Tips for Cable Tray Installation NSL Noise Susceptibility Level - QC Notes

 

Tray Installation, NSL Noise Susceptibility Level

Tray Installation, NSL Noise Susceptibility Level

Tray Installation:

Cable Tray Installation:  The publication is intended as practical guide for the proper installation of cable system. Cable tray systems design and Installation shall comply with NEC Article – 392 & 318,

NEMA VE1, NEME VE2 and NEMA FG 1 and follow safe practices as described in NFPA 70E.

Tips for Cable Tray Installation:

- Cable tray specification shall be per NEMA VE1 the tray shall be per NEMA VE2.

- The distance between consecutive rungs shall not exceed 229 mm (9 Inch).

- Cable Ties for Vertical Application shall be provided every 18 inch (after one rung).

- Cable Tied for Horizontal application shall be provided every 27 inch (after two rungs).

- Unless otherwise noted, the support interval shall be not more than 2.4 meters as per NEMA VE1.

- For the Vertical Application cable ties must be 316SS with PVC coated.

- The open gap between tray/conduit to the instrument maximum 350 mm.

- The cable tray system shall be installation with manufactures standards fittings.

- Such as Clamps, Splicer Plates, Connector, Hangers, Reducer Plates, Grounding Brackets Blind, Nut Bolts,

Washers etc.

-  The channel cable tray material shall be copper free aluminum (Aluminum with max of 0.4% copper).

- Channel cable tray width shall be 3, 4, or 6 inches with a minimum loading depth of 1 ¼ inch.

- Non metallic cable tray permitted in corrosive area. Non metallic cable trays shall be made of

flame retardant material.

Splice Plate

Tips for Cable Tray Installation
Expansion Plate

Tips for Cable Tray Installation
Pull Box


NSL: Noise Susceptibility Level

Level 1: High to Medium susceptibility analog signals of less than 50V and discrete instrument signal of less than 30V.

Level 2:  Low susceptibility switching signal greater than 30V, analog signals grater then 50 V and 120 ~ 240 AC feeder less than 20 Amps.

Level 3:  Power AC and DC buses of 0 ~ 1000 V with currents of 20 ~ 800 Amps.

Tray to Tray Spacing in mm:

  • NSL      1          2          3
  • 1          0          150       650

Tray to Conduit Spacing in mm:

  • NSL      1          2          3
  • 1          0          100       450

Conduit to Conduit Spacing in mm:

  • NSL      1          2          3
  • 1          0          75         300

Tray to Tray:

  • Level 1 to Level 2 gap should be             150 mm
  • Level 2 to Level 3 gap should be             500 mm
  • Level 1 to Level 3 gap should be             650 mm

Tray to Conduits:

  • Level 1 to Level 2 gap should be             100 mm
  • Level 2 to Level 3 gap should be             350 mm
  • Level 1 to Level 3 gap should be             450 mm

Conduit to Conduit:

  • Level 1 to Level 2 gap should be             75 mm
  • Level 2 to Level 3 gap should be             225 mm
  • Level 1 to Level 3 gap should be             300 mm

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