Metal Sheathed Inorganic Mineral Insulated Cable

Metal Sheathed Inorganic Mineral Insulated Cable

Metal sheathed inorganic mineral insulated fire-resistant flexible cable is a new product which is developed and designed independently by ANHUI HUAYU CABLE GROUP CO., LTD. during about two years. It contains two types: RTTZ、 RTTZE coppe core corrugated copper sheathed inorganic mineral insulated fire-resistant fexible cable and RTGZ、 RTGZE copper core corrugatedstainless steel sheathed inorganic mineral insulated fire-resistant fexible cable. They can be substitutes for BTTZ copper core coppeisheathed mineral insulated cable with almost same manufacturing length as ordimary cable. It has many advantages such as large sections.multi-core, fexibility, large current capacity, fewer joints and east installation.

Type	Description
RTTZ(YTTW)	Copper core corrugated copper sheathed inorganic mineral insulated cable
RTTZE	Copper core corrgated copper sheathed inorganic mineral insulated low-smoke and halogen-freepolyolefin outer sheathed cable
RTGZ(YTGW)	Copper core corrugated stainless steel sheathed inorganic mineral insulated cable
RTGZE(YTGWE)	Copper core corugated stainless steel sheathed inorganic mineralinsulated low-smoke and halogen-free polyolefn outer sheathed cable

Type	Rated Voltage	Cores No.	Nominal Cross Section mm2
RTTZ RTTZE RTGZ RTGZE	450/750v 0.6/1kv	1	1~630
		2,3	1~300
		4,5	1~240
		3+1,4+1	2.5~240
		7~37	1~2.5

1) Conductor: stranded copper wires, excellent flexibility.
2) Insulation: high-temperature and incombustible inorganic mineral.
3) Copper sheath: copper material with good flexibility which can be used as PE wire.Steel sheath: stainless steel, non-magnetic material with good fexibility and better property of corrosion resistance.
4) Outer sheath: except copper sheath, low-smoke and halogen-free polyolefin with good property of corrosion resistanceshall be as outer sheath which is used at chemical industry locations.

1. According to GB12666.6
With 750V between phases, phase and outer sheath, there shall be no damage to the insulation of type A cable while bumning in famewith 950 ℃~1000 ℃ for 90min.
With 750v between phases, phase and outer sheath, there shall be no damage to the insulation of type B cable while buming in fiamewith 750℃~800℃ for 90min.
2. As per BS6378, the fire resistant property by testing of the fireproof fexible cable should comply with following requirements.GGrade A should withstand 650℃ for 3h:
Grade B should withstand 750℃ for 3h:
Grade C should withstand 950℃ for 3h:
Grade S should withstand 950℃ for 20min.

1. Perfect fire-resistant propertyIt is complying with not only 950′ 90min for grade A stipulated in national standard GB12666.6, but also 650′ 3h for grade A750’℃ 3h for grade B and 950’c 3h for grade C stipulated in B56387-1994. water spray and mechanical erash will be bearable for thecable while on fre.
2. Large continuous cable length
Both sigle core and mulli-core cable can be long enough for power supply length. The medium-sized cables can be as long as 1000mwhile 2000m for small-sized cables.
3. Large cross-section
Single-core cable can be as large as 630mm’ while 240 mm’ for multi-core cable.
4. Flexibility
Cables can be woumd round drums with bending radius of no more than 20D (D: outer diameter for cable)
5. No sioke, no toxic gas and halogen-free while burning
For inorgamie material insulation, no toxic gas and leftover after buming for cable. Without secondary pollution and no self-ignition.
it deserves to be called environmental product.
6. Large overload capability
The cable acqures large curent-caurying capacily as well as overload capability, According to winmg requrements, the temperaturefor cable sheath could be as high as 105′ while not being touched and not being together with combustive constnctional materials. Thelong-term working temperature for fire-resistant cable is up to 250℃’under overloading.
7. Resistauce to coloslon
The flexible fire-resistant cable is produced with copper sheath and stainless steel sheath which has good resistance to corrosion. It isdiferent from organic insulated fre-resistant cable which has to be laid in plastic or iron tubes prone to be brittle after aging and msty.
8. No electromagnetic interference (EM)
There are no imnterfere between the cable and information or control cable which are laid together in the same shalt for its metal sheathacting a screen
9. High safety
The fire-resistant cable can still work on fame so as to launch the fire-extinguishing equipment to reduce cost. The copper sheath withcontinuous length as long as cable length, is the good conductor and best grounded PE wire which can improve sensitivity and reliability
for grounded protection.
10. Long service life
The inorganic insulated materials with resistance to high temperatue and aging enioy long service life of many times greater than thalof organic insulated cable. As usual, it will be used as long as the building and much longer for stainless steel sheathed cable
11. Easy installation
Including accessories, transportation and installation for fire-resistant flexible cable is almost as easy as ordinary cable
12. Economical
Produced by advanced techmology and imstalled easily, the overall cost for fexible fire-resistant cable will be reduced comparedmineral insulated cable under the same conditions.
13. Allowable bending radius for the cable

