The manufacture and use of cable tray is subject to strict and precise regulations. CABLOFIL® gives an update on applicable texts and guarantees conformance of its products.
Standards that are important in the Cable Tray/ Cabling industry:
- NEC: The National Electrical Code
- CSA: Canadian Standards Association
- NEIS: National Electrical Installation Standards equivalent to NEMA VE1
- NEMA VE1: National Electrical Manufacturers Association (partnered with CSA) Standard for Metal Cable Tray Systems
- NEMA VE2: National Electrical Manufacturers Association Standard for Cable Tray Installation Guidelines
- IEC 61537: International Electrotechnical Contractors Standard for Cable Tray Systems and Cable Ladder Systems for Cable Management
- IEC 60204: International Electrotechnical Contractors Standard for Safety of Machinery/Electrical Equipment with Machinery
- NFPA 79: National Fire Protection Association's Standard; equivalent to IEC 60204
- NFPA 70: National Fire Protection Association's Standard; equivalent to NEC
|CSA C22.2/NEMA VE1
Click Here for Certificate
Metal Cable Tray Systems, a joint standard published for the United States by NEMA, and published for Canada by CSA, is one of the key cable tray standards in our market. The most recent version of this standard (2002) includes many changes that affect Wire Mesh Cable Tray.
The standard "provides technical requirements concerning the construction, testing, and performance" of cable tray. Test requirements given by the standard are Electrical Continuity Testing and Load Testing; requirements for marking cable trays are also given.
Compliance to this standard is not regulated by NEMA or any other organization in the United States in the manner that National Electrical Code (NEC) compliance is regulated; this standard is a "recommendation" or "suggestion" for cable trays. Cable tray manufacturers may have their products tested by an independent laboratory for compliance to this standard, as Cablofil has done. In Canada, however, this standard is regulated, and compliance is mandatory just as NEC compliance is required in the U.S.
Cablofil hired UL (Underwriters Laboratories) to 3rd party witness testing of our products for compliance with CSA C22.2/NEMA VE1. UL's test witnessing group is separate from the CSA (Canadian Standards Association). Cablofil's CSA Certificate of Compliance is the result of this testing.
The NEMA Test Method
As per NEMA VE-1/CSA 22.2, there are two methods of Load Testing
- Load Testing by Two Methods (Safety Factor of 1.5):
a) Loading to Destruction: Destruction Load/1.5=Rated Load Capacity=Tested Load
b) Loading to Residual Deflection: 1.5 x Span x Rated Load Capacity=Tested Load 15 minutes after total tested load is removed, residual deflection is measured.
Deflection vs. Destruction
Cablofil is unique in its loading performance due to its wire mesh pattern. When extraordinary and undue load is applied to Cablofil Tray, its wire mesh structure does not simply break under a certain load, but deflects gradually. Therefore, Cablofil's preferred method is to Deflection rather than Destruction.
A tray that would simply destruct could result in severe injuries or major damage.
|NFPA 70/NEC Article 392
The National Electric Code is a Regulation, as opposed to a Standard. It is equivalent to the National Fire Protection Agency's standard NFPA 70.
Cablofil Cable Tray was tested by Underwriter's Laboratory (UL) for NEC compliance. Click HERE for UL Report
The NEC regulates Cable Tray so as not to cause injury to personnel or damage to property. The CEC, Canadian Electric Code, is also closely related to the NEC.
The NEC restricts cable trays only "where subject to severe physical damage. (Article 392.4 NEC 2005)"
For a more detailed white paper on the NEC and Cablofil Tray in Power Installations, click HERE.
It is written by Professor Kimball, PE of the University of Illinois. The paper examines the NEC Code and answers questions related to Article 392 and Cablofil Tray.
Global Standards (IEC 61 537)
The IEC standard 61537: "cable tray systems and cable ladder systems for electrical installations" defines the characteristics of the cable tray product.
The standard IEC 61537 Click HERE for Certificate
|This standard defines the configurations of the mechanical tests to be carried out on the cable tray, brackets, hangers and other accessories. It also specifies the requirements and methodologies for the electrical continuity tests that the cable trays and couplers must meet.|
All mechanical and electrical performance levels of the Cablofil® range are tested according to the methods described in this standard.
The CE marking
The standard IEC 61 537 is the "product" standard defining the requirements and test methods for the cable tray and cable ladder systems. Being the only standard harmonized at European level, it is the reference when marking CE on the products, as requested in the LVD.
All Cablofil® cable trays and accessories now comply with the European standards. The products are therefore marked with the CE logo.
The following directives apply to the cable tray:
- The Low Voltage Directive 73/23/CEE known as "LVD"
- Directive 93/68/CEE known as "CE Marking"
The "CE Marking" directive
Directive 93/68/CEE, known as the "CE Marking" Directive, modifies the Low Voltage Directive for issues concerning the conformance evaluation and marking procedures.
The "LVD" directive
The low voltage directive (LVD) 73/23/CEE harmonises the legislation of member states and covers consumer and capital goods intended for use within the following voltage limits:
- 50 to 1000 Volts AC.
- 75 to 1500 Volts DC.
Difference between a directive and a standard
A directive defines the requirements related to the effects of the products on property and persons, but it does not explain in direct terms how to comply: this is the function of standards.
Special case of the EMC
The EMC Directive 89/336/Cee applies exclusively to the active elements (is carrying a current or to which a voltage is applied).
Since, by definition, the cable tray is a passive element, this directive is therefore not applicable.
Correctly connected to the earth network, however, the metal cable tray plays a positive role in the correct EMC of the installation.