrical energy (through conductive cores) and optical signals (through optical fibers).
Flexible power cable with flat conductors
KUSIL-G ng(A)-HF 2x10mk(l) PEaEl-P-UF – 0.66
– analog of TFL 492 325/0 cable

Table 1. Technical specifications

Nominal voltage (U)	AC voltage with a nominal frequency of 50 Hz: 0.66 kV; 1 kV; 3 kV
Electrical insulation resistance at t = +20°C, not less than	– for cross-linked polyolefin insulation: 150 MΩ/km, – for other types of cables: (1–4) mm² – 12 MΩ/km, (6–25) mm² – 10 MΩ/km, (35–500) mm² – 5 MΩ/km, (625–1000) mm² – 3 MΩ/km.
Electrical resistance of conductive cores at t = +20°C	– complies with GOST 22483-2012, – cores with a nominal cross-section of 630 mm²: not more than 0.0283 Ω/km.
Voltage test with AC at 50 Hz / 10 min	– 3000 V for cables with a nominal voltage of 0.66 kV, – 3500 V for cables with a nominal voltage of 1 kV, – 9500 V for cables with a nominal voltage of 3 kV.
Operating temperature range (stationary)	–60° to +50°C for cables with the “HL” index, –70° to +50°C for cables with the “EHL” index, –90° to +50°C for cables with the “AHL” index, –60° to +125°C for cables with material “T”, –50° to +200°C for cables with material “T” and the “T” index, –50° to +50°C for other types of cables.
Minimum installation temperature, not below	–30°C for cables with the “HL” index or material “T”, –40°C for cables with the “EHL” index, –45°C for cables with the “AHL” index, –15°C for other types of cables.
Impact resistance at low temperatures	–40°C for “HL” cables, –60°C for “EHL” and “AHL” cables.
Climatic performance as per GOST 15150	Performance “UHL” and “V”, placement categories 1 and 5. Suitable for use in all macroclimatic regions, including the tropics.
Fire resistance of cables with the “FR” index	– at least 180 min under open flame exposure at t = (750 ± 50)°C, – at least 120 min under open flame exposure at t = (830 ± 40)°C with mechanical impact (“Vz” fire-resistant cables).
Longitudinal moisture penetration resistance	Fully blocked within 0.5 m from the penetration point (all cables use a special water-blocking tape).
Mold resistance	Cables are resistant to mold fungi, with a biological growth rating of up to 2 points.
Minimum bending radii during installation and operation, in Dn (outer cable diameter), not less than	– 10 Dn for single-core cables, – 7.5 Dn for multi-core cables, – 5 Dn for highly flexible cables (“G”) without armor.
Permissible pulling force during cable laying, not more than	Not more than 50 N/mm² of conductor cross-section.
Service life, not less than	– cables with material “T” (thermoplastic elastomer) – at least 25 years, – other cables – at least 30 years.
Warranty period	5 years from the date of commissioning.

Table 2. Nominal conductor cross-section depending on the type and shape of the conductor

Conductor type	Nominal conductor cross-section, mm²
Conductor type	Round	Sector (Segmental)
Single-wire	1.0 – 50	–
Multi-wire	1.0 – 1000	25 – 400

Table 3. Conductor cross-section depending on the number of conductors in the cable and the nominal voltage

Number of conductors	Nominal voltage, kV
	0.66	1	3
	Nominal conductor cross-section, mm²
1	1.0 – 50	1.5 – 1000	(10 – 1000) *
2 – 5		1.5 – 400	10 – 240
* only for shielded cables

Table 4. Nominal cross-section of a single lower-section conductor (N or PE) in four-core cables

Conductor designation	Nominal conductor cross-section, mm²
Main	25	35	50	70	95	120	150	185	240	300	400
Neutral (N) or grounding (PE)	16	16	25	35	50	70	70	95	120	150	185

