Application of Bus bar

Uses of bus bar 

In electric power distribution, a busbar (alsobusbar) is a metallic strip or bar
, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution.

Bus bar Definition

Bus bar

In electric power distribution, a busbar is a metallic strip or bar, typically housed inside switchgear, panel boards, and busway enclosures for local high current power distribution. They are also used to connect high voltage equipment at electrical switchyards, and low voltage equipment in battery banks.

Selection of Distribution Board

1 Size of board

2 Position of board

3 Types of Distribution board - DPIC ,TPIC

1  DPIC ( double pole iron clad) 

2  TPIC (triple pole iron clad) 

Protection

Fuse 

A fuse is a type of low resistance resistor that acts as a sacrificial device to provide overcurrent protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the circuit that it connects. Short circuits, overloading, mismatched loads, or device failure are the prime reasons for excessive current. Fuses are an alternative to circuit breakers. 

HRC FUSE

(1) This type of fuse contains a fuse wire in it, which carries the short circuit current safely for a given time period. During this period, if fault is removed, then it does not blow off otherwise it will melt and remove the circuit from electrical supply hence, the circuit remains safe.

(2) The common material, which is used to make an HRC fuse is glass, but this is not always the case. Other chemical compounds are also used in HRC fuse manufacturing and construction based on different factors. Its external enclosure is made fully airtight in order to avoid the effect of atmosphere on the fuse materials. The major objection on HRC fuse is low and uncertain breaking capacity of semi-enclosed fuse.

Wiring Accessories

Switch 

1 A switch is used to make or break an electrical circuit. It is used to switch ‘on’ or ‘off’ the supply of electricity to an appliance.  There are various switches such as 

2 surface switch

3 flush switch

4 ceiling switch 

5 pull switch

6 push button switch 

7 bed switch 

Classification of MCB

MCB classification 

By color                                         By Pole

1 Black MCB used in -  DC circuits  - Single pole

2 Blue  MCB used in -  Light circuits - Double Pole

3 Brown MCB used in - Power circuit - Triple  Pole

4 Red  MCB used in -  As isolator - Triple Pole neutral 

By Speed                   Used in 

1 Type  B - 3 to 5 times -  Generator 

2 Type C - 5 to 10 times- Residential 

3 Type D - 10 to 15 times - Motors 

Meaning of Rating in MCB 

1 B10

2 C25

3 D2

Select the MCB 

Select the MCB if current rating is 20A.

B20

C20

C25

B25

D20

MCB TYPES

Types of MCB

1 According to speed

2 According to Function 

3 According to color