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All cables produced to this specification are recognized by the NEC as 600 Volt Type MC-HL and are suitable for use as described in the code. The conductor temperatures are rated for continuous operation of 90 degC, for emergency overload of 130 degC and for short circuit of 250 degC. The cables meet the requirements for application in NEC Class I , Class II and Class III, Div 1 and 2, Hazardous Locations covered under NEC Articles 501, 502 and 503. The cables are intended for use in industrial applications where aluminum armor protection is necessary. The continuously welded sheath serves to provide a completely moisture impervious barrier for the core as well as providing superior electro static shielding characteristics. The cables may be used in wet or dry applications, installed in racks, trays or aerially.
These cables have an overall jacket and can be direct buried in earth and buried in concrete.
Three conductor cables are manufactured in accordance with industry accepted practice of using three symmetrically placed grounds making them advantageous for use in pulse-width modulated cables and variable frequency drive applications.
This specification covers single and multi-conductor power cables insulated with flame retardant crosslinked polyethylene (XLP). The insulated conductors cabled with a ground wire or wires, and the assembly are encased in a moisture impervious continuously welded corrugated aluminum armor, and covered with a protective jacket overall. Three conductor type cables are constructed for VFD applications.
Conductors - The conductors consist of uncoated soft, copper strands meeting the requirements of ASTM B3. Unless otherwise specified the conductors are supplied as compact round per ASTM B496.
Insulation - The insulation is flame-retardant crosslinked polyethylene (XHHW-2) extruded concentrically over the conductor to the wall thickness for Type XHHW-2 as specified in the relevant governing specification.
Conductor Coding - Phase identification is provided by number code on each insulated conductor.
Ground Wire - Three stranded bare copper ground wires located in each of the outer interstices for 3 conductor cables, one in one of the interstices for 2 or 4 conductor cables, or helically applied concentric wires for single conductor cables. The total ground wire cross section in all cases meets the minimum UL requirements for ground size.
Assembly - Conductors and ground wire are cabled together with a left hand lay and suitable fillers make the cable round. A binder tape is applied.
Armor - Over the taped assembly there is continuously welded corrugated aluminum armor.
Jacket - A protective sunlight and ozone resistant PVC or low smoke halogen free (LSHF) polyolefin jacket is extruded for a tight fit over the interlocked armor.
Notes:*Compressed conductors**Based on cables installed in uncovered cable tray at 30°C ambient temperature per NEC.