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Current Ratings - Conversion Factors: for grouping of single conductor cables or cables on troughs and trays

Number of 3-phase systems with single conductor cables Used as multiplier for ratings value for Number of troughs or trays 1 2 3
Installation Method Conversion factors
Perforated cable trough with contact
installation on perforated cable trough
3-conductor cables in horizontal surface arrangement 1 0.98 0.91 0.87
2 0.96 0.87 0.81
3 0.95 0.85 0.78
with contact
installation on perforated cable trough
3-conductor cables in vertical surface arrangement 1 0.96 0.86 -
2 0.95 0.84 -
Cable trays with contact
installation on cable trays
3-conductor cables in horizontal surface arrangement 1 1.00 0.97 0.96
2 0.98 0.93 0.89
3 0.97 0.90 0.86
Perforated cable trough installation on perforated cable trough 3-conductor cables in vertical surface triangle arrangement 1 1.00 0.98 0.96
2 0.97 0.93 0.89
3 0.96 0.92 0.86
installation on perforated cable trough 1 1.00 0.91 0.89
2 1.00 0.90 0.86
Cable trays installation on cable trays 1 1.00 1.00 1.00
2 0.97 0.95 0.93
3 0.96 0.94 0.90

Note: The conversion factors are only used for cables of one layer grouping arrangement. These are not valid when the cables are installed one upon anoter with contact, or when the given sprees between cable toughs or cable trays are not followed. In those cases the conversion factor can be reduced.
In parallel current circuits each group of three conductors of the parallel circuit is regarded as single circuit.
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Sealcon is the Exclusive Importer of HUMMEL products. We offer over 6,000 different Types and Sizes of RoHS Compliant Liquid Tight Strain Relief Fittings, Cord Grips, Cable Glands, Circular Connectors, Conduit System, Industrial Enclosures and Other Related Cable Management Products which are rated the best in the industry.
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