TECHNICAL STANDARD – TS-108
FOR DISTRIBUTION EQUIPMENT AND
TRANSFORMER ROOMS
Published: 3 September 2012
SA Power Networks.
www.sapowernetworks.com.au
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 1 of 32
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Copyright  2010
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
REVISION NOTICE:
EXPLANATION
Amendments to clauses 5.0, 6.3, 9.4, 9.5, 9.7.1, 9.8.1,
9.8.2.1, 9.8.2.2, 9.9, 9.9.1, 10.1 and 11.2
 Replaced Figure 1
Company name change only. No other content of this
Technical Standard has been altered. Any revision markings
are from the May 2012 edition.

May 2012
3 September 2012
SA Power Networks - SA Power Networks means Distribution Lessor Corporation
subject to a two hundred year lease to the partnership of companies trading as SA Power
Networks or SA Power Networks in its own right. SA Power Networks, ABN 13 332 330 749, a
partnership of:
Spark Infrastructure SA (No.1) Pty Ltd, ABN 54 091 142 380
Spark Infrastructure SA (No.2) Pty Ltd, ABN 19 091 143 038
Spark Infrastructure SA (No.3) Pty Ltd, ABN 50 091 142 362
each incorporated in Australia
CKI Utilities Development Limited, ABN 65 090 718 880
PAI Utilities Development Limited, ABN 82 090 718 951
each incorporated in The Bahamas
1 Anzac Highway, Keswick, South Australia, 5035.
SA Power Networks Disclaimer:
1. The use of the information contained in this Technical Standard is at your sole risk.
2. The Information in this Technical Standard is subject to change without notice.
3. SA Power Networks, its agents, instrumentalities, officers and employees:
a. Make no representations, express or implied, as to the accuracy of the information
contained in this Technical Standard;
b. Accept no liability for any use of the said information or reliance placed on it; and
c. Make no representations, either expressed or implied, as to the suitability of the said
information for any particular purpose.
4. SA Power Networks and its agencies and instrumentalities do not endorse or in any
respect warrant any third party products or services by virtue of any information,
material or content referred to or included on, or linked from or to this Technical
Standard.
SA Power Networks Copyright © 2012:
This publication is copyright. SA Power Networks reserves to itself all rights in such material.
You must not reproduce any content of this Technical Standard by any process without
first obtaining SA Power Networks permission, except as permitted under the Copyright Act
1968.
All rights reserved.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
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DATE
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
1.0
PURPOSE................................................................................. 6
2.0
SCOPE .................................................................................... 6
3.0
GRACE PERIOD ...................................................................... 7
4.0
REFERENCES ........................................................................... 7
5.0
DEFINITIONS ........................................................................... 9
6.0
DISTRIBUTION TRANSFORMER ROOM LOCATION ............... 12
6.1
SITE LOCATION .................................................................. 12
6.2
DISTRIBUTION TRANSFORMER ROOM LOCATION ....................... 12
6.3
DISTRIBUTION TRANSFORMER ROOM SIZE ................................ 13
7.0
LAND TENURE ....................................................................... 15
7.1
FORM OF TENURE ............................................................... 15
7.2
EASEMENT DOCUMENTATION PROVISIONS .............................. 15
7.2.1
Exclusively Enclosed Building Area for Housing T/F .... 15
7.2.2
Cables and other Physical Services ............................. 15
7.2.3
Ventilation ....................................................................... 15
7.2.4
Access by Personnel, Equipment and Vehicles .......... 15
7.3
THIRD PARTY LAND ............................................................. 16
7.4
LANDOWNER AGREEMENT ................................................... 16
7.5
COSTS ............................................................................. 16
8.0
ACCESS REQUIREMENTS ............................................................. 16
8.1
SLOPING GROUND CONDITIONS .......................................... 16
8.2
PERSONNEL SAFETY AND ACCESS ......................................... 17
8.3
EQUIPMENT ACCESS ........................................................... 17
8.3.1
Equipment and Personnel Doors ................................... 18
8.3.2
Personnel Doors with Stairs............................................. 18
8.3.3
Hatchway Type Entrances ............................................. 18
8.3.4
Safety Signs ..................................................................... 18
8.3.5
Hardware ......................................................................... 19
8.3.5.1
TS-108
Issue: 03/09/12
Access Route to the Distribution T/F Room .. 19
Authorised: Jehad Ali
Date: 03/09/12
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CONTENTS
8.4
HAZARDOUS LOCATIONS..................................................... 19
8.5
AVOIDANCE OF SERVICES AND ENCROACHMENTS ................... 19
8.6
NOISE .............................................................................. 19
9.0
CONSTRUCTION REQUIREMENTS ......................................... 20
9.1
GENERAL.......................................................................... 20
9.2
FOUNDATION REQUIREMENTS ............................................... 20
9.3
DRAINAGE AND WATERPROOFING ........................................ 21
9.3.1
Site Drainage ................................................................... 21
9.3.2
Area Drainage ................................................................ 21
9.3.3
Water Tightness ............................................................... 21
9.3.4
Methods ........................................................................... 21
9.4
WALLS AND CEILINGS ......................................................... 21
9.5
FLOORS ............................................................................ 21
9.6
VENTILATION ..................................................................... 22
9.7
9.8
9.9
9.6.1
Natural Ventilation .......................................................... 22
9.6.2
Forced Ventilation .......................................................... 23
9.6.3
Distribution T/F Space & Ventilation Requirements ...... 23
9.6.4
Special Requirements for Ventilation Ducts ................. 24
FIRE ................................................................................. 24
9.7.1
Fire Detection and Alarm Settings ................................. 24
9.7.2
Fire Fighting Systems....................................................... 24
9.7.3
Fire Segregations ............................................................ 24
CABLE SUPPORTS ............................................................... 25
9.8.1
General ............................................................................ 25
9.8.2
Approved Supports and Enclosures .............................. 25
9.8.2.1
Buried Conduit:............................................... 25
9.8.2.2
Supported/Enclosed Conduit ....................... 25
HAULING EYES .................................................................. 26
9.9.1
For Cables & Distribution Transformers .......................... 26
9.10
OIL CONTAINMENT ............................................................ 26
9.11
ADDITIONAL REQUIREMENTS................................................. 27
TS-108
Issue: 03/09/12
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Date: 03/09/12
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
PROVISION OF PERMANENT SUPPLY.................................... 28
10.1
INCOMING HIGH VOLTAGE SUPPLY....................................... 28
10.2
APPROVAL ....................................................................... 28
10.3
INSTALLATIONS .................................................................. 28
10.4
INSPECTIONS ..................................................................... 28
11.0
AGREEMENTS, APPROVALS AND CONSTRUCTION ............. 29
11.1
SAFETY AND CLEARANCES ................................................... 29
11.2
EARTHING REQUIREMENTS .................................................... 29
11.3
STANDARD DESIGNS ........................................................... 30
11.4
INSPECTIONS ..................................................................... 31
11.5
CERTIFICATES OF COMPLIANCE - CONSTRUCTION ................... 31
11.6
LIGHTING AND POWER WITHIN T/F ROOM ENCLOSURE .............. 32
11.6.1 Temporary (During Construction Stage) ....................... 32
11.6.2 Permanent ....................................................................... 32
12.0
TS-108
MAINTENANCE/REPAIR OF THE DIST. T/F ROOM ............................. 32
Issue: 03/09/12
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Date: 03/09/12
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10.0
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
PURPOSE
This Technical Standard specifies the standard distribution equipment and
distribution transformer room‟s location, land tenure, access, construction and
provision of permanent supply requirements for a new or upgraded installation
that will be a component of SA Power Networks distribution network.
