Mineral Insulated Cable

BTTZ,BTTVZ and WD-BTTYZ(heavy-duty)apply to occasions where the voltage between wire core and sheath,between wire core and wire core is no larger than 750V alternating current and direct current virtual value.
BTTQ,BTTVQ and WD-BTTYQ(light-duty)apply to occasions where the voltage between wire core and sheath,between wire core and wire core is no larger than 500V alternating current and direct current virtual value.
Under following circumstances.mineral insulated cable shall be used with plastic sheath.
1.1If the cable is laid where it is corrosive to copper sheath:
1.2When the cable is buried directly or in conduits;
1.3When the cable is exposed in non-technical space of buildings,where have aesthetic
requirements; For fire prevention places.halogen-free low-smoke plastic outer sheaths shall be used.

2.1 According to laying environment of cables,we shall decide maximum operation temperature of cables,reasonably choose the corresponding current-carrying capacity,and then decide the cable specification.
2.1.1 According to different cable temperatures mineral insulated cable has 2kinds of current-carrying capacity.
Current-carrying capacity when the temperature is 70℃ .
Current-carrying capacity when the temperature is105℃ .
2.1.2 Under following laying conditions,current-carrying capacity shall be chosen according to normal operation temperature-70℃.
a. Exposed laying along walls,brackets,roof plates and bridges;
b.Mineral insulated cable is laid together with other types of cables in the same bridge,silo,cable trench and cable tunnel.
c.Other places where too high temperature of cable sheaths easily hurt humans or damage the equipment.
2.1.3 If mineral insulated cable is laid separately in bridges,cable trenches and conduits where no human touches it,current-carrying capacity can be chosen according to normal operation temperature 105℃.
2 . 2 According to actual length of line and length of delivered cable,we shall reasonably decide the specification of mineral insulated cable.
Because machining length of mineral insulated cable is constricted by raw materials, delivery length of large-size single core and multi-core cable is unable to as long as that of plastic cables. Therefore, please consider the delivery length of cable when choosing the specification,and avoid joints in the middle as much as possible.
Example 1: calculate a line whose load is 1000A, and maximum operation temperature doesn't exceed 70℃.As a result, 400 mm² is chosen according to Table 3. Delivery length is 60 meters according to “cable data sheet”: if the line is longer than 60 meters, please choose 240m²double combinations.Middle joints can be avoided if delivery length reaches 99 meters, and longer lines can uses 240m² double combinations. The longer the line is,the more complex the laying condition is. It is easy to lay small-size cables.
Example 2: Use 4×25mm² multi-core cable according to load calculation. If it is longer than delivery length 124 meter, consider using 4×(1X25) single-core cable,whose delivery length reaches 425 meters and middle joints are Unnecessary.

3.1 Copper sheath can be used as PE ground lead. So PE line is unnecessary generally.
3.2 Corresponding to over 16mm² plastic cable,the section can be reduced. If plastic
cable is designed 4x185+95, the Corresponding mineral insulated cable is BTTZ 4X(1X150). 3.3 It is not necessary to consider coefficients in the case of double Combinations and multiple combinations.
3.4 If double combinations or multiple combinations of large-section cables are used to replace bus duct, construction investment can be reduced and line security is enhanced.
3.5 Our special branch terminal box makes cable branching possible (Refer to P28 for the Branch Box).

Ordinary lighting,emergency lighting,fire alarm,firefighting electrical circuit,emergency lines for elevators and lifts, control circuits of computer rooms, circuits of trunk/branch power distribution systems and double-power control circuits.

Ordinary lighting, power supply,emergency lighting, fire monitoring systems and fire alarm systems, firefighting electrical circuit

Ordinary lighting, emergency lighting, fire alarm, firefighting electrical circuit, ventilation circuits and Lifesaving System

Ordinary lighting,emergency lighting, emergency radio circuits, emergency elevators.circuits for firefighting circuits and lifting equipment

Ordinary lighting, emergency lighting, emergency radio circuits, circuits for emergency elevators and lifting equipment

Ordinary lighting, emergency lighting, Control circuits of fire alarm, firefighting electrical circuit

Ordinary lighting, emergency lighting, fire alarm, flue gas emission firefighting circuital ventilation circuits

Ordinary lighting, emergency lighting, fire alarm and firefighting electrical circuit

Ordinary lighting,emergency lighting, high temperature places, firefighting circuits ,large power circuits and circuits for potential hazardous explosion zone

Power supply circuits for generator rooms , fire monitoring systems, fire alarm systems, flue gas emission and Ventilation circuits, kitchen electrical circuits, large power circuits ,double-power control circuits,emergency lighting, emergency radio circuits, control circuits of computer rooms

Power and control circuits under high temperature environment, emergency power supply large power circuits, continuous power supply circuits, power supply circuits for generator.

Large power circuits,ordinary lighting,emergency lighting, fire alarm and fire lighting circuits.

Ordinary lighting,emergency lighting,control circuits of computer rooms, large power circuits, power and control circuits under high temperature environment, and circuits for potential hazardous explosion zone.

Ordinary lighting, emergency lighting, control circuits of computer rooms, large power circuits, power and control circuits under high temperature environment, and circuits for potential hazardous explosion zone

Ordinary lighting,emergency lighting,fire alarm,flue gas emission,flammable, explosive and ventilation circuits.

Smoke exhaust fans,high-frequency heating furnace, high temperature places and firefighting circuits, large power circuits.