Table 5. Fire hazard indicator depending on the sheath and insulation material

Designation of sheath and insulation material	Fire hazard rating	Description of sheath and insulation material, as well as cable type according to the fire hazard rating per GOST 31565
V	_– (no index)	cables with PVC plastic insulation and sheath, not propagating fire during single installation
	ng(A)	cables with PVC plastic insulation and reduced flammability PVC plastic sheath, not propagating fire during group installation of category A
	ng(A)-LS	cables with low fire hazard PVC plastic insulation and sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-LSLTx	cables with low fire hazard PVC plastic insulation and sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission, and low toxicity of combustion products
	ng(A)-FRLS	fire-resistant cables with low fire hazard PVC plastic insulation and sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-FRLSLTx	fire-resistant cables with low fire hazard PVC plastic insulation and sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission, and low toxicity of combustion products
P	ng(A)-HF	cables with halogen-free polymer composite insulation and sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
P	ng(A)-FRHF	fire-resistant cables with halogen-free polymer composite insulation and sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
Ps	ng(A)-LS	cables with cross-linked polyolefin insulation and low fire hazard PVC plastic sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-FRLS	fire-resistant cables with cross-linked polyolefin insulation and low fire hazard PVC plastic sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-HF	cables with cross-linked polyolefin insulation and halogen-free polymer composite sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
	ng(A)-FRHF	fire-resistant cables with cross-linked polyolefin insulation and halogen-free polymer composite sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
Rep	ng(A)-LS	cables with ethylene-propylene rubber (EPR) insulation and low fire hazard PVC plastic sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-FRLS	fire-resistant cables with ethylene-propylene rubber (EPR) insulation and low fire hazard PVC plastic sheath, not propagating fire during group installation of category A, with reduced smoke and gas emission
	ng(A)-HF	cables with ethylene-propylene rubber (EPR) insulation and halogen-free polymer composite sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
	ng(A)-FRHF	fire-resistant cables with ethylene-propylene rubber (EPR) insulation and halogen-free polymer composite sheath, not propagating fire during group installation of category A and not emitting corrosive gaseous products during combustion and smoldering
T	ng(A)	cables with thermoplastic elastomer insulation and sheath, not propagating fire during group installation of category A
T	ng(A)-FR	fire-resistant cables with thermoplastic elastomer insulation and sheath, not propagating fire during group installation of category A

Table 6. Insulation color of conductors in multi-core cables

Number of conductors in the cable	Conductor insulation color
	Conductor sequence number
	1	2	3	4	5
2	gray*	blue	–	–	–
3	gray*	brown	black	–	–
3	gray*	blue	green-yellow	–	–
4	gray*	brown	black	blue	–
4	gray*	brown	black	green-yellow**	–
5	gray*	brown	black	blue	green-yellow
* or natural ** as agreed with the customer

Table 7. Permissible current loads of cables

Nominal conductor cross-section, mm²	Permissible continuous current loads, A for cables with sheath and insulation material designation “V”, “P”, “T” / “Ps”, “Rep”						Permissible one-second short-circuit currents of cables, kA
	Single-core				Multi-core**		Cables with material “V”, “P”, “T”	Cables with material “Ps”, “Rep”, as well as all “FR” cables
	For direct current		For alternating current*		For alternating current
	In air	In soil	In air	In soil	In air	In soil
1	17 / 20	24 / 27	14 / 17	18 / 20	13 / 15	16 / 18	0,11	0,14
1,5	29 / 35	41 / 48	22 / 28	30 / 33	21 / 25	27 / 31	0,17	0,21
2,5	37 / 46	55 / 63	30 / 36	39 / 42	27 / 34	36 / 40	0,27	0,34
4	50 / 60	71 / 82	39 / 47	50 / 54	36 / 45	47 / 52	0,43	0,54
6	63 / 76	90 / 102	50 / 59	62 / 67	46 / 56	59 / 64	0,65	0,81
10	86 / 105	124 / 136	68 / 82	83 / 89	63 / 78	79 / 86	1,09	1,36
16	113 / 139	159 / 175	89 / 108	107 / 115	84 / 104	102 / 112	1,74	2,16
25	153 / 188	207 / 228	121 / 146	137 / 147	112 / 141	133 / 144	2,78	3,46
35	187 / 230	249 / 274	147 / 180	163 / 176	137 / 172	158 / 173	3,86	4,8
50	227 / 281	295 / 325	179 / 220	194 / 208	167 / 209	187 / 205	5,23	6,5
70	286 / 356	364 / 399	226 / 279	237 / 255	211 / 265	231 / 253	7,54	9,38
95	354 / 440	436 / 478	280 / 345	285 / 306	261 / 327	279 / 304	10,48	13,03
120	413 / 514	499 / 546	326 / 403	324 / 348	302 / 381	317 / 347	13,21	16,43
150	473 / 591	561 / 614	373 / 464	364 / 392	346 / 437	358 / 391	16,3	20,26
185	547 / 685	637 / 695	431 / 538	442 / 443	397 / 504	405 / 442	20,39	25,35
240	655 / 812	743 / 821	512 / 641	477 / 515	472 / 598	471 / 515	26,8	33,32
300	760 / 956	845 / 924	591 / 739	539 / 501	542 / 688	533 / 583	33,49	41,64
400	894 / 1124	971 / 1060	685 / 860	612 / 661	633 / 807	611 / 669	39,6	55,2
500	1054 / 1328	1121 / 1223	792 / 997	690 / 746	– / –	– / –	49,5	69
625/630	1252 / 1576	1299 / 1416	910 / 1149	774 / 840	– / –	– / –	62,37	86,95
800	1481 / 1857	1502 / 1632	1030 / 1302	856 / 932	– / –	– / –	79,2	110,4
1000	1718 / 2163	1709 / 1862	1143 / 1451	933 / 1019	– / –	– / –	99	138
* Laid in a tightly packed triangular formation ** For four-core and five-core cables, the current load values should be multiplied by a factor of 0.93