It will assist SA Power Networks customers/landowners (i.e. the registered
proprietors of land) in the planning of a development once it is established that
a distribution equipment and distribution transformer room will be required
within the customers/ landowners‟ building or in a separate building on the
property in order to meet the electricity supply requirements.
Furthermore it will assist in clarifying the customers/landowners‟ responsibilities,
agreements, approvals, construction and certificate of compliance process.
This document also provides guidelines in carrying out duties in safe, reliable
and cost effective way with the activities associated with distribution
equipment and distribution transformer rooms.
2.0
SCOPE
The specification in this technical standard is applicable (but not limited) for the
distribution transformers which are nominally 33kV/0.4kV or 11kV/0.4kV and with
a capacity of 2000kVA or less. The construction of a distribution transformer
room is principally governed by the requirements of the “Electricity (General)
Regulations 1997”, other statutory authority requirements and the Building Code
of Australia.
Timely advice enables SA Power Networks to outline the distribution transformer
room and underground cable requirements, to assess the impact of the
development on the distribution system and to plan any associated work so
that supply can be made by the required date. The construction of the
distribution transformer room and compliance to the technical standard is the
customer/landowner‟s (i.e. the registered proprietors of land) responsibility.
For further assistance/information concerning this technical standard, please
contact the relevant SA Power Networks‟ Manager. This technical standard is
available at the SA Power Networks websites below:
 On Intranet (for Internal use):
1. Technical Standards Series
2. NICC Brochures Series
 On Internet (for External use):
1. Technical Standards Series
2. NICC Brochures Series
The use of this Technical Standard is subject to the conditions stated in
SA Power Networks disclaimer.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
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1.0
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
GRACE PERIOD
The maximum grace period acceptable by SA Power Networks for
implementing this Standard is 3 months from the date of publication. Any new
design submitted for a Single Customer installation must reflect this current
Standard immediately.
All projects that are not in receipt of “Specification Compliance” at the revised
date of issue for this technical standard will need to incorporate the latest
requirements. This is applicable to both the design and construction phases of
the project.
The validity period for a “Specification Compliance” is 60 days. On the expiry of
a “Specification Compliance”, any specification change without a
documented exemption must be incorporated into the design and
construction of SA Power Networks infrastructure.
4.0
REFERENCES
The following listed documents are for additional information. It is advisable to
refer to the current publications before implementing them. Other
documentation may be required on a project specific basis.
Essential Services Commission of South Australia (ESCOSA) Codes:
 SA Electricity Distribution Code (EDC)
Energy Networks Association (AUS) Publications:
 ENA NENS 03 - 2006 - National Guidelines for Safe Access to Electrical and
Mechanical Apparatus
 ENA NENS 04 - 2006 - National Guidelines for Safe Approach Distances to
Electrical and Mechanical Apparatus
South Australian Legislation:
This technical standard does not necessarily align with AS/NZS Standards
Australia Publications.
 SA Electricity Act 1996
 SA Electricity (General) Regulations 1997
 SA OHS&W Act 1986
 SA OHS&W Regulations 2010
Environment, Heritage and Native Vegetation Protection Acts:
 Environment Protection Act 1993
 Environment Protection Regulations 2009
 Aboriginal Heritage Act 1988
 Native Vegetation Act 1991
 Heritage Places Act 1993
 National Parks & Wildlife Act 1972
 Natural Resources Management Act 2004
The Building Code of Australia Publications:
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Date: 03/09/12
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3.0
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Department of Planning Transport & Infrastructure Publications:
 Application Form – for Road works & Closures on Roads
 Notification of Works Impacting DPTI Roads
 Specification for Excavation and Reinstatement of Road Pavements
Standards Australia Publications:
 AS/NZS 1158 - Lighting for Roads and Public Spaces Set
 AS1319 – Safety Signs for the occupational Environment
 AS 1345 - Identification of the Contents of Pipes, Conduits and Ducts
 AS 1668.2 - The Use of Ventilation and Air Conditioning in Buildings.
 AS 60038 - Standard Voltages
 AS/NZS 2032 - Installation of PVC pipe systems
 AS/NZS 2053 - Conduits and Fittings for Electrical Installations– Part 1 & 2 General Requirements
 AS 2067 - Substations and High Voltage Installations exceeding 1 kV A.C.
 AS/NZS 2648.1 - Underground Marking Tape - Non-Detectable Tape
 AS 2885.1 - Pipelines - Gas and Liquid Petroleum - Design and Construction
 AS/NZS 3000 - Electrical Installations (known as the AS/NZ Wiring Rules)
 AS/NZS 3500 (Set) - Plumbing and Drainage Set
 AS 3798 - Guidelines on earthworks for commercial and residential
developments
 AS/NZS 4645.3 - Gas Distribution Networks - Plastics Pipe Systems
 AS 4678 - Earth-Retaining Structures
 AS 4799 - Installation of Underground Utility Services and Pipelines within
Railway Boundaries
 AS/NZS ISO 31000 - Risk Management - Principles and Guidelines
 AS/NZS ISO 14001:2004 – Environmental Management System Standard
 AS/ACIF S009 - Installation requirements for customer cabling
SA Power Networks Documents:
The construction must comply with the latest issue of the following SA Power
Networks publications current at the time of commencement of the Works and
the following publications as determined by SA Power Networks from time to
time will be considered to be incorporated in, and form part of, this Technical
Standard.
 Service and Installation Rules
 Technical Standards
 NICC Brochures
 Relevant E-Drawing Series
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
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 BCA - Building Code of Australia, Class 2 to Class 9 Buildings, Sections F and E
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
DEFINITIONS
Agreement to Grant Easement - An agreement letter signed by the registered
proprietor of land agreeing to allow SA Power Networks to cross their property
with our equipment and that they will grant to SA Power Networks a formal
easement on completion of the works. See Appendix C for Standard letter for
use when the Customer is required to obtain the required agreement to grant
easement from the affected property owner, NOT SA Power Networks.
AS/NZS 3000 Wiring Rules - means the current version of the Wiring Rules
published by Standards Australia.
