Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
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title: Medium-Voltage Cables
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## Action Submittals {toc}
−### The Contractor shall submit the following action submittals for review before fabrication or procurement: {note}
+### The Contractor shall submit the following action submittals for review before fabrication or procurement:
- Product data for the proposed cable, identifying voltage class, insulation level, insulation type, conductor size and material, shield type, and jacket material
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## Informational Submittals {toc}
−### The Contractor shall submit the following informational submittals: {note}
+### The Contractor shall submit the following informational submittals:
- Manufacturer's certified factory test reports per ICEA S-93-639 and AEIC CS8 for each reel furnished
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## Closeout Submittals {toc}
−### The Contractor shall submit the following closeout submittals before final acceptance: {note}
+### The Contractor shall submit the following closeout submittals before final acceptance:
- Field acceptance test reports for each cable run, including insulation resistance, shield continuity, and VLF withstand results
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# Environmental and Service Conditions {toc}
−## The voltage class of the cable shall match the system nominal operating voltage; a 13.8 kV system requires 15 kV class cable, not 5 kV class cable. {note}
+## The voltage class of the cable shall match the system nominal operating voltage; a 13.8 kV system requires 15 kV class cable, not 5 kV class cable.
## The most common error in medium-voltage cable specification is selecting a voltage class below the system operating voltage. Voltage class denotes the system band the cable insulation geometry is designed for, not a withstand margin. The 15 kV class is by far the most common for US campus, healthcare, university, and large commercial primary distribution because the prevalent 13.2 kV and 13.8 kV systems fall within it. {note}
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# Cable Construction {toc}
−## Insulation type is the central material choice. EPR (Type MV-105) operates at 105 °C and XLPE (Type MV-90) at 90 °C; the 15 °C higher operating temperature of EPR yields a meaningful ampacity advantage, and EPR is more flexible and easier to terminate in the confined manholes and switchgear cubicles typical of facility work. EPR is therefore the 80% default for institutional and facility primary feeders, while XLPE remains a valid lower-cost choice for straightforward duct-bank runs. {note}
+## Insulation type is the central material choice. EPR (Type MV-105) operates at 105 °C and XLPE (Type MV-90) at 90 °C; the 15 °C higher operating temperature of EPR yields a meaningful ampacity advantage, and EPR is more flexible and easier to terminate in the confined manholes and switchgear cubicles typical of facility work. EPR is therefore the usual choice for institutional and facility primary feeders, while XLPE remains a valid lower-cost choice for straightforward duct-bank runs. {note}
### The insulation type shall be EPR (Type MV-105) or XLPE (Type MV-90) as scheduled, and the type selected shall be consistent across all cable furnished for a given feeder.
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−## Copper tape shield shall be a minimum of 5 mil thick applied helically; the overlap determines the fault-return path quality, with 12.5% being the minimum and 25% commonly specified for a more robust return path. {note}
+## Copper tape shield shall be a minimum of 5 mil thick applied helically; the overlap determines the fault-return path quality, with 12.5% being the minimum and 25% commonly specified for a more robust return path.
### Copper tape shield overlap shall be a minimum of 12.5%, and shall be 25% where scheduled for enhanced fault-return capacity.
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−## Concentric neutral sizing shall be a full neutral for direct-buried runs; a one-third neutral is acceptable only for duct-bank runs where the available fault current is limited by system relay coordination. {note}
+## Concentric neutral sizing shall be a full neutral for direct-buried runs; a one-third neutral is acceptable only for duct-bank runs where the available fault current is limited by system relay coordination.
−## The jacket protects the shield and insulation from the installation environment and governs flame and smoke behavior inside buildings; the material shall be selected for the installation environment and any flame or low-smoke requirement. {note}
+## The jacket protects the shield and insulation from the installation environment and governs flame and smoke behavior inside buildings; the material shall be selected for the installation environment and any flame or low-smoke requirement.
### The cable jacket shall be PVC, LLDPE, HDPE, or LSZH as scheduled.
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−## Cable ampacity shall be coordinated with the served transformer kVA, the fuse or relay protection, and the cable impedance, so that the feeder cable is not the thermal weak link of the circuit even when the overcurrent device is correctly sized. {note}
+## Cable ampacity shall be coordinated with the served transformer kVA, the fuse or relay protection, and the cable impedance, so that the feeder cable is not the thermal weak link of the circuit even when the overcurrent device is correctly sized.
### The feeder cable ampacity shall coordinate with the upstream protective device rating and the downstream transformer kVA such that the cable is protected against overload and short circuit.
−## The cable shall not exceed its temperature limits in any operating state: 90 °C continuous for XLPE and 105 °C for EPR, 130 °C (XLPE) or 140 °C (EPR) emergency overload, and 250 °C short-circuit. {note}
+## The cable shall not exceed its temperature limits in any operating state: 90 °C continuous for XLPE and 105 °C for EPR, 130 °C (XLPE) or 140 °C (EPR) emergency overload, and 250 °C short-circuit.
# Terminations and Splices {toc}
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−## Splice type shall match the cable construction and the splice location, which may be a manhole, a direct-buried location, or a vault. {note}
+## Splice type shall match the cable construction and the splice location, which may be a manhole, a direct-buried location, or a vault.
### The splice type shall be heat-shrink, cold-shrink, or pre-molded as scheduled, complying with IEEE 404.
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# Delivery, Storage, and Handling {toc}
−## Cable shall be delivered on reels with each end sealed against moisture ingress, because moisture in the conductor strand or under the shield migrates along the cable and degrades the insulation over its life. {note}
+## Cable shall be delivered on reels with each end sealed against moisture ingress, because moisture in the conductor strand or under the shield migrates along the cable and degrades the insulation over its life.
### Cable ends shall be sealed with manufacturer-supplied moisture-resistant end caps at delivery and shall remain sealed until termination or splicing.
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default: 2
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