Explosion-proof cable glands KOVTN (FETAM) for armored cable in hoses, conduits, metal hoses; outer thread for external connection

Explosion-proof cable glands KOVTN (FETAM) for armored cable in hoses, conduits, metal hoses; outer thread for external connectionPURPOSE AND SCOPE OF APPLICATION

Explosion-proof cable glands KOVTN for non-armored cable in hoses, conduits, metal hoses are used in areas, where explosion-proof sealing on the cable sheath is required, they protect the cable against accidental pulling out. The distinct feature of explosion-proof cable glands KNVTV is the inner thread for external connection, which helps to connect flexible hoses, conduits, corrugated metal hoses, etc.

The most important development is the use of one sealing ring for the whole range of diameters of crimped cable, which reliably crimps the incoming cable and ensures Exd type of protection. One sealing ring together with mandrel or cable withstand the force in newtons, which is equal to the twentyfold diameter value (in mm) of the mandrel or the cable. This helps to use KOVTN series explosion-proof cable glands without additional unloading of cable.

Increased wall thickness of bodies of GORELTEX cable glands considerably enhances their strength compared with cable glands of other manufacturers.

Combined single orientation clamping system of the armor and sealing of cable inner sheath are used in KOVTN series cable glands. Such combined system helps to avoid phase-to-phase voltage/ linear shift between inner sheath and armor/braid of the cable during mounting of cable gland. Mounting of KOVTN series cable gland is more convenient and error-free: presence of a combined fastening element does not require constant balancing between fastening clamp of the armor and that of the cable inner sheath. This guarantees high-quality sealing of the cable inner sheath and reliable galvanic coupling between cable gland body and cable armor. Dimensions of cable glands are significantly reduced which helps to save space and reduce the weight of the explosion-proof device.

Clamping ring of the armor helps to use KOVTN cable gland for all types of cable armor/braid: single-wire armor, with braid, tape armor, wire armor. Clamping ring of the armor helps to crimp armor/braid with the thickness from 0 to 3.5 mm (KOVTN01-...-KOVTN5 from 0 to 2.5 mm, starting from KOVTN6 from 0 to 3.5 mm). External sealing ring for ingress protection prevents ingress of water into cable gland, which can cause damage to armor/braid.

KOVTN explosion-proof cable glands ensure earthing circuit continuity between cable armor/braid and cable gland body by means of clamping ring of the armor/braid that ensures protection against electromagnetic disturbances. PG-GERMETIC waterproof insulation is used for protection in case of continuous flooding of cable armor/braid. Cable glands conform to DTS01 requirements.

KOVTN cable glands may be used for direct insertion as a part of fireproof enclosures of IIA, IIB+H2, IIC subgroups, which have the volume exceeding 2000 cm3.

KOVTV explosion-proof cable glands are completely suitable for use with equipment having ExnR marking.

Thanks to their design, KOVTN explosion-proof cable glands ensure cable unloading. These cable glands ensure protection against pulling out without causing damage to the structure of cable sheath and conductors, as well as prevent cable overcompression.

When choosing KOVTN series cable gland, it is necessary to consider that dimension type of thread at the outlet is larger than at the connecting part.

Explosion-proof cable glands of KOVTN series are designed in Russia (Patent No. 155936, rightholder "ZAVOD GORELTEX" Co. Ltd. (former "CORTEM-GORELTEX" Co. Ltd.), operating characteristics of which significantly surpass Russian and foreign analogues.

Scope of application – outdoor and indoor hazardous areas as per explosion protection marking, GOST 30852.13-2002 (IEC 60079-14:1996), dangerous production facilities of I, II, III, IV hazard class supervised by Rostechnadzor of the RF and national technical supervision bodies of the Customs Union and CIS countries.

ГОСТ 14254-96 (МЭК 529-89), ГОСТ 30852.8-2002 (МЭК 60079-0:1998), ГОСТ 30852.14-2002, ГОСТ 30852.10-2002 (МЭК 60079-11:1999), ГОСТ Р МЭК 60079-0-2011, РД 5.2-093-2004, ГОСТ IEC 60079-1-2011, Гл. 7.3 ПУЭ, Гл. 7.4 ПУЭ, ТР ТС 012/2011, ТР ТС 004/2011
Маркировка взрывозащиты Marking:
1Ex db IIC Gb
1Ex e IIC Gb
2Ex nR IIC Gc
Ex tb IIIC Db
1Ex db IIC Gb X*
1Ex e IIC Gb X*
2Ex nR IIC Gc X*
Ex tb IIIC Db X*
*условия указаны в руководстве по эксплуатации *conditions are specified in the operating instructions
Mining equipment marking:
РН1, РН2
Ambient temperature, °С:
-60...+130 for explosion protection type "d"
-60...+185 for explosion protection type "e", "ia", "nR"
Nickel-plated brass resistant to vapor of hydrogen sulphide, hydrochloric acid and sea fog, NK code
Stainless steel grade 08Х18Н10 as per GOST 5632-2014 (AISI 304) N code
Climatic version:
NF1 (upon request NF2, NF3, NF4, NF5, F1, F2, F3, F5, T1, T2, T3, T5, MU1, MU2, MU3, MU4, W2.1, W5)
Protective plug (for closing of unused cable gland)
External seal for ingress protection (IP) on thread (cylindrical and metric thread)
Locknut (cylindrical and metric thread)
Grounding ring
Stainless steel grade 03Х17Н13М2 as per GOST 5632-2014 (316L)
Additional sealing ring for extension of the crimped cable diameter range
Marine version
Non-explosion-proof version
Cap for additional protection of the cable gland
Explosion-proof cable glands KOVTN
Explosion-proof cable glands KOVTN (FETAM), metric thread GOST 24705
Cable gland dimension type Thread Dimensions, mm Diameter of crimped cable, mm Mass, kg
all files
Main Alternative M1, GOST 24705 M2, GOST 6357-81 ØM C Inner Ød Outer ØD
KOVTN1M2G FETAM1IC M20x1,5 3/4" 39 118 6-12 9-17 0,3
KOVTN1M2G.../P FETAM1IC.../R M20x1,5 3/4" 39 118 3-12 9-17 0,3
KOVTN2M3G FETAM2IC M25x1,5 1" 47 132 12-18 15-25 0,5
KOVTN2M3G.../P FETAM2IC.../R M25x1,5 1" 47 132 6-18 9-25 0,5
KOVTN3M4G FETAM3IC M32x1,5 1 1/4" 58 140 18-25 21-31 0,7
KOVTN3M4G.../P FETAM3IC.../R M32x1,5 1 1/4" 58 140 12-25 15-31 0,7
KOVTN4M5G FETAM4IC M40x1,5 1 1/2" 65 135 25-31 27-37 1
KOVTN4M5G.../P FETAM4IC.../R M40x1,5 1 1/2" 65 135 18-31 24-37 1
KOVTN5M6G FETAM5IC M50x1,5 2" 76 142 31-39 36-46 1,4
KOVTN6M7G FETAM6IC M63x1,5 2 1/2" 96 151 39-47 45-53 2,2