Authorised Person - the person in charge of the premises, or the registered
electrical worker or licensed electrical contractor or other person appointed or
selected by the person in charge of the premises, to perform certain duties
associated with the electrical installation on the premises.
Authorised Service Capacity - the demand capacity as detailed in the “Offer
for Supply” which was accepted by the customer. This is the maximum demand
capacity that the Service Protection Device, Consumers Terminals and
upstream Distribution System have been designed to provide for. When a
customer requests a reduction to their Agreed Maximum Demand the new
Agreed Maximum Demand will become the Authorised Service Capacity.
Connection Point - has the meaning given to that term in the Electricity
(General) Regulations 1997, namely a connection point to a transmission or
distribution network. For the purpose of this document connection point also
has the same meaning as Point of Supply as defined in AS/NZS 3000.
Consumers Mains - are the electrical cables/conductors, owned and
maintained by the customer, connecting the point of supply and the main
switchboard and form part of the customers/landowners‟ installation.
Consumer’s Terminals - the junction at which the consumer main connects to
the SA Power Networks service cable or main supply conductors.
CT Metering - a meter where electricity flow is measured by a meter using
current transformers (CT‟s). Note: CT meters are used where the maximum
demand of the installation is more than 100 amps.
Customer - has the meaning given to that term in the Electricity Act 1996,
namely a person who has a supply of electricity available from a transmission or
distribution network for consumption by that person and includes:
 The occupier for the time being of a place to which electricity is supplied;
 Where the context requires, a person seeking an electricity supply; and
 A person of a class declared by regulation to be customers/ landowners.
 Customer may or may not necessarily be the landowner.
Customer Agent/s - Customer agents are parties representing the customers.
Such parties may include registered electrical workers, licensed electrical
contractors, consulting engineers, architects, and equipment manufacturers.
Determined Maximum Demand - means the demand imposed on the
Distributor‟s supply system as assessed by the Responsible Officer.
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Date: 03/09/12
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5.0
Distribution Network - has the meaning given to that term in the Electricity Act
1996, namely the whole or a part of a system for the distribution of electricity,
but does not include anything declared by regulation not to be a distribution
network or part of a distribution network. For the purposes of these rules
references to Distribution Network means the network poles, wires, underground
cables, transformers, substations etc, operated by SA Power Networks, which
transports electricity from the transmission system to a customer‟s Connection
Point.
Distribution Transformer - A distribution transformer which forms a part of the
distribution network, typically with a secondary voltage of less than 1,000V A.C.
Distribution Transformer Enclosure - An open room adjacent to a
building/structure or a free standing building/structure, which does not have a
roof enclosed with a minimum of three walls, is considered as a Distribution
Transformer/Equipment Room.
Note: This type of transformer enclosure does not apply to residential
development where domestic style fencing encloses the transformer. For
details of requirements for these enclosures refer to SA Power Networks
document NICC-802.
Distribution Transformer Room - A room within a building/structure or a free
standing building/structure which has a roof enclosed within a minimum of
three walls and houses distribution transformer and/or distribution equipment.
Easement - The right to enter private property, to erect, or lay and maintain
infrastructure subject to any condition stated in the easement document.
Electricity Distribution Code - means the Electricity Distribution
administered by the Essential Services Commission of S.A.
Code
Electrical Installation - has the meaning given to that term in the Electricity Act
1996, namely a set of wires and associated fittings, equipment and accessories
installed in a place for the conveyance, control, measurement and/or use of
electricity that is, or is to be, or has been, supplied for consumption in the place,
but does not include:
 Electricity infrastructure owned or operated by an electricity entity; and
 Any wires, fittings, equipment or accessories connected to and beyond any
electrical outlet at which fixed wiring terminates (other than any such outlet
used to connect sections of fixed wiring).
SA Power Networks Manager - The SA Power Networks Manager or the
Authorised Officer serving that area of the customer‟s installation.
Fire Rating - For the purpose of this document the fire rating relates to the fire
resistance periods for structural adequacy, integrity and insulation.
High Voltage (HV) - For the purpose of this document, shall mean a voltage
exceeding 1,000V A.C. upto and including 33,000V A.C.
Landowner - The Landowner is the person or entity that is the registered
proprietor/owner of the land as recorded at the Lands Titles Office.
Must - is to be understood as mandatory.
Occupancy - means an electrical installation or part thereof, which is supplied
with electricity through a specific meter or meters and for which an individual
electricity consumption account is rendered.
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Authorised: Jehad Ali
Date: 03/09/12
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Offer Letter - means a letter documenting an offer by SA Power Networks to a
customer in relation to a contract to undertake and complete works for the
supply of electricity.
Point of Supply - Refer to Connection Point.
Property - For the purpose of this document “Property” means land on which
the single electricity customer or controlling body or their representatives have
the right to install their electrical installation.
A property may include:
 A single parcel of freehold, leasehold and/or public land, and/or land held
under lease or licence on which the customer or controlling body has the
right to install their electrical installation;
 Any combination of contiguous land to which the customer or controlling
body has the right to install their electrical installation; and
 Contiguous land and/or individual titles to which a corporate body,
customer and or controlling body has the right to install their electrical
installation.
Public Land - has the meaning given to that term in the Electricity Act 1996,
namely land owned by the Crown or an instrumentality or agent of the Crown
or by a council or other local government body, including any such land that is
subject to native title.
Requested Maximum Demand - the maximum demand that the Customer or
their agent have requested to be provided (as determined under AS/NZS3000
or by other method).
Retailer - a holder of a licence under the South Australian Electricity Act, 1996
authorised to retail electricity.
Service Point - Refer to Connection Point.
Service Protection Device - a device provided by SA Power Networks, generally
a fuse but may be a circuit breaker for larger installations, to protect SA Power
Networks assets.
Shall - is to be understood as mandatory.
Should - is to be understood as non–mandatory, i.e. advisory or recommended.
Underground Service - The electricity distributors supply network to the point of
supply.
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Date: 03/09/12
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
DISTRIBUTION TRANSFORMER ROOM LOCATION
6.1
Site Location
Most distribution transformer sites are likely to include a Padmount
transformer and associated switchgear / ring main units. Some sites
may require multiple Padmount transformers and ring main units
depending on the total required maximum demand.
SA Power Networks preference is for Padmount transformers and
associated switchgear to be located outdoors at ground level with
direct access from the street. This is the customer‟s least overall cost
option. Refer to NICC-802 - Padmounted T/F Brochure. However, an
alternative to the outdoor option is a distribution transformer room
within the customer‟s building.
