Installations and Connections
The VESI Installation Supply & Connection Test Procedures (ISCTP) define the principles, tests and procedures required to prove the correct polarity and neutral connection integrity to a customer’s electrical installation from the Distributor’s electricity network.
The VESI ISCTP Committee provides a forum for Victorian Electricity Distributors to manage and communicate the VESI Installation Supply & Connection Test Procedures and associated matters through:
- Development and maintenance of the procedures
- Formation and administration of Working Groups
- Providing availability and accessibility to the current procedures
The current version of the VESI ISCTP Manual dated January 2025 is now available for download below.
Committee Membership
| Network Operator | Representative | ||
|---|---|---|---|
| AusNet | Peter Mobbs (Chair) | ||
| CitiPower / Powercor | Anwar Qayyum | Chris Drake | Luke Bourne |
| Jemena | John Vasilopoulos | ||
| United Energy | Tony Martucci | ||
| EnergySafe Victoria | Barry Heywood | Brent Mathews | David Clarke |
| Registered Training Organisation | Gordon Hodges (ETD) | ||
| Service Providers | Brad Turner (Zinfra) | Jason Angel (Downer) |
Installation Supply & Connection Test downloads
 | Memorandum – VESI ISCTP Manual Update 2025 | Download |
| VESI ISCTP Manual 2025 | Download |
ISCTP Objectives
To ensure the safe connection of electrical installations to the Victorian Electricity Supply Network by:
- Providing correct polarity of electrical connections to the customer’s main switchboard
- Providing a supply neutral of less than 1 Ω impedance to the customer’s main switchboard
- Providing correct phase sequence to the customer’s metering equipment
- Adhering to safe work practices during the connection process
ISCTP Principles
- All conductive components, including enclosures and associated work area assumed to be de-energised shall be proven de-energised by test, prior to the commencement of work.
- Installation Under Test notice/s shall be placed at any point of which live apparatus is exposed to, or accessible by, other parties not involved in the connection process e.g. electricians, general public.
- All neutral conductors/connections shall be readily identifiable by colour or termination position and tagged where required.
- A Neutral Integrity Test Point (NITP) shall be established on the electrical installation to validate Check Testing and Neutral & Supply Testing Procedures.
- Polarity Testing shall be conducted on the Supply/Service conductors where the supply neutral conductor has been disturbed, connected or disconnected and reconnected.
- Supply Testing shall be conducted on the Supply/Service conductors where the service neutral conductor has been disturbed, connected or disconnected and reconnected.
- Check Testing shall be conducted:
- To ensure correct polarity of neutral connections to the main switchboard.
- With switching circuits energised to ensure correct polarity of neutral connections on any occasion where the connection work has involved the installation of new metering equipment or alterations or additions to existing metering equipment.
- A final Neutral and Supply Test shall be conducted to an established NITP.
- Phase sequence shall be established:
- On new installations to be correct to the metering equipment, and
- On existing installations in a manner to ensure the correct operation of 3 phase equipment.
- Installation or changes to Metering equipment to be checked for correct functionality.