Meter Wiring Diagrams
Meter station installation
The supply, installation, maintenance and security of the meter station is the responsibility of the customer. Northpower will provide the metering and control equipment, unless alternative contractual arrangements are made in advance. Customers may provide their own check metering. However, the check meter must be clearly marked as ‘check meter only’.
Where multiple phases are supplied, the customer load should be spread as evenly as is practical across the available phases. In multiple meter installations, it is preferred the controlled meter is positioned to the right or below the uncontrolled meters. Each meter should be labelled with the appropriate tariff code. Each meter station will be clearly labelled with the Installation Control Point (ICP) or premise number provided by Northpower.
Combined meter stations in multi tenanted buildings must have each meter clearly labelled with the flat number or tenant area. Once the meter station is EGR (Electricity Governance Rule) certified, an EGR certification label is to be provided. Each installation must be able to be separately isolated at a point on the supply side of the meters. If a non metered supply is provided, a meter station will not be required. However, the installation must still be clearly labelled with the ICP or premise number.
Positioning the meter station on a residential property
All installations must be outside and positioned on the front of the building or structure facing the road or access way, or on the sides of the building immediately adjacent to the front. The meter station must be easily and directly accessible from the road or access way. There must be no fences, walls, obstructions, prickly plants, excessive vegetation, dangerous animals or other hazards that restrict access to the meter station. The meter enclosure shall be weather proof and secure from unauthorised entry and interference.
The meter station should be positioned to avoid direct sunlight, high ambient temperatures, excessive humidity, vibration, mechanical damage or interference from stock. The height of the meter displays should be between 1.4m and 1.75m above ground level and able to be easily read by a standing person.
However, if the meter station is liable to damage from stock the displays may be up to 2.1 metres above the ground. The meters shall be able to be read through a transparent window without having to open the enclosure. If there are hazards or entry restrictions on the property, the meter station should be installed on a suitable structure at an accessible location, e.g. the front boundary.
Positioning the meter station on a commercial or multi dwelling property
The meter station should be located outside (refer to residential requirements). However, it may be located inside the building if necessary for metering requirements or due to unavailability of a suitable outside location. Any inside meter station must be easily accessible during working hours. Access to the meter station should not pass through hazardous, restricted, or specified hygiene (e.g. food preparation) areas. The meters should be able to be easily read by a standing person. The meter station should also be secure and protected from damage. High rise or multi tenanted buildings should have all the meters located in a central area.
Positioning a replacement meter station
When replacing a meter station, it must be installed to meet the requirements of a new installation. The meter station must be accessible, and access to the meter station should not pass through hazardous areas. The meters should be secure and protected from damage. If the meters are inside, a key should be provided or arrangements for access made. Prepay meters can be used with the approval of the Electricity Retailer.
This table provides documents which give guidance on the wiring of meter stations for common situations. It does not cover high voltage metering.
Table of metering diagrams (without distributed generation)
- Single phase metering without controlled Phase
- Single phase metering with controlled Phase
- Installation with 2 or 3 ICP’s. 3 phase service and combined meter board.
- Installation with more than 3 ICP’s. Three phase service and combined meter board.
- 3 Phase supply with 2 uncontrolled phases and one controlled phase.
- 2 Phase supply with 2 uncontrolled phases and controlled Phase.
- 3 Phase supply with one controlled Phase.
- 3 Phase supply with 3 phase controlled Phases.
- Installation with up to 3 ICP’s. 3 phase and single phase ICPs with and without controlled phases.
- Standard connection for 230/400V, 3 phase 4 wire CT meter installation & test block.
- Single phase day/night dual tariff
- 3 phase day/night dual tariff (school special)
- Single phase temporary builders supply
- Single phase metering (pre paid controller “esmart”) without controlled phase
- Single phase metering (pre paid controller “esmart”) without controlled phase (ripple receiver)
- Single phase metering (pre paid controller “esmart”) with controlled phase (with pilot wire and contactor)
- Dual single phase metering with controlled phase
- Electrical Boundaries
Table of metering diagrams (with distributed generation)
- Single phase metering without controlled phase for distributed generation
- Single phase metering with controlled phase for distributed generation
- 3 Phase supply with 2 24-hour phases and one controller phase for distributed generation
- 2 Phase supply with 2 24-hour phases & one controlled phase for distributed generation
Typical equipment dimensions
|Equipment||Length (mm)||Width (mm)||Depth (mm)|
|Single phase meter – short terminal cover||170||120||120|
|Single phase meter – long terminal cover||220||120||120|
|3 phase whole current meter– short terminal cover||170||170||65|
|3 phase whole current meter– long terminal cover||245||170||65|
|3 phase CT meter– short terminal cover||220||150||75|
|3 phase CT meter– long terminal cover||260||150||75|
|Ripple Receiver (standard)||175||110||75|
|Ripple Receiver (narrow)||230||85||80|
|* Ripple Control Contractor||160||75||65|
|Esmart controller (owned by retailer)
Refer to Retailer for dimensions
- The diagrams apply only to Northpower owned metering equipment (includes ripple receiver contactor).
- Northpower will supply a controlled supply to a maximum rating 2A. If a load greater than 2A is controlled, eg spa pool, the customer is required to fit an auxilary contactor.
- Equipment and wiring must have adequate load and fault ratings.
- The colours used in the diagrams are to distinguish between different phases, neutral and earthing conductors. The colour of the wiring should comply with AS/NZS 3000 rather than the diagrams.
- Approval of non standard arrangements should be referred to Northpower’s Network Planning Department.
- These diagrams apply to new meter stations or meter stations that are being significantly upgraded. Excludes meter replacement. Note: where a ripple receiver or contactor is replaced on a planned basis, an HRC or MCB should be installed, if there is none.
- For controlled options refer to Northpower's tariff options.
CT: Current Transformer
HRC: High Rupture Current
ICP: Individual Connection Point
MCB: Miniature Circuit Breaker
RCD: Residual Current Device