6.2
Distribution Transformer Room Location
A distribution transformer room located within a building must take into
consideration:
 Ability for SA Power Networks to replace major plant (e.g. Padmount
Transformer) under emergency conditions,
 Impact on the areas adjacent to, above and below the distribution
transformer room,
 Future access to the distribution transformer room,
 Taking into account the surrounding environment,
 SA Power Networks 24/7 access requirement,
 SA Power Networks exits under emergency situations,
 The distribution transformer room is placed within the building
complex so that at least two walls which include personnel and
equipment doors are adjacent to open areas to provide an
emergency escape,
 Ventilation and room cooling facilities,
 Equipment installation methods, and
 All other SA Power Networks access requirements have been met.
We strongly recommend that you liaise with the relevant SA Power
Networks Manager when selecting a site within your development for
the distribution transformer room. Distribution transformer rooms located
at ground level with direct access and ventilation is SA Power Networks
preference for a distribution transformer room.
Alternatively, distribution transformer rooms may be located in the
following locations by agreement from the relevant SA Power Networks
Manager:
 Basement level;
 Upper level - by negotiation at gantry level for temporary HV supply
only.
TS-108
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Date: 03/09/12
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6.0
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
there is a duct system between associated equipment to enable
the installation of the required SA Power Networks cables.
2. SA Power Networks will not accept basement distribution
transformer rooms where they are located at the lowest point of the
building or below the flood level.
6.3
Distribution Transformer Room Size
For a single unit distribution transformer room the minimum distribution
transformer room size shall be not less than 6.25m (D) x 4.25m (W) x 4.0m
(H) which is based on distribution transformer capacity 2000kVA.
For any distribution transformer sizes less than 2000kVA, this minimum
distribution transformer room size shall be maintained for the future
expansion and/or upgrades.
Where 3 hour fire rating of the room is achieved then a minimum of
1.0m clearance, measured from inside wall(s) of the room to the
distribution transformer and/or equipment, shall be maintained.
Refer to figure 1 “Typical Distribution Transformer Room Size”.
For installations requiring multiple units (e.g. switch gear and/or
additional distribution transformer); the distribution transformer room size
shall be negotiated with the relevant SA Power Networks Manager
which is subject to supply requirements.
Also, a minimum of 1.0m clearance shall be maintained between each
unit in a multiple unit distribution transformer room.
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Date: 03/09/12
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Notes:
1. Basement distribution transformer rooms are only acceptable if
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Figure 1 - Typical Distribution Transformer Room Size
6.25m (D) min. x 4.25m (W) min. x 4.0m (H)
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
LAND TENURE
Formal land tenure (by registration in the Lands Titles Registration Office) must
be provided to SA Power Networks for the distribution transformer room,
together with rights of access for personnel, related services and where
necessary, vehicles.
7.1
Form of Tenure
Generally, registered easements (in a form determined by SA Power
Networks) will be adequate but in some circumstances, where the
facility has wider implications for the electricity distribution network,
tenure by ownership may be sought.
In those instances where ownership is deemed necessary, SA Power
Networks will negotiate arrangements separate to those set out in this
Technical Standard.
7.2
Easement Documentation Provisions
7.2.1
Exclusively Enclosed Building Area for Housing T/F
The area to be occupied by the distribution transformer will
need to be dedicated as an exclusive use distribution
transformer room, to avoid the risk of injury to third parties
accessing the site.
The easement documentation will also set out the rights and
obligations in relation to the building fabric, including (but not
limited to) doorways and security.
7.2.2
Cables and other Physical Services
This may include (but not be limited to) cables for the
conducting of electricity (both high and low voltage),
telecommunications, pipes for water and air, fire services,
ancillary fixings, infrastructure and works.
7.2.3
Ventilation
As set out in clause 9.6 of this Technical Standard, the facility will
require adequate ventilation (and possibly external ventilation)
and the easement documentation will make provision for this.
7.2.4
Access by Personnel, Equipment and Vehicles
The easement documentation will include (but not be limited
to) formal provision for the movement of personnel on an
unrestricted 24/7 basis (and in a way which ensures
compliance with the Building Code).
In addition, the easement documentation must make provision
for full access for plant and equipment installation,
maintenance and practical replacement.
Further, provision will be required for vehicle parking to enable
periodic maintenance and for larger plant e.g. cranes for
distribution
transformer
replacement,
and
in
some
circumstances, temporary installation of rails.
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7.0
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Third Party Land
It may be necessary for the electricity distribution network to cross third
party land to supply the distribution transformer facility. In this case it will
be necessary to obtain the formal agreement of impacted landowners
to also grant easements on terms and conditions acceptable to SA
Power Networks.
It will be the responsibility of the landowner of the proposed distribution
transformer facility land to negotiate this agreement.
7.4
Landowner Agreement
The owner of the land (not a tenant or informal third party
representative) must formally agree to grant an easement on such
terms and conditions as SA Power Networks considers appropriate and
undertake to do all things necessary to obtain registration of the
easement in the Lands Titles Registration Office.
The landowner must also provide a plan delineating the easement and
do all things necessary to enable deposit/acceptance of the plan in
the Lands Titles Registration Office.
7.5
Costs
The owner of the land must agree to pay all reasonable costs
associated with the granting of the easements (including those
required over any third party land).
The easement will also require that the landowner meet the costs of
any equipment (including but not limited to cranes and forklifts)
required for installation and replacement of the subject electricity
infrastructure due to its location as requested by the landowner, rather
than a location deemed by SA POWER NETWORKS to be more
convenient and accessible.
8.0
Access Requirements
Unless access to the distribution transformer room is directly from any street
frontage, the following requirements shall be met by the customer.
8.1
Sloping Ground Conditions
A level area is to be provided in front of the equipment door(s). Access
to the equipment door(s) position is necessary for vehicles. This should
be taken into account in determining the distribution transformer room
floor level.
When requested on the layout drawing, the customer must supply and
install suitable hand railing and guard rails in accordance with the
Building Code of Australia.
Where the site is cut into a slope, provision must be made for retention
of the bank and diversion of the surface water from the distribution
transformer room.
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7.3
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Personnel Safety and Access
SA Power Networks personnel require unhindered twenty four hour,
seven day per week access to the distribution transformer room and
associated mains at all times from the date of handover. The customer
is to provide access details such as keys, key codes etc prior to
connection of supply and SA Power Networks is to be informed should
access alter.
Unhindered vehicle access may be required by SA Power Networks for
emergency situations and maintenance purposes. Access points must
be located where they will not be obstructed by vehicles, equipment,
site usage or any other impediments.
Unrestricted access, without notice, by SA Power Networks personnel to
the distribution transformer room must be available at all times. The
requirement must be included in any immediate or future building
security arrangements. The imposing of restrictions on SA Power
Networks personnel access such as obtaining of approval or arranging
access through the building owner, tenant, building security („off or on
site‟) or other sources is not acceptable.
A permanent all-weather pedestrian access route at least 1.2m in width
is required to the distribution transformer room entrances. This must be
available for use by personnel at all times of the day and night 24/7
using only the SA Power Networks master key system as outlined in
Clause 4.7 of the SA Power Networks Service & Installation Rules. It is not
acceptable for access to be through areas which are hazardous.
