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Evidence Guide: MEM10018 - Select cable types and sizes to suit loads and electrical installation environment

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

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MEM10018 - Select cable types and sizes to suit loads and electrical installation environment

What evidence can you provide to prove your understanding of each of the following citeria?

Determine job requirements

  1. Follow standard operating procedures (SOPs)
  2. Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures
  3. Use appropriate personal protective equipment (PPE) in accordance with SOPs
  4. Identify job requirements from specifications, drawings, job sheets or work instructions
Follow standard operating procedures (SOPs)

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use appropriate personal protective equipment (PPE) in accordance with SOPs

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify job requirements from specifications, drawings, job sheets or work instructions

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select wiring systems and cables for electrical installation work and equipment

  1. Select wiring systems to suit loads and electrical installation work environment
  2. Select cable conductor sizes based on current-carrying capacity, short circuit capacity, maximum demand, voltage drop and earth fault-loop impedance in accordance with regulatory requirements
  3. Select circuit protective devices based on current-carrying capacity requirements of the selected cables
  4. Select earthing system parts to meet the multiple earth neutral (MEN) system
  5. Document selection of cable types and sizes and installation requirements in accordance with SOPs
Select wiring systems to suit loads and electrical installation work environment

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select cable conductor sizes based on current-carrying capacity, short circuit capacity, maximum demand, voltage drop and earth fault-loop impedance in accordance with regulatory requirements

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select circuit protective devices based on current-carrying capacity requirements of the selected cables

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select earthing system parts to meet the multiple earth neutral (MEN) system

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Document selection of cable types and sizes and installation requirements in accordance with SOPs

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1.

Determine job requirements

1.1.

Follow standard operating procedures (SOPs)

1.2.

Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures

1.3.

Use appropriate personal protective equipment (PPE) in accordance with SOPs

1.4.

Identify job requirements from specifications, drawings, job sheets or work instructions

2.

Select wiring systems and cables for electrical installation work and equipment

2.1.

Select wiring systems to suit loads and electrical installation work environment

2.2.

Select cable conductor sizes based on current-carrying capacity, short circuit capacity, maximum demand, voltage drop and earth fault-loop impedance in accordance with regulatory requirements

2.3.

Select circuit protective devices based on current-carrying capacity requirements of the selected cables

2.4.

Select earthing system parts to meet the multiple earth neutral (MEN) system

2.5.

Document selection of cable types and sizes and installation requirements in accordance with SOPs

Required Skills and Knowledge

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1.

Determine job requirements

1.1.

Follow standard operating procedures (SOPs)

1.2.

Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures

1.3.

Use appropriate personal protective equipment (PPE) in accordance with SOPs

1.4.

Identify job requirements from specifications, drawings, job sheets or work instructions

2.

Select wiring systems and cables for electrical installation work and equipment

2.1.

Select wiring systems to suit loads and electrical installation work environment

2.2.

Select cable conductor sizes based on current-carrying capacity, short circuit capacity, maximum demand, voltage drop and earth fault-loop impedance in accordance with regulatory requirements

2.3.

Select circuit protective devices based on current-carrying capacity requirements of the selected cables

2.4.

Select earthing system parts to meet the multiple earth neutral (MEN) system

2.5.

Document selection of cable types and sizes and installation requirements in accordance with SOPs

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria on at least two (2) occasions and include:

following work instructions, standard operating procedures (SOPs) and safe work practices

identifying and interpreting circuits, drawings, plans and specifications relevant to the work to be undertaken

determining the cable routes, length and conditions in which the wiring system is to operate

complying with relevant Australian/New Zealand Wiring Rules, Cable Selection and Service Rules when selecting cables ensuring coordination between protective devices and conductors in regard to the following aspects:

design of the circuit taking into account the safety considerations

determining the final subcircuit arrangements

determining the factors affecting suitability of wiring systems

calculating the maximum demand on consumer mains/submains

calculating the current-carrying capacity requirements

calculating the voltage drop requirements

calculating the expected fault loop impedance

selecting cables to satisfy voltage drop, current-carrying capacity and fault loop impedance requirements

selecting the appropriate protection devices

selecting the appropriate isolation devices and switching arrangements

selecting earthing system parts to meet the multiple earthed neutral (MEN) system

documenting reasons for selection and installation requirements in accordance with SOPs.