Explosion-proof cable glands KOVTN (FETAM), taper inch thread NPT
Cable gland dimension type Thread Dimensions, mm Diameter of crimped cable, mm Mass, kg
Main Alternative M1, NPT M2, ГОСТ 6357-81 ØM C Inner Ød Outer ØD
KOVTN1N2G FETAM1N2C 1/2" 3/4" 39 118 6-12 9-17 0,3
KOVTN1N2G.../P FETAM1N2C.../R 1/2" 3/4" 39 118 3-12 9-17 0,3
KOVTN2N3G FETAM2N3C 3/4" 1" 47 134 12-18 15-25 0,5
KOVTN2N3G/...P FETAM2N3C/...R 3/4" 1" 47 134 6-18 9-25 0,5
KOVTN3N4G FETAM3N4C 1" 1 1/4" 58 145 18-25 21-31 0,8
KOVTN3N4G.../P FETAM3N4C.../R 1" 1 1/4" 58 145 12-25 15-31 0,8
KOVTN4N5G FETAM4N5C 1 1/4" 1 1/2" 65 144 25-31 27-37 1
KOVTN4N5G.../P FETAM4N5C.../R 1 1/4" 1 1/2" 65 144 18-31 24-37 1
KOVTN5N6G FETAM5N6C 1 1/2" 2" 76 155 31-39 36-46 1,4
KOVTN6N7G FETAM6N7C 2" 2 1/2" 96 169 39-47 45-53 2,3

RKN adapter made of galvanized steel for connection of non-explosion-proof corrugated metal hose.*
RKV type НаименовName of metal hose Inside diameter of metal hose, mm Diameter of KOVTN external connection thread, G cylindrical pipe thread GOST 6357-81
RKV12 RZ-TSKH-12, MRPI-12 12 1/2"
RKV15 RZ-TSKH-15, MRPI-15 15 1/2"
RKV20+АВ-2GН-1GВ RZ-TSKH-20, MRPI-20 20 1/2"
RKV20 RZ-TSKH-20, MRPI-20 20 3/4"
RKV25+АВ-3GН-2GВ RZ-TSKH-25, MRPI-25 25 3/4"
RKV25 RZ-TSKH-25, MRPI-25 25 1"
RKV32+АВ-4GН-3GВ RZ-TSKH-32, MRPI-32 32 1"
RKV32 RZ-TSKH-32, MRPI-32 32 1 1/4"
RKV38+АВ-5GН-4GВ RZ-TSKH-38, MRPI-38 38 1 1/4"
RKV38 RZ-TSKH-38, MRPI-38 38 1 1/2"
RKV50+АВ-6GН-5GВ RZ-TSKH-50, MRPI-50 50 1 1/2"
RKV50 RZ-TSKH-50, MRPI-50 50 2"

* In order to connect the metal hoses with different combination of inside diameter and diameter of crimped cable, it is required to use other size of AV adapter.

Гофрированный металлорукав резиновый рукав из хладостойкой резины, армированного сталью

Diameter of crimped cable, mm:
Cable gland thread type:
Cable gland thread size:
Thread type for external connection:
Cable gland material:
Add connection adapter:
Adapter connecting thread size:
Adapter material:
KOVTN X Х Х Х Х / Х  – TU 3400-007-72453807-07
                Cable gland type
                Dimension type
                Thread type: Taper inch NPT - N; Metric GOST 24705 - M; Taper pipe GOST 6211-81 - R; Pipe cylindrical GOST 6357-81 - G
                Dimension type for thread for external connection
                Type of thread for thread for external connection*: Taper inch NPT - N; Metric GOST 24705 - M;
Taper pipe GOST 6211-81 - R; Pipe cylindrical GOST 6357-81 - G
                Material of cable gland: Nickel-plated brass - NK, Stainless steel - N
                Options, accessories and versions

KOVTN3N4GН -TU 3400-007-72453807-07
- Cable type: armored (outer thread)
- Thread: 1" NPT
- Outlet thread: 1 1/4" pipe cylindrical GOST 6357-81G
- Material: stainless steel