Table 8. Permissible conductor heating temperatures during operation

Insulation Material	Permissible Conductor Heating Temperature, °C
Insulation Material	Continuous permissible	Overload mode	Maximum during short circuit	Non-ignition condition during short circuit
PVC plastic compound; halogen-free polymer composition	70	90	160/140*	350
Cross-linked polyolefin; ethylene-propylene rubber	90	130	250	400
Thermoplastic elastomer	125	150	200	350
High heat-resistant thermoplastic elastomer	200	220	250	350
* For cables with conductors of more than 300 mm² cross-section

Conditional designation when ordering

“Vz” version
	No requirements for compliance with GOST R 58342-2019
Vz-	The cable complies with GOST R 58342-2019 and is intended for use in explosive environments

Number of conductors (see Tables 2 and 3)

1…5 – number of conductors in the overall twist, up to 61 conductors by agreement

Conductor type (see Table 2)
ok	Single-wire round conductor
os	Single-wire sector or segmental conductor
mk	Stranded round conductor
ms	Stranded sector or segmental conductor

Conductor tinning
	Untinned conductor
(l)	Tinned conductor

Sheath and insulation material (see Table 5)
V	PVC plastic compound
P	Halogen-free polymer compositions
T	Thermoplastic elastomer
Ps	Cross-linked polyolefin insulation, PVC or halogen-free sheath
Rep	Ethylene propylene rubber (EPR) insulation, PVC or halogen-free sheath

Armor under outer sheath
	Non-armored cable
K	Solid layer of galvanized wires
B	Steel galvanized tape armor

Nominal AC voltage (U), kV

0,66

1

3

Vz-

KUSIL

-G

ng(A)

3

x

35

mk

(L)

(N)

Em

V

E

-P

K

–

EHL

–

0.66

Conductor flexibility class
	Standard flexibility (Class 1 or 2 conductors according to GOST 22483)
-G	Increased flexibility (Class 5, conductors up to 50 mm²)

Conductor cross-section, mm² (see Table 2 and 3)

1.0…1000 – nominal conductor cross-section

Fire hazard rating (see Table 5)

–

ng(A)

ng(A)-LS

ng(A)-LSLTx

ng(A)-HF

ng(A)-FR

ng(A)-FRLS

ng(A)-FRLSLTx

ng(A)-FRHF

Presence of neutral and/or grounding conductor
	not required
(N)	neutral conductor
(PE)	grounding conductor
(N, PE)	neutral and grounding conductor

Individual shielding of each conductor
	without individual shielding
Em	braid of copper wires
El	braid of tinned copper wires

Cable with flat conductors (two- and three-core cables)
	round-shaped cable
-P	cable with flat conductors (only 0.66 kV and 1 kV, with conductors up to 16 mm²)

Overall shielding over all conductors
	without overall shielding
E	copper tape wrapping
Em	braid of copper wires
El	braid of tinned copper wires
Ea	alumoflex
EaEl	braid of tinned copper wires applied over alumoflex wrapping

Special Cable Characteristics
	no special characteristic
HL	increased frost resistance (down to -60°C)
EHL	resistance to extreme cold conditions (down to -70°C)
AHL	resistance to Antarctic cold climate (down to -90°C)
UF	resistance to solar radiation, exposure to rain, dynamic abrasive dust impact, and frost formation
M	oil and fuel resistance*
H	resistance to chemically aggressive environments
T	heat resistance up to +200°C (only for material “T”)
ZG	sheath resistance to damage by rodents, ants, and termites. Fire hazard indicator “ng(C)-HF” or “ng(C)-FRHF”
s	outer sheath in blue color

Note:

* Four-core cables with conductors of 25 mm² or more may have one PE or N conductor of a smaller cross-section (see Table 4). In the designation of these cables, a plus sign is used to add the number and nominal cross-section of the grounding conductor. For example: KUSIL ng(A) 3x120ms + 1x70ms(N) VB-1

Examples of Cable Designation in Orders
KUSIL ng(A)-LS 3×2.5ok V-HL–0.66 TU 3500-013-76960731-2008	Flame-retardant, with low smoke and gas emission, with insulation and sheath made of PVC compounds with reduced fire hazard, with three single-wire round conductors of nominal cross-section 2.5 mm², round cable in cross-section, with extruded filling between conductors, for nominal voltage of 0.66 kV, operating temperature from -60º to +50ºC, installation down to -30ºC.
Vz-KUSIL ng(A)-HF 5x95ms(PE) PEl–1 TU 3500-013-76960731-2008	Cable for use in explosive environments, compliant with GOST R 58342-2019, flame-retardant, with insulation and sheath made of halogen-free polymer compositions, with an overall screen in the form of a braid of tinned copper wires, with five multi-wire sector-shaped copper conductors of nominal cross-section 95 mm², one of the conductors being a grounding (PE) conductor, round cable in cross-section, with extruded filling between conductors, for nominal voltage of 1 kV, operating temperature from -50º to +50ºC, installation down to -15ºC.

KUSIL low-voltage cable