This is the specification that separates a signalling charger from a general-purpose one, and it is worth asking explicitly. ARTC requires the charger to supply full load with the batteries removed, and to supply the normal operating load while recharging a fully discharged battery, restoring it to at least 75% of capacity within 10 hours. […]
AS 7703 clause 4.2.3 sets the method: battery storage shall be calculated to ensure power is available for the total period required, accounting for the maximum contiguous cloudy days at that location, battery capacity degradation over service life, and availability and reliability calculations. In practice that means three things a generic solar calculation omits: use […]
It is usually the dominant factor, and it is under-modelled. A signalling location case is a sealed metal enclosure in the sun; internal temperatures well above ambient are normal. VRLA life expectancy falls roughly 50% for every 10 °C sustained above 20 °C, so a 10-year design-life battery in a 40 °C location case is […]
ARTC’s DC power supply specification already requires chargers with network connectivity, a web interface, laptop diagnostics and fault and alarm management, so the monitoring path usually exists before anyone specifies monitoring. What it does not usually provide is cell-level condition data. There is currently no AS 7000-series clause mandating remote battery bank monitoring. It is […]
Yes, for the specified products. Transport for NSW Asset Standards Authority Type Approval TA 8045.1:2025, “Valen Power – 12 Volt Batteries”, covers the ENVIROX-CELPLUS Carbon Front Terminal range in 100 Ah, 170 Ah and 190 Ah (12EO+FT100, 12EO+FT170, 12EO+FT190). Discipline: Signals and control systems. Mode: Rail (Heavy Rail). Effective 8 December 2025. This matters more […]
AS 7703, the national railway signalling power supply standard, sets the conventions: 50 V DC for signalling logic and interlockings, 24 V DC for electronic equipment, 12–15 V DC for level crossing and legacy equipment, and 110/120 V AC for main distribution. ARTC’s level crossing standard specifies 12 V and/or 18 V nominal DC systems […]
For active level crossings, the most quotable Australian figure is from ARTC ESC-03-01 clause 5.3: batteries must operate the level crossing protection, control and train detection equipment, plus any signalling fed from that location, for a minimum of 48 hours with 10% residual capacity under average traffic densities. Note two subtleties that affect sizing: the […]
NiCd tolerates a wider temperature range, deep discharge and long neglect better, which is why it persists in legacy signalling installations. Sealed gel VRLA is lower cost, needs no watering, is easier to handle and dispose of, and is explicitly permitted. The pragmatic position most Australian RIMs have reached is that sealed long-life cells should […]
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