The customer must not enter the distribution transformer room unless
accompanied by an appropriately accredited SA Power Networks
employee. The customer is required to ensure that each distribution
transformer room provides personal access from a minimum of 2
independent doorways which can provide an escape in the event of
an emergency.
It is essential that all access ways to the distribution transformer room be
kept clear at all times. Storage and car park bays are not acceptable
in front of distribution transformer room doors. SA Power Networks may
require suitable notices to be erected to this effect. Personnel
hatchways and vertical ladders as an access or escape means must
not be used.
8.3
Equipment Access
The distribution transformer room requires suitable access to a clear
equipment handling area in front of the room. This equipment handling
area is to be large enough to manoeuvre all required equipment in to
and out of the room with a minimum width of 2.6m and length of 2.6m.
The grade of the handling area should not exceed 1:20. A 6.2m turning
circle is required for the mobile crane to navigate around corners. A
carriageway easement of 4.5m (H) x 4.5m (W) is required for the
installation or removal of the distribution transformer. The width should
be increased on bends.
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8.2
The carriageway must have a maximum slope of 1:12. The carriageway
must be able to withstand the combined weight of the distribution
transformer and crane of 23 tonnes.
8.3.1
Equipment and Personnel Doors
All doors and frames shall be 3 hours fire rated with approved
underwriters label and have all the necessary attachments for
self closing. Hinges shall be fitted with stainless steel pins.
The locking cylinders will be changed to fit SA Power Networks
key when the distribution transformer room is taken over by SA
Power Networks.
The doors are to be opened outwards and indicated on your
layout drawings. No air space larger than 15mm is allowed
between frame and wall, door and frame and door to door.
Any single stage ventilation opening adjacent to any door lock
must be fitted with a suitable barrier to prevent unauthorized
opening of the door lock.
External doors shall be waterproof, and in the case of mild steel
construction, two coats of exterior gloss paint shall be applied.
Personnel access doors must be not less than 800mm (W) and
Equipment door size shall be 4.0m (H) x 4.0m (W).
8.3.2
Personnel Doors with Stairs
Stairways must be large enough to allow for the passage of
personnel and minor equipment. They must be no less than
1.2m wide and fitted with appropriate handrails. Headroom
must be a minimum of 2.2m.
Stairways and passageways must be provided with lighting.
Access doors should be fitted with micro-switches to
automatically activate the stairway and/or passageway
lighting.
8.3.3
Hatchway Type Entrances
Hatchway type entrances for equipment access used with
basement distribution
transformer
room designs
are
acceptable only if two (2) separate personnel access doors, via
stairs, external to the distribution transformer room are provided.
They are required to be of a standard design and the
necessary hatch cover and frame assembly must be supplied
and installed by the customer.
The area above the equipment hatchway must not be less
than 4.0m in height to allow for the use of a crane.
8.3.4
Safety Signs
Safety signs that draw attention to the dangers of unauthorised
access to high voltage electrical equipment must be attached
to all doors to the distribution transformer room.
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
8.3.5
Hardware
8.3.5.1
Access Route to the Distribution T/F Room
Where access to the distribution transformer room is
not direct from the street, locked doors or gates on
route to the distribution transformer room shall be
fitted with either:
 A lock with a cylinder keyed to the SA Power
Networks Master Key System.
 A padbolt or similar fixing capable of accepting
„Lockwood‟ series padlocks and keyed to the SA
Power Networks Master Key System.
 You are responsible for supplying and installing
doors fitted with Australian Locksmiths P1 Dead
latch, incorporating a heavy duty key-n-knob lock
with rigid outside knob, key retracting bolt and
free inside lever at all times.
8.4
Hazardous Locations
SA Power Networks distribution transformer room access routes must not
be within an area which is classified as a Hazardous Area.
8.5
Avoidance of Services and Encroachments
The distribution transformer room enclosure must be free of
encroachments into the required floor and trench areas. Columns,
beams, footpads and walls may occupy certain areas specifically
shown on the distribution transformer room plans, providing it does not
interfere with the location of consumer mains, conduits, trenches,
ventilation ducts and distribution transformer room equipment.
Please ensure that the location of the distribution transformer room
does not allow services such as drains, sewers and piping to pass
through the:
 Distribution transformer room space, Access passageways,
 Ventilation ducts, Distribution transformer room walls,
 Distribution transformer room floors, Distribution transformer room
ceiling.
The space next to all distribution transformer room access doors must
be kept clear at all times. Customer‟s equipment such as Mains Switch
Board (MSB) and Metering Equipment must not be installed within the
distribution transformer room.
8.6
Noise
The Environmental Protection Authority (EPA), local councils and other
authorities have the power to ensure that noise originating from any
premises is not the cause of reasonable complaint.
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These signs are to be in accordance with the requirements of
AS1319 – “Safety Signs for the Occupational Environment”.
The customer is responsible for the design and construction of the
distribution transformer room to ensure that noise does not exceed the
limits defined in Environmental Protection (Noise) Policy 2007 and is not
a source of complaint. Furthermore the use of surrounding areas will
impact on the level of noise that is permissible. Noise measurements
shall be as per AS2374.
Ventilation fans also are a source of noise and need to be silenced by
attenuator attachments and baffles. Fans installed in distribution
transformer rooms must not exceed the db(A) requirements as
specified in the Environmental Protection (Noise) Policy 2007.
The attenuator attachment can protrude substantially within the
distribution transformer room. However, as a result the dimensions of the
distribution transformer room may need to be increased. Size and
position of fans within the distribution transformer room must be
acceptable to SA Power Networks.
9.0
CONSTRUCTION REQUIREMENTS
All construction drawings for distribution transformer rooms are to be designed
to comply with the relevant clauses of the Building Code of Australia and
relevant Standards.
9.1
General
All construction materials used in the distribution transformer room
including walls, ceilings and floors, doors and vents must be
constructed from non-combustible materials.
Any wall, ceiling or floor shared with or adjoining another part of the
building must be treated as a fire wall as defined in the Electrical Safety
(Network Asset) Regulations 1999 and Building Code of Australia and
must have a minimum fire rating of 3 hours (180/180/180), effectively
segregating the distribution transformer room from the rest of the
building.
It is essential that these ratings be maintained for any penetration of the
wall for cables or other services. The sealing of the penetration must be
done strictly in accordance with the manufacturer‟s instructions and will
be subject to inspection by SA Power Networks.
9.2
Foundation Requirements
The distribution transformer room must be constructed on a stable
foundation which bears on soil or another part of a building. Where the
foundation bears on soil, the soil must be clear of any obstruction or
rubble which could interfere with the installation of the earthing
electrode system through the distribution transformer room floor.
