6/9/2016

1

PLT108 ENGINEERING PLT108 ENGINEERING SKILL IISKILL II

MODULE 1B (WIRING-DB)

MR. SOFI BIN YAHYA

Image of Distribution Board

What is DB? Distribution Board – Panel Board or

Breaker Panel Divides an electrical power feed into

subsidiary circuits Includes an electrical components Includes 3 phase or single phase wiring Life, Neutral and Earth wiring system

TNB to Domestic supply voltage

How TNB supply the voltage to domestic? 415/240 V from TNB step-down

Transformer TNB Fuse and Kilowatt Meter 3 phase /

single phase outside building DB and load 3 phase / single phase wiring

inside building

From TNB 415/240 V DB

KW meter /

FuseLoad

Outside Inside

6/9/2016

2

Image of TNB supply voltage to Domestic

Image of an electrical components inside the DB

What is electrical components inside the DB?

Main Switch – normally 63 - 125 Amps MCCB – normally 40 ~ 63 Amps RCCB / ELCB – normally 40 ~ 63 Amps MCB – normally 32, 20, 16, 10, 6 Amps Copper Bus Bar/ Wire (L,N & E) Earth Sub Circuit Connector Neutral Sub Circuit Connector

Image of single phase wiring connection circuit diagram in DB

6/9/2016

3

Image of 3 phase wiring connection circuit diagram in DB

Image of Main Switch

Main Switch? Separate from inside to outside wiring life

and neutral wire or life wire only before to distribute to MCBs.

Like emergency stop button Able to control by human Fuse built-in from 60 – 125 amps Have 3 phase and Single Phase

Image of RCCB or ELCB

RCCB or ELCB? Residual Current or Earth Leakage Circuit

Breaker also known as Automatic CB ELCB older version and many domestic

replace to RCCB Protection components from overload

current, short circuit and lightning. Press the button for testing the

functionality of components Current ratting 40 -60 Amps

6/9/2016

4

Image of MCB

MCB? Miniature Circuit Breaker

Fuse Amps Cable Size Output

32 4 mm Heater max 3, Air –cond 1500 up hp 1- 3 max, Motor

20 2.5 mm Air-cond 1000 hp max 1, plug max 3.

16 2.5 mm Plug max 2

10 1.5 mm Lamps max 10, fans max 10 or lamps + fans max 10

6 1.5 mm Lamps max 7, fans max 7 or lamps + fans max 7

Example of wiring single phase diagram

Example of wiring 3 phase diagram

6/9/2016

5

Image of Schematic Diagram of Wiring System

Image of Schematic Diagram of Wiring System

Thank YouThank You