Main Switch and Switch Board

Main Switch and Switch Board

1.     Main switch may be either metal clad or insulated and of enclosed pattern . it should be installed near the point of entry of the supply line in a house .

2.     A bare or partly covered switchboard may be installed only in dry and well ventilated place where no fume arises due to acid or other chemical or where no storage battery has been installed nearby . If , However the place is damp or full of combustible particles or where there is continuous presence of gas or vapour, the switchboard to be installed must be totally enclosed type and made of flame proof material.

3.     In case the front side of the switchboard cannot be totally closed by hinged cover or if it is installed in a place where entry is restricted only to authorized persons, the bottom of the switchboard must remains at a height of at least 1.25 meters above the floor levels.

4.     A switchboard must not be installed in kitchen , lavatory  or bathroom or within 2.5 meters from gases stove , washing basin , sink or laundering  machine .

5.     If a switchboard is required to be installed in an open space where water drop or where space is very much humid, its outer cover must not be affected by the surrounding environment. Moreover this type of outer cover must be fitted with screwed conduit or bush.  

 

Types of wires

 

1. Though Rubber sheathed
2. Metal Sheathed
3. Weather Proof Wires
4. Wires with Thermo Plastic Insulation
5. Flexible cord and Flexible Cable
6. Twin Rubber Insulated Flexible Cord
7. Twin Silk flexible Cord
8. Twin Twisted and Cotton Braided Flexible Cord
9. Paper Insulated Cable
10. Tropodur Cables
11. Mineral Insulated Cable