10Electrical requirements#

10.1General#

Clarification of the requirements on RPEQ certification for designed systems and products.

All electrical Works shall comply with the Electricity Legislation as defined in Table 2, and the relevant parts of AS/NZS 3000, AS/NZS 3015, AS/NZS 3100 and AS/NZS 3760 as applicable.

Where the electrical installation is to be used on construction Sites, comply also with the relevant parts of AS/NZS 3012.

Detailed designs of the electrical systems and products shall be certified by the Contractor's RPEQ before being submitted to the Administrator for acceptance prior to construction. Hold Point 2

10.2Mains power#

Unless otherwise specified, mains power shall be provided at each ITS device Site. The supply shall be designed to meet the requirements of each individual field Site and as shown in the relevant design drawings. Mains power shall be provided in accordance with MRTS210 Provision of Mains Power.

Where a new installation draws supply from an existing departmental switchboard, the Contractor shall document both the existing and new equipment supplied from the existing switchboard to the full extent. The Contractor shall liaise with the department on the extent of the required updates to existing drawings prior to commencing the design.

The Contractor shall be responsible for updating the power consumption with the relevant energy supplier.

10.3Protection against electrical transients and over-voltage#

Where the Site is assessed to AS/NZS 1768 to be susceptible to lightning, incorporate measures to protect against electrical transients and over-voltage. Protection shall follow the recommended practices and general guidelines for the protection of persons and property from hazards arising from exposure to lightning in accordance with AS/NZS 1768 and AS 4070.

Surge protection devices shall be provided on each end of copper cables connecting equipment, both power and communications cables, where they enter a protected area.

For requirements and relevant standards refer to TRUM Vol 4 Part 3.

10.4Switchboards, wiring and terminals#

Unless otherwise specified, switchboards shall be provided a degree of protection of IP56 in accordance with AS 60529.

Switchboards (and their internal wiring and terminals) shall be provided in accordance with MRTS210 Provision of Mains Power and MRTS226 Telecommunications Field Cabinets. Terminals and cabling installed external to the switchboard enclosure shall be provided in accordance with MRTS256 Power Cables.

10.5Uninterruptable Power Supply (UPS)#

Uninterruptible power supplies shall comply with the requirements of MRTS213 UPS for Roadside Devices.

10.6Alternate power sources#

10.6.1Solar power supply#

Standalone solar power supplies shall comply with the requirements of MRTS263 Standalone Solar (PV) Power Systems.

10.6.2Battery power supply#

Unless otherwise noted, where batteries are specified to provide power at the ITS device Site as a backup to mains supply, the following shall apply.

10.6.2.1Batteries#

Batteries shall:

  1. a)meet the relevant requirements of AS/NZS 5139, AS/NZS 4509.2 and AS IEC 62619
  2. b)be 12V or 24V as specified for the application
  3. c)be suitably rated for the application
  4. d)be suitably matched to the battery charger
  5. e)if lead acid type, be of AGM or Gel technology
  6. f)if lithium type, be complete with a battery management system, to ensure battery requirements are complied with throughout the battery life cycle including low voltage disconnect, over voltage protection, short circuit protection, reverse polarity protection, internal cell balancing, cell thermal protection, and the like
  7. g)be rated for minimum 3000 cycles to 50% DoD for lead acid and 80% DoD for lithium technology (C20) at 20°C
  8. h)have a round trip efficiency of > 80% for lead acid and > 90% for lithium
  9. i)have self-discharge rate < 3% per month
  10. j)be of standard size and capacity and easily field replaceable
  11. k)operate the connected load at the Site continuously for:
  12. i.16 hours without recharge for Sites within one hour's drive from the Principal's nearest maintenance facility, or
  13. ii.72 hours without recharge for Sites greater than one hour's drive from the Principal's nearest maintenance facility.
  14. l)be complete with isolation and overcurrent protection in accordance with AS/NZS 4509.2.

10.6.2.2Mains battery charger#

Mains battery chargers shall:

  1. a)meet the relevant requirements of AS/NZS 4509.2
  2. b)use a safety isolating transformer complying with AS/NZS 61558.2.6 to ensure the output does not exceed ELV
  3. c)be suitable for continuous operation
  4. d)have battery temperature compensation complete with temperature sensor if required for battery technology
  5. e)be suitably matched to the battery. (Note that lead-acid chargers are not acceptable for lithium batteries; only chargers that have been designed for and are matched to the lithium battery are acceptable)
  6. f)ensure the battery is charged efficiently in accordance with the manufacturer’s requirements without being overcharged or damaged due to overheating, while simultaneously supplying the load
  7. g)have reverse polarity protection
  8. h)have high temperature protection
  9. i)have protection against short-circuit and overload
  10. j)have over voltage protection
  11. k)have 1.5 m of appropriately sized cable to AS/NZS 60227.5 with standard plug to IEC 60884 for ac connection, and
  12. l)have 1.5 m of appropriately sized dc cables one red and one black with crimped lugs for connection to the battery.

10.6.2.3Battery monitoring system#

The battery monitoring system shall:

  1. a)be complete with protection to prevent the batteries from being over discharged – maximum 50% DoD for lead acid and 80% DoD for lithium technology, and
  2. b)provide alarms for mains failure, 40% DoD for lead acid and 70% DoD for lithium technology, and battery shut down.

Where required under the Contract to send an alarm, provide a remote alarm indication that connects to the Principal's TMC via one or more of the following mechanisms:

  1. a)an autodialled with voice recorded message
  2. b)STREAMS, and/or
  3. c)any other mechanism agreed upon by the Principal.

Where specific equipment specifications require monitoring / logging of data, integrate these battery alarms into that system.

10.6.2.4Battery system installation#

Battery system installation shall comply with the relevant parts of AS/NZS 4509.1 and AS/NZS 5139.

10.6.3Generator power supply#

Where a generator power supply is specified, the following shall apply:

  1. a)the generators supplied for alternative power systems shall comply with MRTS259 Transportable Generator, and
  2. b)the installation of generators supplied for alternative power systems shall comply with AS/NZS 3010.
Source: MRTS201 · pages 25–28 Open PDF at this page Search this document