Outer diameter（mm)	D≤12	12<D≤20	20<D≤50
Allowable bending radius for the cable (mm)	6D	10D	15D

1. Rated voltage: up to and including 0.6/1kV.
2. Rated curent: 25A-1800A for single core, 16A-500A for multi-core.
3. Insulation resistance:>100M Ω/km.
4. Power frequency voltage: with 2500V behween phases, phase and metal sheath for cables with rated voltage of 450/750V and 3500\for cables with voltage of 0.6/lkV, those cables shall withstand the voltages for 15min without breakdown.

1. Selection ofsingle core cable and multi-core cableIf the current-carrying capacity is higher than 500A, the single core cable will be used for its higher curent-canrying capacitycompared with mulfi-core cable. And two single core cables can be laid in parallel in order to meet the capacity requrement. However.
the multi-core cable has even impedance for balanced eleetric parameter of each core.
2. Cuent-caiiy capacity of cableAccording to GB/Tl6895.15 ( [EC60287 ), The capacity of the cable is calculated based on ambient temperature of 40′ andworking temperature of 90′, Depending on the situations, in order to increase the capacity, requirement of tenminal voltage drop andsecurity of installation shall be safisfed,
3. Anti-corrosive
If being imstalled at chemical places with moisture and corrosion, RIT2 or RTGZ cable shall used for wonderfiul anti-corosiveproperty of RTTZE cable and better for RTGZE cable.4.Cable grounding
The copper sheath of RTTZ cable with cross-section complying with requirements stipulated is best PE wire. So, the four-core cablecould be used as five-core one, One end of multi-core cable shall be grounded and both ends for single core cable. If one end groundedthe other end must be isolated by electric insulation and the copper sheath may have several grounded points.It will reduce the cost to use RTGZ cable if one single cable used with or without pE wire. kTG;Z cable is the new substilute for lowsmoke halogen-free steel tape armored cable. And it shall be grounded with one end.
5. Branch box and pre-distribution cable
In branch distribution system, Branch box and pre-distribution cable shall be used for no sections to main line so as to reducebreakdown points. The cable can be directly laid by bracket without cable tray.
6. Accessories of cable
As usual, the fire-resistant fiexible cable can be used without any accessories, There wil be termimnals like ordinary cables. if neededour company will provide terminals and connectors.
7. Calculation of designed length ofeableThe fexibility of the cable enables it to remove damages from the natural stress and electromotive power without S or U type jointsThere shall be additional length of 1.$-2 meters for cable bending naturally into S or U during installation.
8. InstallationThe cable can be laid directly without cable tray. The multi-core cable can penetrate the iron pipe pre-bured in floor slabs with irorfastening device. The single core cable is exactly prohibited to be wrapped in iron piece or other high magnetic materials. Some singlcore cables can be wrapped or in pipe together.