Initial Verification Tests

Using a typical test board these videos explain & clearly demonstrate the Initial Verification Tests. They are presented in the order described in the IET’s Guidance Notes No.3

• Preparing for Testing including Safe Isolation.
• Dead Tests:
• Continuity of Protective Conductors.
• Continuity of Ring Circuits – the 3 steps.
• Insulation Resistance – both for the Installation & for Final Circuits
• Polarity – power circuits & lighting circuits inc ES lampholders.
• Live Tests:
• Ze measurement
• Zs measurements
• RCD Tests
• Prospective Fault Current.

Please note: The video in this section depict tests carried out on low voltage (230v) electrical equipment. These tests should not be attempted unless you are a suitably qualified and competent person or under the direct supervision of a suitably qualified and competent person.

Toolkit

A set of animated graphics videos which show in detail, ‘step by step’, how circuits & electrical system components operate plus Ring circuit theory.

• Installation overview: shows how final circuits are connected in parallel to each other
• Earthing:
• Earth Fault Loop for TT, TN-S and TN-C-S systems
• Parallel Earth paths through Bonding conductors
• Protective devices : the operating principle of Circuit Breakers, RCDs & HRC fuses
• Circuits:
• 2 way & intermediate switching; 3 pole fan isolator & Fluorescent lamp circuit
• Motor Starters : DoL inc Inch Control, Star – Delta & Autotransformer
• Heating control : Y Plan, S Plan & S Plan Plus circuits
• Theory: Ring circuit calculation

Fault Finding

The Fault Finding module uses a unique flowchart to analyse faults

• Initial Analysis – check the simplest possibility first.
• Symptom, Cause, Reason.
• Determine the Test method to use for Diagnosis
• Video demonstrating a method to Diagnose it.

Maths

• Fractions
• Algebra
• Geometry
• Exponents
• S.I Units