Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Wireways and Auxiliary Gutters
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grounding and bonding conductors within the enclosure (use [[sync/grounding-and-bonding]]);
panelboard, switchboard, and switchgear enclosure interiors (use
− [[sync/low-voltage-panelboards]], [[sync/low-voltage-switchboards]],
+ [[sync/panelboards]], [[sync/low-voltage-switchboards]],
[[sync/low-voltage-switchgear]]); and wiring troughs integral to an MCC lineup
(use [[sync/motor-control-centers]]).
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## All troughs and fittings shall be UL 870 listed and bear the listing mark, except field-fabricated auxiliary gutters permitted under NEC 366.6.
−## The installer shall be experienced in the installation of enclosed raceway and supplemental enclosure systems of the type and size specified.
−
−## Conductor fill and ampacity derating calculations shall be prepared and stamped by, or under the direction of, the Engineer of Record where required by the AHJ. {note}
−
−## UL 870 (9th Edition, 2016, reaffirmed as an ANSI standard in 2023 with no technical changes) is the single product safety standard covering both wireways and auxiliary gutters and their fittings. {note}
−
```datasheet
label: Product listing requirement
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```
+## The installer shall be experienced in the installation of enclosed raceway and supplemental enclosure systems of the type and size specified.
+
+## Conductor fill and ampacity derating calculations shall be prepared and stamped by, or under the direction of, the Engineer of Record where required by the AHJ.
+
+## UL 870 (9th Edition, 2016, reaffirmed as an ANSI standard in 2023 with no technical changes) is the single product safety standard covering both wireways and auxiliary gutters and their fittings. {note}
+
# Environmental and Service Conditions {toc}
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## Voltage Rating {toc}
−### Standard wireways and auxiliary gutters are rated 600 V; products listed for 1000 V are available for 1000 V distribution systems and shall be specified where the system voltage exceeds 600 V. {note}
+### Standard wireways and auxiliary gutters are rated 600 V; products listed for 1000 V are available for 1000 V distribution systems and shall be specified where the system voltage exceeds 600 V.
### The trough voltage rating shall equal or exceed the nominal system voltage of the conductors it encloses.
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### The interior cross-section shall be sized so that the conductor fill does not exceed the limit set by the governing NEC article for the segment classification. {note}
−### Specifying a cross-section without also specifying section length and a fittings bill of material leads to quantity RFIs; the schedule shall give width, height, lengths, and fittings together. {note}
+### Specifying a cross-section without also specifying section length and a fittings bill of material leads to quantity RFIs; the schedule shall give width, height, lengths, and fittings together.
### The trough cross-section shall be selected so that the design conductor fill does not exceed 20% in a wireway, or 20% conductors-only (75% with splices and taps) in an auxiliary gutter.
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# Fittings {toc}
−## Fittings complete the routing geometry of a wireway or gutter system and shall be listed components of the same product family as the straight sections to ensure dimensional and finish compatibility. {note}
+## Fittings complete the routing geometry of a wireway or gutter system and shall be listed components of the same product family as the straight sections to ensure dimensional and finish compatibility.
## Direction changes, intersections, size transitions, and terminations shall be made with manufactured fittings matching the trough material, size, and NEMA type.
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- Spare splice plates
```