Welcome to this Electrical Installation taster course.
This is design for learners studying the Level 1 qualification. This qualification is ideal for learners interested in becoming qualified as an Electrician or Maintenance Electrician in Domestic, Commercial & Industrial fields.
Video 1
Watch the YouTube video for some introductory information on the field of electrical installation:
Summary
Electricity travel through wires or conductors, or pieces of metal that transmit electrical force over a distance.
A wire is a conductor that is sheathed by an insulator: the stuff inside the wire can transmit the electrical force and the stuff outside can’t.
A wire is a bit like a water pipe: the electrical force can transmit in the middle of it; just like the water can flow down the middle of the pipe; but it cannot escape the sheath, so it can be transmitted over a distance.
You can transmit electricity via two different currents: AC current and DC current
DC stands for Direct Current: in this wire you have both a positive and negative lead
The DC current is like a river; electrical force will flow through the wires; to a battery, application and back in a continuous flow.
AC stand for Alternating Current. The positive and the negative are not separate; positive and negative currents are switching really quickly, which causes the electrical force to vibrate instead of flow., this is called oscillation
In an Alternating system, there is no positive and negative and there is no flow.
Volts, amps and watts are units to measure electricity
Voltage is the force
Amps measure how much electricity is going through the wire
To use the water-hose comparison again: voltage is like the water pressure in the pipe
Voltage is also a way to measure compatibility
Amperage refers to how much electricity is flowing through the wire. Using the water-hose comparison, it would be how thick the water-hose is, or how big a diameter it has.
If a wire is not big enough to power an appliance, then that wire will give off heat; so much heat that it could cause a fire.
Watts are a combination of volts and amps
Voltage x Amperage = Watts
You can have both parallel connections and series connections
You can change the amp and the volt rating by using both parallel and series connections
Video 2
Have a look at this YouTube video about metal conduit threading.
Summary
Student training aid for practical skills cutting and threading steel conduit. Using a conduit bending machine, 20 mm conduit, stocks and dies. Includes a full demonstration on how to produce a thread in steel conduit.
Video 3
Have a look at this YouTube video about metal conduit bending .
Summary
Step by step guide on how to bend steel conduit with full demonstration. Students training aid for bending 20 mm Steel (metal) Conduit to produce a 90 degree bend to the correct measurement. Includes a full demonstration on how to produce a bend using set square and a conduit bending machine so the end of the conduit to the back of the Bend is at the correct measurement.
Video 4
Have a look at this YouTube video about wiring a plug.
Summary
You will need to change your plug if you have a damaged plug head and / or exposed or faulty wires.
Remove the old plug head by releasing the central screw and remove the cap
Loosen the two bottom screws to release the clamp in the plug; don’t remove them fully.
Keep one of the screws connected to the clamp, remove the other screw and store it safely.
Releasing the cables: start by loosening the screws on the terminals. You can use the screw drivers to release the cables.
If the wires are damaged, cut off the old wires with the pliers.
Keep the information from the new plug (usually a piece of paper attached top the plug) for when you are ready to re-wire.
The new plug: Start by releasing the cap by undoing the central screw.
Release one of the screws from the cable clamp
If necessary, remove the outer sheath from the cable
Feed you cable into the plug head
All plug heads have internal marking to let you know which wire goes where.
Brown: goes to the live
Blue: goes to the neutral
Green and yellow: goes to the earth
Cut the internal cable to go to their terminal length
Use wire stripper to expose the copper wiring
Connect all the wire to their correct terminal and then put the plug back together