All distribution transformers and HV switchgear must have a vault no
lower than the building basement with a minimum size of 1.2m deep x
0.9m wide x 1.8m long and sleeved appropriately for earthing
requirements OR the customer is to provide a distribution transformer
stand to SA Power Networks specification. For the site specific footings
and vaults requirements, consult/discuss with relevant SA Power
Networks Manager.
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Drainage and Waterproofing
9.3.1
Site Drainage
The site shall be effectively drained to keep the area outside
the distribution transformer room freely drained and dry.
Stormwater drainage systems shall be designed and provided
to industry best-practice standards. Site drainage shall be kept
in working order by the customer.
9.3.2
Area Drainage
The area in which the distribution transformer room is to be
located shall be free of the risk of flooding and storm water
damage and any drains provided must be kept in working
order by the owner.
Where there is potential for water ingress, the distribution
transformer Room is to be fitted with a level actuated sump
pump/s installed at the lowest point which can be utilised to
achieve suitable drainage or the removal of oil, in accordance
with EPA standards.
9.3.3
Water Tightness
The enclosure housing the distribution transformer room
equipment has to be watertight to protect all equipment within
the distribution transformer room which may be subject to risk of
damage from exposure to water or dampness.
SA Power Networks will not accept handover of the enclosure
or install equipment if there is water or water leakage within the
distribution transformer room or the potential for this.
9.3.4
Methods
Industry best practice construction methods shall be used at all
times to ensure the distribution transformer room is waterproof.
9.4
Walls and Ceilings
The distribution transformer room walls shall have sufficient structural
strength to support the weight of any equipment mounted on it without
collapsing. For the installation of a wall mounted hauling eye refer to
clause 9.9.
The ceiling shall be constructed of a suitable material that provides
sufficient structural strength for the mounting of hauling eyes. All
materials used shall meet the appropriate Australian standards.
9.5
Floors
The distribution transformer room floor, including trenches, conduits, etc,
is to be formed in accordance with the positions and details shown on
SA Power Networks drawings and specifications.
The floor shall be designed in accordance with the relevant AS/NZS
standards by a practicing structural engineer and be capable of
carrying both the static and working loads of the distribution
transformer room equipment with an additional safety factor for future
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9.3
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
In addition, the floor must have a level non-slip finish. Refer to clause 9.9
on the specific requirements for the floor mounted hauling eyes.
A distribution transformer landing area is to be provided in all cases. The
distribution transformer loading area is to be constructed of reinforced
concrete and must have the same load bearing characteristics as the
distribution transformer room floor. The equipment handling area is
specified in clause 7.3 and will be located immediately in front of the
distribution transformer access door/s.
The landing area must be at the same relative level as the distribution
transformer room floor to allow equipment to be rolled into the
distribution transformer room directly from the landing area.
9.6
Ventilation
Distribution transformer rooms require special attention to ventilation in
order to dissipate heat losses from electrical equipment. Wherever
possible, natural air flow to the outside of the building will be used.
Forced ventilation should be used where natural ventilation is not
practicable. Forced ventilation by means of fan(s) must be designed,
supplied and installed by the customer to SA Power Networks
requirements.
In either case, the ventilation must be sufficient to maintain a maximum
temperature rise of 15 degrees Celsius above the external ambient
temperature when all distribution transformers are operating at
nameplate rating. Air inlets and outlets must be arranged to achieve
an even distribution of air flow over the distribution transformers.
Substantial vertical separation is required between inlet and outlet
openings. Inlet and outlet openings should preferably be clear of
pedestrian areas and must be located to prevent entry of noxious
gases such as vehicle exhausts, fuel exhausts, refrigeration plant gas
discharge valves, pollutants such as smoke, soot, dust, ash etc.
Air being removed from an internal distribution transformer room must
be directly and independently ducted to outside air. A fire damper is
required to be installed in each duct-opening in a basement
distribution transformer room to close off air supply in the event of a fire.
It must have a fire rating of three hours (180/180/180).
In special circumstances, the customer may be required to install an
exhaust fan with integral fire damper as part of the building work.
Exhaust air from the distribution transformer room shall be ducted
independently and directly to outside air.
Note: As a guide heat losses are taken as 25kW per distribution
transformer.
9.6.1
Natural Ventilation
This type of ventilation is suitable for distribution transformer
room capacity up to 1000kVA. The position of the vents must be
directly to outside air, if this is not achievable, such as in the
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additional equipment and replacement equipment that may be
heavier.
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
The design calls for the customer to provide vermin proof,
weather proof louvered vents of a specified design in the walls
in order to achieve natural ventilation. Vents on personnel and
equipment doors are not acceptable. These areas outside the
louvers must not be subjected to fire risk.
In some cases, where the roof of the distribution transformer
room is external, weatherproof roof ventilators may also be
specified. It is important where roof vents are installed that they
are fixed securely to the rod purloins. All vents are to be fitted
with fire shutters.
9.6.2
Forced Ventilation
Ventilation system comprising fans, ducting and inlet\outlet
vents must be designed, supplied and installed by the
customer.
The air flow through the ventilation will be checked by SA
Power Networks before final approval. The control devices and
wiring for the starting and stopping of the fan(s) will be supplied
and installed by the Customer.
It is SA Power Networks requirement that the forced ventilation
system be designed so that the cool inlet air is drawn through
the circulation fan and then blown over the distribution
transformers.
In all circumstances the fans must be installed inside the
distribution transformer room and all wiring contained within the
distribution transformer room. The outlet ventilation shall be
discharged independently and directly to open air.
All vents are to be fitted with fire shutters. Fans installed in
distribution transformer rooms must not exceed the db (A)
requirements as specified in the Environmental Protection
(Noise) Policy 2007.
9.6.3
Distribution T/F Space & Ventilation Requirements
Distribution transformer rooms must provide sufficient space and
ventilation to accommodate 2000kVA distribution transformers,
ensuring sufficient ventilation are provided for future loads,
even through smaller units may be initially installed.
Distribution transformers must be separated from walls,
ventilation equipment and other obstructions by a minimum of
1.0m. Distribution transformers must not be directly placed
under ventilation duct openings.
With the exception of fire damper trip wires, if required, no item
of equipment or installation or obstruction is to be placed over
a designated distribution transformer space.
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case of a basement type distribution transformer room, then
forced ventilation is required.
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Special Requirements for Ventilation Ducts
Distribution transformer room ventilation ducts must not contain
other services, give access to other portions of the building or
form part of the ventilation system for the building.
The strength and fire rating of the walls of ventilation ducts are
required to be the same as those specified for the distribution
transformer room walls where fire dampers are not installed.
Normal air conditioning duct construction is acceptable only
where fire dampers are installed on wall penetrations where
ventilation ducts enter or leave the distribution transformer
room.
