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Safety precautions
3.1.6 Safety Precautions for Hybrid/Electric Vehicles
EN
36
Any work on high-voltage systems is allowed only when wearing the corresponding personal
protective equipment.
Very high tensions occur on hybrid and electric vehicles. Due to voltage flashover on damaged
components, such as marten damage or touching live components, the risk of electric shock is
likely. High voltage at or in the vehicle can lead to death in case of inattention. Therefore regard
the following:
•
Only the following qualified employees are allowed to de-energize the high-voltage system:
– High-voltage technician
– Skilled electrician for predetermined operations – Hybrid or rather electric vehicles
– Skilled electrician
•
Place and attach warning signs and barriers.
•
Check the high-voltage system and the high-voltage lines for damage (visual inspection!).
•
De-energizing the high-voltage system:
– Regard the manufacturer- and vehicle-specific regulations.
•
Regard the vehicle manufacturer's instructions.
•
Securing the high-voltage system against re-activation:
– Withdraw the ignition key and keep it safe.
– Keep the service disconnect plug in a safe place or secure the battery master switch
against re-activation.
– Insulate the battery master switch, the plug connections etc. with dummy plugs, covering
caps or insulating tape with the corresponding warning notice.
•
Check the de-energized state with the MT-HV or another suitable and approved measuring
tool. Even with disconnected high-voltage system, residual voltage can still be present.
•
Ground and short-circuit the high-voltage system (necessary only if voltage is higher than
1000 V).
•
Voltage below 1000 V: Cover the parts which are close to the system or which are energized e.
g. with insulating cloth, hoses or plastic coverings. Voltage higher than 1000 V: Cover the parts
with insulating plates/protective panels specially developed for this purpose so that sufficient
protection against contact to adjacent parts is ensured.
•
Regard the following before re-energizing the high-voltage system:
– All tools and utilities are removed from the hybrid/electric vehicle.
– Remove the grounding and short circuit of the high-voltage system. Do not touch any of
the cables now.
– Attach the protective paneling that has been removed before.
– Remove the protective measures at the switching system.
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