4.5 High power electrical connections
It is critical that the high-power electrical connections are
done correctly to ensure safe, compliant, and warranted
performance of the charging equipment.
• Ensure that the upstream power feeds are off and locked
out
throughout the work.
• The charging equipment must not be energized at any time
during the installation. To ensure personnel and equipment
safety, power will be applied for the first time during the
commissioning phase.
• Ensure that the cables used meet the minimum
requirements specified by Siemens.
• Ensure that the lugs are compatible with fine-strand cable,
and that the crimping die is correct for both the wire type
and lug type.
• Double check lug, cable, and crimp die compatibility.
Figure 4: F type die from Klauke
• A small amount of
copper
jointing compound must be
applied to the contact patch of all lug to copper busbar
connections. This inhibits corrosion at the joint to maintain
a good connection for the life of the charging system.
• Use a flat washer in contact with the top of the lug and a
spring washer on top of the flat washer for all bolted lug
connections.
• Torque all connections to the specified amount and mark
the torque with a paint pen immediately.
• Clearly label all cables. Relabel when a cable is shortened,
if required.
• Mark all cables with colour coded heat shrink.
• Do not cover the entire lug with heat shrink; leave one
crimp mark showing so that the correct crimping tool
stamp is shown.
SAFETY WARNING!
Only trained and competent electricians are authorized to
perform this work.
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