9.7
Fire
SA Power Networks distribution transformer rooms are designed to
contain any products of a fire within the enclosure. Self containment
has the added advantage of also being self smothering and this
ensures that there is no spread of fire to other parts of the building.
You must ensure all walls, floors, ceilings and doors are 3-hour fire rated
(180/180/180). The customer will be responsible for providing these fire
ratings at his cost.
9.7.1
Fire Detection and Alarm Settings
The customer is responsible for the installation and ongoing
maintenance of a compliant fire detection system which must
be installed and tested prior to commissioning of SA Power
Networks equipment.
The installation of such systems must ensure that the 3 hour fire
rating (180/180/180) of the distribution transformer room is not
compromised.
The testing and maintenance of the fire detection system will
require a Request for Network Access (i.e. RNA) permit. For RNA
procedure, refer to SA Power Networks website.
9.7.2
Fire Fighting Systems
SA Power Networks will not permit the installation of any type of
fire fighting systems within the distribution transformer room.
9.7.3
Fire Segregations
Where a distribution transformer room is located within a
building, a 3 hour fire rated (180/180/180) enclosure and a fire
rating level in accordance with the Building Code of Australia
must be provided.
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9.6.4
9.8
Cable Supports
9.8.1
General
All electrical conduits and cable enclosures, between the
distribution transformer room and the property boundary shall
be provide by the customer as specified on the layout drawings
to enable SA Power Networks to install HV and LV cables to the
distribution transformer room.
The location of the distribution transformer room should be such
that the length of conduits or other cable enclosures is as short
as possible. Conduits and other cable enclosures should run in a
horizontal straight line from the distribution transformer room to
the property boundary.
Where the distribution transformer room cannot be located at
street level or there are obstructions on the customer‟s property
which necessitate bends in the cable run the details of these
bends shall be discussed with and approved by SA Power
Networks Manager.
Any conduit bends shall have a minimum radius of 1.8m.
SA Power Networks will specify the number, size, type and
location of conduits, pits, cable trays etc. to be installed on the
customer‟s property.
All conduits are to be installed free of obstructions or any
material that may hinder or damage the cable during the
cable pull.
9.8.2
Approved Supports and Enclosures
The following are SA Power Networks approved methods of
supporting or enclosing HV or LV cables to a distribution
transformer rooms.
9.8.2.1
Buried Conduit:
The approved conduits, conduit bends sizes, stock
item
numbers,
installation
arrangements,
requirements, including minimum cover and
separations to other services are detailed in SA
Power Networks TS-085: “Trenching and Conduit for
Underground Distribution Cable Networks.”
9.8.2.2
Supported/Enclosed Conduit
(Basement Car Park)
There are various acceptable methods of encasing
conduits through buildings on route to the distribution
transformer room from the property boundary.
Consult with the relevant SA Power Networks project
officer for agreed method.
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Conduits must be securely fixed to prevent
movement when cable hauling forces are applied,
and to support the weight of the cables.
Furthermore, the installation must comply with the
relevant fire protection regulations where required.
Where HV cable easements are accessible to the
public the conduits must be labelled with “SA Power
Networks Cables” in permanent black lettering every
4.0m along their length.
9.9
Hauling Eyes
Where required, anchors and/or hauling eyes (provided by the owner)
are to be installed in the floor, walls or ceiling in the position shown on
the project specific layout drawings and in a manner to achieve the
working load specified.
The location and number of hauling eyes shall be negotiated with the
relevant SA Power Networks project officer.
All anchors and hauling eyes shall be clearly and permanently stamped
to indicate its safe working load. Hauling eyes located in floors shall be
removable and, upon removal, the floor surface shall be level to avoid
a tripping hazard. Threaded recesses shall be provided with reusable
removable plugs to exclude ingress of foreign matter.
Normal hauling eye requirements are as follows:
9.9.1
For Cables & Distribution Transformers
A single hauling eye cast into the floor of the distribution
transformer room shall be provided at the location shown on
the project specific layout drawings. The hauling eye must have
a minimum working load of 100 kN (i.e. 10 Tons) with a 50 kN
(i.e. 5 Tons) load applied in any direction and a minimum eye
bolt hole diameter of 40mm.
Hauling eyes may also be specified for intermediate cable pits
outside the distribution transformer room where these are
required on the owner‟s property.
9.10
Oil Containment
Provision must be made within the distribution transformer room to
contain any oil spillage (in the unlikely event of a distribution transformer
tank failure) and slope to a common point.
Spillage from distribution transformers needs to be contained within the
distribution transformer room and be 110% of oil volume as per the
AS1940 and EPA Bunding Guidelines. Bunding requirements may be
relaxed should a 100% self oil contained distribution transformers be
utilised.
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TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Additional Requirements
Additional requirements are as follows:
 Protection of vulnerable portions of the customer‟s premises from
damage which may occur in the event of failure of an oil-filled
distribution transformer.
 This means that the walls, ceilings and any ventilation ducts must
have an adequate degree of strength and, where they are the
means of separation from the interior of a building, a fire-rating of at
least 3 hours.
 The use of a „spray on‟ material to achieve fire rating will not be
permitted within the distribution transformer room.
 Protection of distribution transformer room equipment and mains
from fire and water sources originating outside the distribution
transformer room.
 High reliability in the precautions taken to ensure dry wall and floor
conditions.
 Oil Containment as per the EPA Guidelines and AS1940.
 High reliability in the drainage precautions.
 Suitability of the floor to support heavy equipment and of walls and
ceilings to support equipment requiring heavy-duty fixings.
 Suitability of the floor, walls, ceiling and roof materials, joints and
construction methods to provide a reliable watertight construction.
 Suitable proofing of the distribution transformer room against the
entry of vermin and vandals and unauthorized personnel.
 Prevention against the entry of fumes and other gases in basement
distribution transformer rooms.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 27 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
9.11
10.0 PROVISION OF PERMANENT SUPPLY
Permanent supply to the customer will only be supplied when a Compliance
Form Checklist has been signed by Compliance Co-ordinator.
10.1
Incoming High Voltage Supply
The incoming high voltage supply between SA Power Networks high
voltage distribution system and the distribution transformer room shall
be via underground cables.
The customer will be required to install conduits or duct system from the
property boundary to the distribution transformer room to allow SA
Power Networks to install its cables. The easement width required for the
cables is normally 4.0m.
No structures may be erected or levels altered within the easement
without written permission of the relevant SA Power Networks Manager.
10.2
Approval
The design of the conduit route and formation is to be included on the
building construction drawing and is to be approved by SA Power
Networks before construction commences.
Any subsequent alteration to design during construction must be
approved by the relevant SA Power Networks Manager. When
installation of the conduits is complete, the customer shall arrange
inspection by SA Power Networks, prior to backfilling or concrete pour.
10.3
Installations
All conduits are to be installed as per relevant SA Power Networks
Technical Standard but specific designs need to be undertaken in
conjunction with the SA Power Networks Manager.
