Instrument Cable Tray Calculation

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.

Instrument cable tray calculation.

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. Chart is based on 50 fill of 4 utp category 6 cable o d 21 033lbs ft not maximum loading weight for the tray. The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area. Calculate size of cable tray for following cable schedule.

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. 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. 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. A 50 fill ratio should equal the maximum number of cables pulled in a given cross section.

Distance between each cable is 10mm. What is cable tray used for. Cable tray shall conform to as per nema ve1 or relevant indian standard. Cable tray ladders are categorized by width and height.

Per nec tray sizing instructions 1 insure that macros have been enabled. Maximum allowable tray fill per area in 2 tray design depth sum of od in total cross sectional areas of all cables. Cable raceway tray support calculations. 3 use the pull down menu to choose the type of cables being used and answer any of the pop up questions.

Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems. 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. Total sum of the diameters. 50mm tray only 100mm tray and ladder 150mm ladder.

Cable tray should be perforated and 20 spare capacity. 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. Some vendors go by inch so it would be 2 4 6. Practical guide on the amount of cable weight that can be installed tested in accordance with nema ve 1 csa e222 2 126 1.

Cable tray is sized based on the number and type of cables required for the current and future need. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows.