Single conductor MC cable
- Thread starter loren
- Start date
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Minuteman
Senior Member
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- The Sooner Nation
Explain single conductor MC cable. My first impression is a MC cable with the other conductors removed or not used. Am I missing something?
electric_instructor
Senior Member
Maybe?
Maybe?
330.108 Equipment Grounding
The following explanations apply only to installations of single-conductor Type MC cable. If single Type MC conductors are installed as open runs or as messenger-supported wiring, the smooth or corrugated metallic sheath on each conductor must have sufficient cross-sectional area to comply with Table 250.122, or concentric conductors may be provided over the conductor under the metallic sheath. Either the metallic sheath or the combination of the concentric conductors in parallel with the metallic sheath may be used to provide the required equipment grounding path. For single Type MC conductors with an interlocking metal tape armor installed as open runs or as messenger-supported wiring, concentric conductors must be provided over the conductor under the metallic sheath. The total cross-sectional area of the concentric conductors must comply with Table 250.122.
If single Type MC conductors are installed in cable tray, the cable tray, an equipment grounding conductor(s) within the cable tray, and/or the equipment grounding provided with the single conductor may be used individually or in any parallel combination to provide the equipment grounding path required by 392.3(C) and 250.118.
If single Type MC conductors are installed underground in a trench, a separate equipment grounding conductor may be installed in close proximity to the circuit conductors within the same trench. The separate equipment grounding conductor may be used alone or in parallel with the equipment grounding provided with the single conductor cables to provide the equipment grounding path required by 300.5(I) and 250.118.
If single Type MC conductors are installed in parallel, the equipment grounding path provided with each conductor must be sized on the basis of the ampere rating of the overcurrent device protecting the circuit conductors according to 250.122(F). A smaller equipment grounding conductor may be permitted only if ground-fault protection of equipment is installed in accordance with 250.122(F)(2).
Maybe?
330.108 Equipment Grounding
The following explanations apply only to installations of single-conductor Type MC cable. If single Type MC conductors are installed as open runs or as messenger-supported wiring, the smooth or corrugated metallic sheath on each conductor must have sufficient cross-sectional area to comply with Table 250.122, or concentric conductors may be provided over the conductor under the metallic sheath. Either the metallic sheath or the combination of the concentric conductors in parallel with the metallic sheath may be used to provide the required equipment grounding path. For single Type MC conductors with an interlocking metal tape armor installed as open runs or as messenger-supported wiring, concentric conductors must be provided over the conductor under the metallic sheath. The total cross-sectional area of the concentric conductors must comply with Table 250.122.
If single Type MC conductors are installed in cable tray, the cable tray, an equipment grounding conductor(s) within the cable tray, and/or the equipment grounding provided with the single conductor may be used individually or in any parallel combination to provide the equipment grounding path required by 392.3(C) and 250.118.
If single Type MC conductors are installed underground in a trench, a separate equipment grounding conductor may be installed in close proximity to the circuit conductors within the same trench. The separate equipment grounding conductor may be used alone or in parallel with the equipment grounding provided with the single conductor cables to provide the equipment grounding path required by 300.5(I) and 250.118.
If single Type MC conductors are installed in parallel, the equipment grounding path provided with each conductor must be sized on the basis of the ampere rating of the overcurrent device protecting the circuit conductors according to 250.122(F). A smaller equipment grounding conductor may be permitted only if ground-fault protection of equipment is installed in accordance with 250.122(F)(2).
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