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Glossary

Terms of reference

Customer Examples

Why do we need it?

Appointments and authorisations Letter from the developer appointing the designer as the designer of the subdivisions. See example here.

Bill of materials

The bill of materials is a TXT file based on the DDC manual created from Microstation or DQM CU EXPORT FACILITY and generated by the DQM/CAD Interface. Your bill of materials is to be provided for Design Conformance Review in accordance with Underground Distribution Schemes Manual Section 4.4.4.

CAD (Computer Assisted Design) site plan

Your CAD plan helps us better understand your work site and location of assets.  We extract data from your plan to assist us with your design. See example here

Civil NER certification

Civil NER certification verifies that the substation retaining walls are structurally sound and/or battered slopes are suitable for their purpose. This certification must be provided in accordance with the Underground Distribution Schemes Manual Section 5.3.18.

Concept plan, including stage timing

A concept plan provides us with a view of the subdivision, the scale of the project and nature of the proposed electrical network. Together with stage timing information, we can undertake planning assessments and produce a Design Information Package.

Design drawing

Design drawings are provided for Design Conformance Review in accordance with Underground Distribution Schemes Manual Section 4.4.4. The drawings must be geospatially correct by incorporation of Map Grid of Australia MGA94 grid system. Other design drawing requirements are in Appendix 4 of the Underground Distribution Schemes Manual.

Disturbing loads

The information allows us to check the impact of your loads on the network.  You must comply with Power Quality limits as per AS61000.3.6 and Western Power Technical Rules.

Draft design drawing

Draft design drawings provided with your application assist us to complete your Design Information Package.

Electrical NER certification

Electrical NER certification must be provided for a Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 4.4.4.  The certification template is available in Appendix 3 of the Underground Distribution Schemes Manual.

EPR assessment

EPR (Earth Potential Rise) must be assessed when a new HV earth is proposed. The assessment must be provided for a Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 5.3.20.

Equipment schedule

An equipment schedule allows us to notify the electricity retailer of the new/changed load of the UMS connection; and, check that the load does not exceed 4.8kW (20A) single phase.

High voltgage (HV) concept plan For greenfield subdivisions with a large number of stages, a comprehensive concept plan if provided at the time when the DIP for the 1st stage is requested, Western Power will be able to provide a DIP to cover all the stages. For any subsequent stage, the designer is still required to send a request with an updated concept plan, which also shows the design of previous stages. See example here.

Hydrology drawings and water table levels

Hydrology drawings and water table levels demonstrate flood event and water table levels in relation to above ground assets and transformer stability. Assets must be located above flood event levels. This information must be provided for a Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 5.3.3. See example here.

Lighting schedule

A lighting schedule allows us to understand the type and size of lights you require and check that we can provide them.

Load breakdown

Your load breakdown allows us to assess the impact your project will have on the network. It also allows us to apply the appropriate charging policy.


Indicative example:

Vertical Development
  Residential Commercial
Lot # Number of Dwellings DADMD*
3.1kVA per Dwelling
Floor space (sqm) Load Allocation**
75VA/sqm
1 150 465 1500 112.5
2 250 775 2000 150
3 100 310 1000 75
Total (kVA) 500 1550 4500 337.5 1887.5

* See the Residential DADMD Calculator for guidance.
** See AS/NZS 3000 Table C3 for guidance.

Local Government Authorisation

You will need to provide evidence in writing from your local government authority stating that you have their approval to conduct this work.

Location plan

A location plan shows your project site on a map within the surrounding area. See example here.

LV volt drop assessment

This assesses that the voltage drop, line currents and fuse protection are adequate for each circuit. The assessment must be provided for Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 4.4.4.

Neighbours authority

You must have authorisation from your neighbour if your project will impact their property.

Payment Guarantee for Design Information Package & Design Conformance Review fees

A payment guarantee gives us permission to deal with your design organisation, and is your agreement to pay the associated fees for the Design Information Package and Design Conformance Review if your project does not proceed.

Precal (DGN)

Your DGN precal file allows us to identify the stage boundary for your project and is used to produce your Design Information Package. For street light projects, your DGN file indicates intended light locations.

Single line diagram

The single line diagram provides us with the technical information to design a connection to meet your requirements. See example here.

Site photos

Site photos help us understand your current connection arrangements and more easily identify potential site specific issues. See example here.

Site plan

Site plans provide us with an understanding of your work site, the location of existing and new assets and help us to design your product. See example here

Specific purpose statement

A clear, specific purpose statement helps us understand what you need and why, your timeline and location details.

Statement of compliance to AS61000.3.6

Your accredited electrical contractor or consultant must submit a statement verifying that the installation complies with AS61000.3.6 and Western Power’s Technical Rules.

Streetlight authorisation letter

An authorisation letter from the local government is required to proceed with a project that includes decorative or private street lighting. This authorisation must be provided for Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 4.4.4

UMS load application

(Unmetered Supply)

View the UMS load guidelines for access to the application form and guidance on how to complete it.

Voltage fluctuation report

This report demonstrates that the voltage fluctuation occurring at your point of supply is within limits defined in SA/SNZ TS IEC 61000.3.5:2013  “Electromagnetic compatibility (EMC) Limits - limitation of voltage fluctuations and flicker in low voltage power supply systems for equipment with a rated current greater than 75 A”.  The report is to be provided for a Design Conformance Review in accordance with the Underground Distribution Schemes Manual Section 2.1.3.

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