Not Allowed Power Cable Types; Motor Cable Shield; Additional Us Requirements - ABB ACS880-11 Hardware Manual

64 Planning the electrical installation
EMT

Not allowed power cable types

PE


Motor cable shield

If the motor cable shield is used as the sole protective earth conductor of the motor,
make sure that the conductivity of the shield is sufficient. See section
on page 67, or IEC 61800-5-1.
To effectively suppress radiated and conducted radio-frequency emissions, the cable
shield conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminum shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
concentric layer of copper wires with an open helix of copper tape or copper wire. The
better and tighter the shield, the lower the emission level and bearing currents.
1 Sheath
2 Copper wire shield
3 Helix of copper tape or copper wire
4 Filling
5 Cable conductors


Additional US requirements

Use type MC continuous corrugated aluminum armor cable with symmetrical grounds
or shielded power cable for the motor cables if metallic conduit is not used. For the
North American market, 600 V AC cable is accepted for up to 500 V AC. 1000 V AC
cable is required above 500 V AC (below 600 V AC). For drives rated over 100
Corrugated or EMT cable with three phase conductors and a protective
conductor is allowed for motor cabling with phase conductor cross
section less than 10 mm
Symmetrical shielded cable with individual shields for each phase
conductor is not allowed on any cable size for input or motor cabling.
1
2
(8 AWG) or motors < 30 kW (40 hp).
3 4
2
General rules
5