Instrument Cable Tray Calculation

What is cable tray used for.

Instrument cable tray calculation.

Maximum allowable tray fill per area in 2 tray design depth sum of od in total cross sectional areas of all cables. Total sum of the diameters. 50mm tray only 100mm tray and ladder 150mm ladder. 10 08 03 cable trays a standards i nema ve1 and ve2 ii iec 61537 iii nec 392 b cable trays fittings and accessories shall be fabricated out of rolled mild steel sheets free from flaws such as laminations rolling marks pitting etc.

3 use the pull down menu to choose the type of cables being used and answer any of the pop up questions. Cable raceway tray support calculations. Some vendors go by inch so it would be 2 4 6. Most project specified the height of the ladder tray so that the entire system will fit with each other while width can be adjusted by reducers enlargers.

Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems. Practical guide on the amount of cable weight that can be installed tested in accordance with nema ve 1 csa e222 2 126 1. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. Per nec tray sizing instructions 1 insure that macros have been enabled.

Cable tray ladders are categorized by width and height. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows. Distance between each cable is 10mm. 1 2 no s of 3 5cx300 sq mm xlpe cable having 59 7mm outer diameter and 5 9 kg meter weight 2 2 no s of 3 5cx400 sq mm.

A minimum clearance of 9 in 22 9 cm should be maintained between the top of a tray and beams piping etc to facilitate installation of cables in the tray. Calculate size of cable tray for following cable schedule. A in general vertical spacing for cable trays should be 12 in 30 5 cm measured from the bottom of the upper tray to the top of the lower tray. Chart is based on 50 fill of 4 utp category 6 cable o d 21 033lbs ft not maximum loading weight for the tray.

Download cable tray and conduit sizing excel sheet free calculator for electrical design engineers to determine the size of cable tray and the wire conduits. Cable tray should be perforated and 20 spare capacity. A 50 fill ratio should equal the maximum number of cables pulled in a given cross section. Calculate cable tray width calculate cable tray area calculate cable tray length calculate cable tray weight calculate remaining width of cable tray calculate remaining area of cable tray free download.

The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area. Cable tray is sized based on the number and type of cables required for the current and future need.