SA Power Networks will inspect conduit location and installation before
backfilling.
10.4
Inspections
You must ensure the High Voltage switch room is completed to SA
Power Networks standards and specifications prior to arranging an
Electrical Compliance Inspection.
OR
You must arrange for Electrical Compliance Inspection following the
completion of your works that are related to the provision of new high
voltage equipment on site.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 28 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
11.0 AGREEMENTS, APPROVALS AND CONSTRUCTION
On receipt of drawings of the distribution transformer room SA Power Networks
will advise the customer‟s representative that the building details, location and
access requirements are satisfactory, and that the customer can proceed with
the construction of the distribution transformer room.
This advice will be given on the understanding that it does not commit SA
Power Networks in any way.
11.1
Safety and Clearances
Distribution transformer room equipment shall be located with due
regard of safety or personnel working in the distribution transformer
room.
A clear passageway at least 1.0m wide shall be allowed from each
item of switchgear to the personnel access doors to the distribution
transformer room.
A clearance of at least 3.0m out from the front of the high voltage and
low voltage switchgear shall be allowed for safe operations.
Equipment shall be located such that any item of equipment may be
removed from the distribution transformer room with the remaining
equipment in service and under load.
A passageway of at least 4.5m wide shall be allowed for distribution
transformers.
The distribution transformers shall be sited with a clearance of 1.0m
away from walls, other distribution transformers and switchgear in order
to allow free air flow.
11.2
Earthing Requirements
The building/land owner is responsible for all SA Power Networks project
specification and all National and State code requirements in relation
to earthing of all equipment.
SA Power Networks will nominate the appropriate earthing scheme to
be employed at specific location e.g. CMEN or MEN.
All earthing within the installation shall meet all the requirements of the
relevant AS/NZS standards.
If modelled conditions prescribed in these relevant standards cannot
be met then a detailed earthing design shall be required and
submitted to the relevant SA Power Networks Manager for assessment.
The customer is to be advised that a regular earthing test program
needs to be in place for the ongoing compliance of the earthing
system as per the relevant AS/NZS standards.
The (HV) fault levels shall be considered as 25kA minimum.
For any conduits and cabling within the room provided for SA Power
Networks infrastructure „AS Constructed‟ drawings are to be provided.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 29 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Standard Designs
The customer must provide drawings of the proposed site, planned
conduit route through the property and distribution transformer room
location.
Along with a floor plan, relevant sections through the distribution
transformer room showing all levels, beams, columns, footpads and any
other structures within or outside the distribution transformer room shall
be shown.
Ventilation details that are submitted must show site and location of all
vents, ducts and fans.
The customer‟s representative is required to prepare for the builder‟s
guidance a building construction drawing and provide three (3) copies
of this drawing to SA Power Networks representative for reference
before construction of the distribution transformer room begins.
The approved „For Construction‟ drawing is to show:
 The location of the distribution transformer room in relation to
adjoining construction and to the street. If not on the street
alignment, this should include the access route, type of road
surface, relative levels of the roadway and any overhead
obstruction and details of levels external to the distribution
transformer room.
 Drainage arrangements in the vicinity of the distribution transformer
room.
 The location of the customer‟s main switch room and the route of
the cables, busbars or bus way from the point of supply to the main
switchboard.
 Details of cable pits and conduits provided by the customer to
enable SA Power Networks to install HV and LV cables between the
distribution transformer room and the property boundary.
 Any variation from SA Power Networks distribution transformer room
specification. These must be either alternative forms of building
construction or specifically-negotiated modifications approved by
SA Power Networks Manager.
 The permanent means of access for SA Power Networks personnel
and equipment.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 30 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
11.3
11.4
Inspections
The builder will undertake regular dialogue with the relevant
SA Power Networks Manager during the construction phase with on-site
meetings undertaken at critical milestones of the project.
For Example:
At the Pre-Construction Stage:
o Setting up of conduit installation
At the Pre-Connecting Stage:
o The SA Power Networks Manager will utilise the services of
a Compliance Officer as required.
On receipt of 2 weeks notice, SA Power Networks Compliance Coordinator in conjunction with the SA Power Networks Manager can
audit the set out of conduits, cable trenches, cable trays and pits etc.
before backfilling or concreting is commenced.
Notes:
1. It is the responsibility of the builder to contact SA Power Networks to
make arrangements for this inspection.
2. It is SA Power Networks relevant Manager‟s responsibility to
communicate with the SA POWER NETWORKS Connect Officer at
various milestones throughout project.
11.5
Certificates of Compliance - Construction
Prior to energisation and hand-over of the distribution transformer room
to SA Power Networks, the customer must provide the following
supporting documentation for:
 Load bearing floors and walls;
 3 hrs fire rating of distribution transformer room; and
 Compliance to all relevant Australian Standards and Building Code
of Australia; and
 Other documentation as required.
Refer to TS 105-F-40, FORM 40: “The Construction Check Sheet for
SA Power Networks – For Indoor Distribution Equipment and Transformer
Room” which are interactive forms and are available from the SA
Power Networks websites:
 Intranet Website:
TS105 Test Standard Appendix A – Forms
 Internet Website:
TS105 Test Standard Appendix A – Forms
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 31 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
TS-108 – Technical Standard for Distribution Equipment and Transformer Rooms
Lighting and Power within T/F Room Enclosure
11.6.1 Temporary (During Construction Stage)
Prior to handover of the distribution transformer room enclosure,
the enclosure shall contain suitable temporary lights and power
supplied from the customer‟s installation to allow the safe
installation of distribution transformer room equipment.
11.6.2 Permanent
The customer will supply and install within the distribution
transformer room necessary light fittings including power outlets
and all wiring as per the Building Code of Australia.
Where required, equipment such as exhaust fans, pumps, and
controls will be provided and installed by the customer in
accordance with this specification.
The customer will undertake the wiring to these units. All wiring
specified above shall be undertaken in accordance with
relevant Australian Standards.
12.0 Maintenance/Repair of the Dist. T/F Room
The Landowner is responsible for the maintenance and repair of the Distribution
Transformer room and its contents (other than the distribution equipment which
is SA Power Networks responsibility).
In the event of damage or a maintenance concern to the Distribution
Transformer room which renders the Distribution Transformer room unsafe, the
Landowner must take immediate action at its cost to ensure the safety concern
is remedied.
If the Landowner fails to act SA Power Networks retains the right to effect repairs
and the value of the repairs shall be a debt due from the Landowner to SA
Power Networks.
TS-108
Issue: 03/09/12
Authorised: Jehad Ali
Date: 03/09/12
Page 32 of 32
The use of this Technical Standard is subject to the conditions stated in SA Power Networks disclaimer.
WARNING: Printed copies of this document ARE DEEMED UNCONTROLLED. The most up-to-date version is located on the internet/intranet.
11.6