Main Protective Bonding

This video describes how to install Main Protective Bonding:

BS 7671

The BS 7671 is a code of practice and is not statutory.

Although what is in the BS7671 covers the required legistation for the electrical installer, and can be used in a court of law in combination with other legislation.

The BS 7671 should be refered to, whilst installing an electrical installation so that you install it:

• To the Regulations.
• That it is safe to use.

It is not a requirement to committ to memory the complete code of practice (BS 7671)

It is a requirement to understand how the BS 7671 has been constructed, and to have a good working knowledge of it's requirements.

Ohms Law and Power

Remember the Formula:  use the triangles:

Series and Parallel Circuits

To calculate a series and parallel circuit you need to apply Ohm's Law and the Power Triangle:

Remember:

To find the total resistance of a Series circuit you add up the resistant values.

Rt = R1 + R2 +R3

To find the total resistance of a parallel circuit apply the equation:

(1/R1) + (1/R2) + (1/R3) = ?

Rt = 1/?

Please go to Electrical Principles tag:

SI Units and Prefixes

listen to ‘SI units and prefixes’ on Audioboo

SI Units and Prefixes

We have cover SI units and prefixes: The most common we will use are as follows:

P = power measured in Watts
R = resistance measured in Ohms
I = current measured in Amperes
V = voltages measured in Volts

The most common prefixes are;

pico 1x10^-12
nano 1x10^-9
micro = 1x10 ^-6
milli 1x10^-3
unit 1
kilo 1x10^3
mega 1x10^6
giga 1x10^9
tera 1x10^12

Introduction

listen to ‘Introduction’ on Audioboo

Get on board!!!

Welcome to the Electrical Department.

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