50.04 Electrical safety
It must be ensured that the components used cannot cause injury under any circumstances, either during normal operation or in foreseeable cases of malfunction.
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It must be ensured that the components used for protecting persons or objects can reliably fulfil their function for an appropriate length of time.
50.04.1 Electrical components
All parts of the electrical equipment must be protected to at least the equivalent of IP 44 type protection (dust proof and splash proof). Exposed connectors/wires must be protected against abrasion in case of accident (side covers).
It must be ensured that the electrical components used cannot cause injury under any circumstances, either during normal operation or in foreseeable cases of malfunction. It must be ensured that the components used for protecting persons or objects can reliably fulfil their function during the period of the competition.
50.04.2 Power bus maximum voltage
The maximum allowed voltage in the main power bus is 400VDC or 285VAC. A secondary power bus may be used to supply energy to the critical systems at a maximum voltage of 20VDC or 14VAC.
50.04.3 High voltage symbols
Symbols warning of 'HIGH VOLTAGE' must be displayed on or near the electrical equipment protective covers; all symbols must comprise a black flash of lightning inside a yellow triangle with a black border. The sides of the triangle must measure at least 8 cm, but may be larger if practical.
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50.04.4 Insulation
Every part of the electrical equipment must be electrically insulated relative to all live components and system ground. Maximum default current is 20mA.
Wiring insulators can be required to be checked at any time by the FIM Permanent Technical Delegate. Double insulation will be required in high voltage or high current wires. Technical datasheets of the wires used will prevail under all circumstances.
Plus and minus wires from the battery must be insulated with respect to the chassis to withstand battery maximum voltage at least.
All electrically conducting non-live parts must be connected with the system ground.
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In cases where the voltage of the power circuit exceeds 36VDC, the power circuit must be separated from the on-board circuit by an appropriate insulator.
Insulating material not having sufficient mechanical resistance, i.e. paint coating, enamel, oxides, fibre coatings (soaked or not) or insulating tapes are not accepted.
50.04.5 Power Indicator
When the vehicle is in a powered on state, there must be two clearly visible indicators, one light on the instrument panel and one light on the rear of the vehicle.
The rear light must be red and visible from at least 10 m away, from the rear or the side.
50.04.7 General circuit breaker – 'Emergency Stop'
The general circuit breaker must disconnect from the cut-off switch and discharge the main bus voltage below 60V. This system will be referred to as general circuit breaker or “Emergency stop”.
Low power accumulators provided for low voltage circuits, e.g. auxiliary circuits, do not have to be isolated by the general circuit breaker (Emergency Stop) provided that they are completely isolated from the main power accumulators.
50.04.9 Fuses (over-current trip switches)
An over-current trip switch is a device which automatically interrupts the electrical current in which it is installed if the level of this current exceeds a defined limit value for a specific period of time.
Fuses must under no circumstance replace the general circuit breaker (Emergency Stop).
50.04.13 Capacitors
Voltage across capacitors belonging to the power circuit should fall below 65 volts within 5 seconds after the general circuit breaker is opened or the over current trips of the accumulator are blown.
50.04.15 Power control
A ‘se-clfosing’ throttle (power control) must be applied.
50.04.2 Accumulator (storage battery)
The type, dimensions and weight of accumulator/s cannot be changed between official practices and race.
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All on-board electrical equipment, unless consisting of items originally powered by dry batteries, small accumulators or their own solar cells, must receive its energy supply from the vehicle’s official accumulators.
IMPORTANT: As a condition of entry, a Material Data Safety Sheet must be supplied with the race entry for the machine, including all relevant details as to the accumulator chemistry, human and environmental hazards, handling and specific fire risks and precautions.
50.04.14 Accumulator fastening
The accumulator must be installed securely inside the vehicle and be protected against short-circuits and leakage. The accumulator must be attached to the frame or chassis using metal clamps with an insulating covering.
The fixing method must be designed in such a way that neither the accumulator nor the fastening device itself nor its anchorage points can come loose, even when subjected to a crash. A solid partitioning bulkhead must separate the location of the accumulator from the rider.
Each accumulator box must provide its own cooling and/or venting system. In modular battery systems, a heat shield is strongly recommended between modules, by means of an adiabatic shield or intumescent.
The accumulator installation must ensure that in the event of accumulator cell leakage or explosion, the contents are kept away from the rider and do not interfere in any way with the rider’s vision or the safe handling of the machine.
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