Cable Ladder
     
Cable Ladder Standards & Specification
       
RMS Cable Ladder Systems generally conform to

      BS EN 61537:2007 Cable management–cable ladder and cable ladder systems

     Information relating to compliance is detailed / highlighted within the following sections of the standard:

      Classification

      According to material

      RMS cable ladder systems are metallic system components

      According to resistance to flame propagation

      RMS cable ladder systems are non-flame propagating metallic system components

      According to electrical continuity characteristics

      RMS cable ladder systems have electrical continuity characteristics

      According to electrical conductivity

      RMS cable ladder systems are electrically conductive system components

      According to resistance against corrosion

    RMS cable ladder systems are made of steel with metallic finishes or stainless steel
Classification For Resistance Against Corrosion Reference – material and finish
     
0 (a) None
    1    Electroplated to a minimum thickness of 5µm
    2    Electroplated to a minimum thickness of 12µm
    3    Pre-galvanised to grade 275 to EN 10346 and EN 10326
    4    Pre galvanised to grade 350 to EN 10346:2009 
    5    Post– galvanised to a zinc coating thickness of 45µm according to ISO 1461 for zinc thickness only
    6    Post– galvanised to a zinc coating thickness of 55µm according to ISO 1461 for zinc thickness only
    7    Post– galvanised to a zinc coating thickness of 70µm according to ISO 1461 for zinc thickness only
    8    Post– galvanised to a zinc coating thickness of 85µm according to ISO 1461 for zinc thickness only
    9A Stainless steel manufactured to ASTM : 240/A 240M—95a designation S30400 or EN 10088 grade 1-4301 without a post treatment.
    9B Stainless steel manufactured to ASTM : 240/A 240M—95a designation S31603 or EN 10088 grade 1-4404 without a post  treatment(b)
    9C Stainless steel manufactured to ASTM : 240/A 240M—95a designation S30400 or EN 10088 grade 1-4301 with post treatment(b)
    9D Stainless steel manufactured to ASTM : 240/A 240M—95a designation S31603 or EN 10088 grade 1-4404 with a post treatment.
    (a)  For materials which have to be declared corrosion resistance classification.
    (b)  The post - treatment process is used to improve the protection against crevice crack corrosion and the contamination by other     steels.

    According to temperature

    Minimum temperature for the system components is given in Table 2.

    Maximum temperature for the system components is given in Table 3.
                         

Table 2 - Minimum temperature classification
    Minimum transport, storage installation and application temperature °C

   

Table 3 - Maximum temperature classification
    Maximum transport, storage installation and application temperature °C

   
+5
-5
-15
-20
-40
-50
+40
+60
+90
+105
+120
+150
According to the free base area of the cable ladder length as given in Table 5.

Table 5 Free base area classification

Classification

   

Perforation in the free base area

   
X
Y
Z
   
Up to 80%
Over 80% and up to 90%
More than 90%
 

Minimum internal radius of fittings

     

Minimum internal radius of fittings available for the accommodation of cables is 300mm.

     

Construction

     

Surfaces of systems components which are likely to come into contact with cables during installation are inspected to ensure they shall not cause damage to the cables when installed correctly.

     

As with all metallic system components, care should be exercised that handling is in accordance with the relevant COSHH regulations and gloves should be worn.

     

Screwed connections have been designed to withstand the mechanical stresses occurring during installations and normal use and will not cause damage to cables when correctly inserted. Screwed connections are general ISO metric threads fully compliant to tests in accordance with 9.3.1 and 9.3.2 of the standard. RMS cable ladder systems are usually assembled using M10 cup square bolts and hex nuts with lock washers for couplers etc tightened to a torque of 45N/m. Other connections require M10 hex bots for clamps etc tightened to a torque of 25N/m.

     

Mechanical Properties

     

Cable ladder lengths have been tested generally in accordance with the standard under 10.2 and 10.3 for verification of the loading graphs. It should be noted that independent testing has been carried out to verify the structural performance of the cable ladders at the minimum and maximum temperature classifications for test conditions.

   

All accessories e.g. bends, tees, etc. should be directly supported by a suitable support device or devices at appropriate positions.

 

Copyright © 2014 RMS Electrical. All Rights Reserved.
R.M.S. Limited: Company Registration No. 02802948, Registered in England & Wales
Registered Office: 22 Glenmore Business Park, Colebrook Way, Andover, Hants SP10 3GL


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