1. Overview
Mineral Insulated cable is often simplified as MI cable, with a more familiar name of Magnesia Cable or Fire proof Cable in China. Mineral insulated cable has a long history overseas. In late 19th century, Arnold Francois Borel, a Swiss engineer, put forward sush idea as mineral insulated cable and patented in 1896. From 1934to 1936, France and England made a rapid progress after introducing such manufactures. Meanwhile, other, industrialized countries also began to produce mineral insulated cable, China also did some researches during 1960s, and proceeded with mass production at the end of 20th century.

2. Structure
A mineral insulated cable comprises the cooper conductor, magnesium oxide imsulator, a copper sheath. If necessary, there is outer plastic jacket outside copper sheath. It can be provided with an Halogen-free,

3. Merits
As MI cable is made of inorganic materials, therefore it has some characteristics superior to any other cables, such as fire proof, high current rating, high strengh, halogen-free and no toxicity, esposion proof, water proof, corrosion resistance, long service life, high overload, high operating temperature, low cost and small curve radius etc...

4. Denotation
Characters VoltageGrade model Name Core number Cross Section mm2
Light duty, 500V, BTTQ, Mineral insulated copper sheathed cable with PVC copper condcutor, (Light duty) 1\2\3\4\7 1-4mm2
BTTVQ Mineral insulated copper sheathed cable with copper condcutor and outer covering (light duty) 1\2\3\4\7, 1-4mm2
Over loading 750V BTTZ Mineral insulated copper sheathed cable with copper condcutor (heavy duty) 1\2\3\4\7\10\12\19 1-400mm2
BTTVZ Mineral insulated copper sheathed cable with copper condcutor and PVC outer covering (heavy duty) 1\2\3\4\7\10\12\19 1-400

Example 1: The 2.5 mm2 Single-core light duty(500V) mineral insulated copper sheathed cable with copper condcutor is indicated as BTTQ-500 1× 25
Example 2: The 25 mm2 Single-core light duty(750V) mineral insulated copper sheathed cable with copper condcutor is indicated as BTTZ-750 3× 25
Example 3: The 150 mm2 four cores heavy duty(750V) mineral insulated copper sheathed cable with copper condcutor PVC outer covering is indicated as BTTZ-750 4× (1× 25)