I.S. 10101 / ET101 Wiring Rules study plan
I.S. 10101 / ET101 Wiring Rules · Give each week a clear focus.
8 weeks · About 7 hours per week
Protection for Safety: Electric Shock, Thermal Effects, Overcurrent and Surge
State the conditions for automatic disconnection of supply for TN-S, TN-C-S and TT systems, and calculate maximum permissible earth-fault loop impedance for a given protective device
Distinguish between basic protection and fault protection and list the measures used for each
Explain the role of RCDs (residual operating current, operating time) in supplementary and additional protection
Identify thermal effects requiring protection: overload, short circuit, and the adiabatic check for conductors
Your checkpoint
One-page reference sheet with disconnection times table, a worked Zs calculation for a 32 A Type B MCB, and a worked adiabatic check for a 2.5 mm² cable
Protection for Safety: Electric Shock, Thermal Effects, Overcurrent and Surge & Earthing Arrangements, Protective Conductors and Bonding
Size a circuit protective conductor using the adiabatic equation and the tabulated k values
Compare earthing system types (TN-S, TN-C-S, TT, IT) and state where each is permitted
Describe main protective bonding: which services require bonding, conductor sizing, and connection points
Explain the purpose of supplementary bonding and when it may be omitted in a location containing a bath or shower
Your checkpoint
Completed CPC sizing and main bonding conductor sizing worksheet for five sample circuits, with justification for each conductor size chosen
Selection and Erection of Wiring Systems, Cables and Conductors
Select cable current-carrying capacity by applying correction factors for ambient temperature, grouping and thermal insulation
Determine the appropriate protective device rating using the Iz ≥ In ≥ Ib design relationship
Choose wiring system types suitable for a given environment (buried, exposed to sunlight, in thermal insulation, in a void)
State the requirements for conductor identification, minimum cross-sectional areas and support of cables
Your checkpoint
Full cable-sizing calculation for a three-circuit domestic distribution board, showing Ib, In, correction factors, tabulated Iz and final selected cable size per circuit
General Characteristics and Assessment of General Characteristics
Describe the maximum demand assessment method and how diversity is applied to load calculations
List the characteristics to be assessed before an installation is designed (supply characteristics, nature of demand, environmental conditions, continuity of service)
Explain how protective device selection and conductor sizing interact with the assessed maximum demand
Identify the information that must be recorded about the supply and the installation's intended use
Your checkpoint
Maximum demand and diversity calculation for a mixed domestic/small commercial installation, with a written assessment of the general characteristics and a chosen main protective device rating
Switchgear, Controlgear, Isolation and Switching
Distinguish between isolation, switching for functional control, emergency switching and emergency stopping
State the requirements for a means of isolation for every circuit and for the main switch
Explain the locking-off and warning-notice requirements for isolation of equipment
Select appropriate switchgear for a given duty, including AC-23 utilisation category considerations for motor circuits
Your checkpoint
Annotated single-line diagram of a distribution board showing main switch, isolators, RCDs, MCBs and the function of each device, with a written justification of the switching arrangement
Special Installations and Locations (e.g. bathrooms, construction sites, agricultural)
Apply the zone rules and IP requirements for equipment in a room containing a bath or shower
State the additional protection and supplementary bonding requirements for bathroom and shower locations
List the additional requirements for construction and demolition site installations, including reduced-voltage and RCD protection
Describe the requirements for agricultural and horticultural premises, including fire risk and equipotential bonding of livestock areas
Your checkpoint
Zone diagram of a bathroom with equipment locations marked and a compliance checklist for each zone, plus a one-page comparison of construction-site versus agricultural additional requirements
Scope, Fundamental Principles and Definitions & Inspection, Testing, Verification and Certification
Define key terms from the standard: live part, exposed conductive part, extraneous conductive part, basic insulation, SELV, PELV, FELV
Sequence the inspection, testing and certification process from initial verification through to periodic inspection
Describe the tests required for initial verification and state the order in which they are carried out
Interpret test results against expected values and identify when a result indicates a defect
Your checkpoint
Completed initial verification test schedule for a sample installation with recorded results, expected values and a pass/fail judgement for each test
Inspection, Testing, Verification and Certification & Scope, Fundamental Principles and Definitions & Protection for Safety: Electric Shock, Thermal Effects, Overcurrent and Surge
Complete a full timed mock examination across all eight domains and score it
Identify the three weakest domains from the mock and re-work the underlying rules for each
Produce a condensed final revision sheet covering disconnection times, conductor sizing and testing sequence
Verify recall of definitions and scope items without reference to notes
Your checkpoint
Scored mock exam with a written error analysis listing each missed question, the correct rule, and the domain it belongs to
Milestones
Week 2: Can calculate Zs, CPC size and bonding conductor size for an unfamiliar circuit without notes, and explain the earthing system type from a supply description
Week 4: Can complete a full cable-sizing calculation end to end and justify the maximum demand figure used
Week 6: Can correctly place equipment in bathroom zones and list the additional requirements for at least two special locations
Week 8: Scores at least 75% on the timed mock exam with no domain below 60%, and has a written error analysis for every missed question