Evidence required to demonstrate the required knowledge for this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include knowledge of:

safe work practices and procedures and use of personal protective equipment (PPE)

Australian/New Zealand Wiring Rules, AS/NZS 3008.1.1:2009 Electrical Installations – Selection of cables – Cables for alternating voltages up to and including 0.6/1 kV – typical Australian installation conditions and other related standards in regards to the following:

design and safety performance requirements, including:

protection of persons, livestock and property from harmful effects

correct functioning of the electrical installation for intended use

compatibility with the electricity distribution system, or other source of supply, to which the electrical installation is to be connected

type of insulation required:

thermoplastic

elastomer

cross-linked polyethylene (XLPE)

mineral-insulated metal sheath (MIMS)

high temperature

supply characteristics

reasons for dividing installations into circuits and factors that determine their number and type

external influences that may damage installation and be considered in the design, including applying derating factors caused by the effect of:

grouping of cables

ambient temperature

depth of laying

thermal resistivity of soil

varying of loads

thermal insulation

direct sunlight

acceptable methods of protection against risks of ignition of flammable materials

likely sources of unwanted voltages and methods of dealing with this potential hazard

requirements for protection against fault current

protection against harmful effects of faults between live parts of circuits supplied at different voltages

mechanical movement protection

fire rated construction and how integrity of fire rating can be maintained

final subcircuit arrangements, including:

factors to consider when determining the number and type of circuits required

daily and seasonal demand for lighting, power, heating and other loads in a given installation

factors affecting current-carrying capacity of cables

layout/schedule of circuits

factors affecting suitability of wiring systems

acceptable methods of determining maximum demand on an installation’s consumer’s mains and submains up to 400 A per phase

external factors that require the use of a derating factor when determining current-carrying capacity

requirements for maximum voltage drop in an installation and relevant tables for unit values of voltage drop

requirements for maximum fault loop impedance in an installation and the relevant tables to determine cable impedances

accepted methods used against indirect contact when selecting protection devices to protect against overload and short circuit current situations

provision of isolation of every circuit for a range of installations and conditions

earthing system parts including the selection of earth electrode, main earthing conductor, main earthing terminal/connection or bar, MEN link, protective earthing conductors and equipotential bonding

effects of harmonic current on current-carrying capacity

conditions where short circuit performance may need to be considered.

Range Statement

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.

Electrical installations include:

at least one (1) general electrical installations comprising a main switchboard, supplying more than one circuit each for lighting, socket outlets and fixed appliances

at least one (1) industrial electrical installation comprising a distribution board separate from the main switchboard and at least one (1) circuit supplying a three-phase load and safety system in one of the following industrial environments:

factory

building

off shore platform

mine site processing

oil and gas installation

processing plant

workshop

underground installation

three-phase loads include at least one (1) or more of the following:

motors – for pumps, conveyors, mills, agitators, crushers and screening plants

heaters

compressor packages

heating, ventilation and air conditioning (HVAC) units

facility accommodation units, sea container workshops and storage units, and laboratories

workshop equipment, including lathes, milling machines and welders

underground dewatering systems and ‘gate end’ boxes for drilling equipment

Regulatory requirements include:

AS/NZS 3000:2007 Electrical installations (known as the Australian/New Zealand Wiring Rules)

AS/NZS 3008.1.1:2009 Electrical Installations – Selection of cables – Cables for alternating voltages up to and including 0.6/1 kV – typical Australian installation conditions

Safe working practices include:

demonstration of safe working practices and installation in accordance with industry established safe and sound practices