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26 Guidelines for planning the electrical installation
Selecting and routing the energy storage cables
Recommended cables
￭
The customer (or the system integrator) must acquire and connect the energy storage
cables. It is possible to use either 3-conductor shielded cable(s) or 4-conductor shielded
cables:
• If you use a 4-conductor shielded cable, use 2 conductors for plus and 2 conductors for
minus and the shield for PE.
• If you use a 3-conductor shielded cable, use 1 conductor for plus, 1 conductor for minus
and 1 conductor and the shield for PE.
If the DC feeder has parallel strings, obey the additional guidelines in section
connection (page
26).
Typical cable sizes
￭
See the technical data.
Minimizing electromagnetic interference
￭
The customer (or the system integrator) must obey these rules in order to minimize the
electromagnetic interference caused by rapid current changes in the energy storage cables:
• Shield the energy storage cabling completely, either by using shielded cable or a metallic
enclosure. Unshielded single-core cable can only be used if it is routed inside a cabinet
that efficiently suppresses radiated emissions.
• Install the cables away from other cable routes.
• Avoid long parallel runs with other cables. The minimum parallel cabling separation
distance should be 0.3 meters.
• Cross other cables at right angles.
Keep the cable as short as possible in order to minimize the radiated emissions.
Maximum cable length
￭
The maximum cable length of the energy storage cable(s) is 100 m (328 ft).
EMC compliance of the complete installation
￭
ABB has not verified that the EMC requirements are fulfilled with external energy storage
and its cabling. The EMC compliance of the complete installation must be considered by
the customer (or the system integrator).
Parallel connection
One DC feeder unit can contain one single or up to 3 parallel connected strings.
Parallel strings must have separate energy storages. Each parallel string must also have
its own connection cabling. ABB recommends that you use identical cablings (cable type,
cross-sectional area, and length) and have an identical load for each string. For more
information, contact ABB.
Parallel
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