Wire Cable Tray: Uses, Types, Raceway Rules & Bending Guide

Trådkabelbrett er an åpne structural support system for routing and protecting electrical cables in commercial, industrial, and increasingly residential applications. Skuffkabel kan be used in residential settings under specific NEC conditions. Kabelbrett is klassifisert som en racerbane under NEC. Wire mesh cable tray can be bent on-site using simple hand tools without cutting.

Hva er kabelkabel?

Tray cable (TC cable) is a factory-assembled multi-conductor cable specifically listed and rated for installation in cable tray systems. Det er definert under NEC artikkel 336 and UL 1277, and it differs from standard building wire in several important ways:

• It contains two or more insulated conductors, often with an overall jacket of PVC, nylon, or flame-retardant thermoplastic.
• The outer jacket is rated to withstand the mechanical abuse, UV exposure, and oil or moisture that open cable tray environments present.
• It is available in control, power, and instrumentation configurations — commonly used in manufacturing plants, data centers, petrochemical facilities, and utilities.
• Conductors range from 18 AWG (control) to 1000 kcmil (power), with voltage ratings typically at 600 V or 1000 V.

Vanlige brettkabelbetegnelser inkluderer TC-ER (Exposed Run, suitable for direct exposure in cable tray without conduit), TC-ER-JP (med ekstra jakke og UV-beskyttelse), og PLTC (Power-Limited Tray Cable, for low-energy instrumentation). The "ER" suffix is critical — it allows the cable to run exposed between cable tray and equipment without the need for a conduit transition, saving significant labor cost on large industrial projects.

Tray cable is distinct from THWN or XHHW building wire in that building wire requires a raceway enclosure (conduit, wireway, or cable tray) at all times, whereas TC-ER cable can bridge short exposed sections under NEC 336.10(7).

Kan du bruke kabel i boliger?

Ja - men med viktige betingelser. NEC Article 336.10 lists the permitted uses for tray cable, and residential applications are allowed when the following criteria are met:

• Type TC- eller TC-ER-kabel must be listed for the application and installed per NEC 336.10.
• I en- og tomannsboliger , TC-kabel er kun tillatt i kabelbakker. It cannot be run loose through walls or concealed spaces the way NM (Romex) cable can.
• I flermannsboliger , TC cable is accepted in cable trays, conduit, or as open wiring where the voltage does not exceed 150 V to ground and conductors are not smaller than 12 AWG — per NEC 336.10(6).
• TC-ER cable may run between the tray and a connected piece of equipment for a maximum of 1,8 m (6 fot) without additional protection, provided it is not subject to physical damage.

In practice, cable tray and TC cable appear most often in solcelleanlegg i boliger , where homeowners and installers route PV wiring through exposed tray in garages, attics, or mechanical rooms. They also appear in high-end custom homes with structured wiring rooms, home automation systems, and exposed-industrial interior aesthetics.

For most standard residential new construction, NM-B (Romex) remains dominant because it is cheaper and faster to install without a tray system. However, for renovation projects with accessible ceilings or exposed-beam architecture, cable tray with TC cable offers a clean, organized, and code-compliant alternative that also makes future adds and changes significantly easier.

Er kabelrenne en raceway?

Yes — under the NEC, cable tray is classified as a raceway. NEC Article 392 governs cable tray systems, and NEC 100 defines a raceway as "an enclosed channel of metallic or nonmetallic materials designed expressly for holding wires, cables, or busbars." Kabelbrett oppfyller denne definisjonen.

This classification has several practical consequences:

It is worth noting that cable tray differs from conduit and wireways in one key way: it is open , not enclosed. This openness improves heat dissipation (which is why fill rules are less restrictive than conduit by volume) but requires that all cables installed in it be independently rated for tray use.

Some engineers and inspectors informally treat cable tray as simply a "support system" rather than a raceway — this is technically incorrect under the NEC and can lead to improper cable selection, grounding omissions, and failed inspections. Always treat cable tray as a raceway from a code-compliance standpoint.

Hvordan bøye nettingkabelbrett

Wire mesh cable tray (also called wire basket tray or wire duct) is the most flexible cable tray type for field fabrication. Unlike ladder tray or solid-bottom tray, wire mesh can be bent, cut, and shaped on-site with basic hand tools — no special bending equipment required.

Tools you need

• Angle grinder or bolt cutters (for cutting longitudinal wires)
• Flat-nese eller lineman's tang
• Målebånd og markør
• Fil eller kvern for avgrading av kuttede ender
• Valgfritt: bøyejigg eller treformblokk for jevn radius

Horisontal bøy (flat sving)

• Mark the bend centerline across the tray base using a marker.
• Identify the inside radius wires (bottom of tray) — these need to be cut to allow the tray to compress at the bend.
• Ved hjelp av boltkuttere eller en vinkelsliper, kutt av nederste langsgående ledninger at the bend mark — typically every other wire for a 45° bend, or all wires for a 90° bend.
• Do not cut the side rails — they carry the structural load and must remain continuous through the bend.
• Gradually bend the tray by hand to the required angle. For en 90° sving, sikte på en minimum indre radius på 1× the tray width (f.eks. bør et 300 mm bredt brett ha en innvendig radius på minst 300 mm).
• Bruk en tang for å lukke eller krympe eventuelle avkuttede ledningsender mot skufferammen for å forhindre at kabelen setter seg fast.
• Avgrad alle avkuttede ledningsender med en fil – blottlagte ledningsender er en fare for slitasje på kabelkappen.

Vertikal bøy (stigning eller slipp)

• Marker bøyens senterlinje på brettets sideskinne.
• Cut the side rail wires på innsiden av bøyen (kompresjonssiden) ved bøyemerket.
• Basistrådene forblir ukuttet - de blir strekksiden og holder bøyeformen.
• Bøy oppover eller nedover til ønsket vinkel og krymp de kuttede endene i flukt.
• For drops exceeding 300 mm, use a factory-fabricated vertical tee or elbow fitting instead of field bending — this maintains load rating and aesthetics.

Viktige bøyeregler og grenser

Når du skal bruke fabrikkinnredning i stedet

Field bending is practical for minor routing adjustments — small horizontal sweeps, gentle rises, or short drops. For the following scenarios, order factory-fabricated fittings instead:

• Brettbredden overstiger 450–600 mm
• Installasjonen er i en etsende eller klassifisert (farlig) plassering hvor kuttede ledningsender kan akselerere korrosjon eller skape antennelsesfare
• The bend will support significant cable weight (power feeders above 4/0 AWG)
• Installasjonen krever en konsekvent, inspiserbar estetikk (rene rom, datasentre, eksponert arkitektonisk interiør)
• Flere identiske bend er nødvendig - fabrikkinnredning er raskere og mer konsistent når kvantiteten rettferdiggjør kostnaden