Print
Surface » Isolation of Energy, Including Parking
Design Philosophy:
Isolation of Energy, Including Parking
Objective
The objective is to minimise the risks of events related to achieving zero energy state for all vehicle energy sources, including parking (gravity), which might lead to injury, illness, damage, etc. to ALARP, including consideration in design for foreseeable human error.
Outcome
The intended design outcome should provide positive protection and confirmation of the zero energy state through:
- Isolation of the equipment energy systems achieved at the primary and stored energy source (not control circuit)
- Use of isolation devices that can be locked in the isolated position
- Provision of a 'try' step or test measurement for zero energy
Equipment parking systems shall facilitate fundamentally stable parking where all implements are placed on the ground and the park brake is positively engaged before the operator leaves the cabin.
View or download the Design Philosophy page.
Risks to be Mitigated
Stored energy systems, such as accumulators, not able to be isolated or reduced to zero energy
(13 resources)
Inadvertent defeat of positive isolation e.g. batteries only being isolated on a single pole
(3 resources)
Control circuits containing same type of device as that used for isolation, which lead to human error in isolation
By-passing the isolator to re-energise the machine or circuit e.g. 'jump start' circuits
(1 resources)
Other brake systems temporarily preventing the machine from 'rollaway', which release over time allowing a 'rollaway'
(8 resources)
Examples of Industry Attempts to Mitigate Risks
Electrical Isolation Lockout style switches for full battery and starter motor isolation provided at the point of primary operator access from ground level
(10 resources)
Isolation switches / valves fitted with a lockout device that will accept a 6mm shank padlock
(6 resources)
Main starter switch on the machine that does not isolate the two-way radio; boarding or interior lights, or interrupt any engine shutdown timer fitted
(1 resources)
Emergency stop switches that are single action push for 'off' (latch) and must be manually reset
(3 resources)
Other Sources of Energy Isolation systems provided for other stored energy sources, such as pneumatic, hydraulic or radiator pressure, where there exists the risk of injury due to unexpected release or activation of stored energy.
(17 resources)
Devices that alarm and/or indicate to the operator on leaving the cab that the park brake has not been correctly set
(1 resources)
EMESRT Information