Cable Ladder
     
Cable Ladder Standards & Specification
         

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

     Information with reference to conformity is described/highlighted within the proceeding 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 (metallic system components) are of non-flame propagating nature.

      According to electrical continuity characteristics. 

      RMS cable ladder systems possess electrical continuity qualities.

      According to electrical conductivity

      RMS cable ladder systems are electrically conductive system components

      According to resistance against corrosion

    RMS cable ladder systems are produced from steel with stainless steel or metallic finishes.
RMS Cable Ladder Systems generally complies with:
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 and 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

     

For the accommodation of cables the minimum internal radius of fittings available in 300mm.

     

Construction

     

System Components of which probability is high to come into contact with cables are then inspected to ensure that no damage has occurred to any component or cable when installed correctly. As with all components made of metal precautions should be exercised in accordance to handling. With the relevant COSHH regulations; gloves should be worn. Screwed connections that have been designed with resilience to combat the mechanical stresses occurring during installations and prolonged use and will not cause damage to cables or system components when correctly inserted. Screwed connections fall into accordance with 9.3.1 and 9.3.2 of the standard by being compliant to tests whilst remaining ISO metric threads. RMS cable ladder systems are predominantly assembled with the use of M10 cup square bolts and hex nuts with lock washers tightened to a torque of 45N/m. Other connections also require M10 hex bolts for clamps but require a tightening of a torque of 25N/m.

     

Mechanical Properties

     

All ladder lengths have been tested usually in coherence with the standard under 10.2 and 10.3 for verification of the loading graphs. It should also be mentioned independent testing has been carried out to verify the structural performance of the minimum and maximum temperature classifications for test condition.

 

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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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