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Current Carrying Capacity & Operating Conditions and Capacity of Power Cables and Wires

The guidelines for current carrying capacities of copper and aluminum are valid DIN VDE 0298 part 4 as well as DIN VDE 0276 part 603 and for the conversion factors DIN VDE 0276 part 1000.
The current carrying capacity of a cable should limited in such a degree that at all locations in a cable system which causes the generated heats under given proportions to lead safely in the environment. The heat flow depends on the inner heat-resistance between conductor and outer surface of the cable and as well as from the heat emission to the surroundings.
The following recommended values are the current carrying capacity of cables for laying in earth and in air at normal operating conditions. Hints for the deviated operating conditions, see DIN VDE 0298 table 4 and DIN VDE 0276 part 603 and part 1000.

Operating Conditions & Capacity
For laying in ground

  • Deviating operating conditions with both conversion factors are to be considered, as these depend on both of specific heat-resistance and the grade of load.
  • VU-load (load grade) is the maximum load factor of 0.7. The conversion factors for the load grades 0,5, 0,6, 0,85 and 1,0 are to be taken in tables DIN VDE 0276 part 603 and part 1000. Intermediate values can be interpolate (1.0 used for permanent load).
  • Laying depth 0.7 m. The load capacity decreases with increasing of the laying depth. Usual depth for laying is 0.7 to 1.2 m.
  • As normal value of the specific ground thermal resistance in moist areas is selected with 1.0 K x m/W. For dry areas the chosen value is 2.5 K x m/W, under consideration of the applied usual bedding materials of sands.
  • For favorable ground conditions or with thermal resisted bedding materials, lower value under well consolidation can be achieved. For individual case, the values and upon that the resulted current carrying loads are to be determined.
For laying in ground
  • The values stated in the tables for outdoor installation defined for permanent operation.
  • The arrangement of the cables is corresponded the presentation in table 3, DIN VDE 0276 part 1000.
  • Conversion factors for other laying conditions and the heaping of cables are shown in table 10 and 11, DIN VDE 0276 part 1000.
  • The current carrying capacities of multi-conductor cables can be calculated by using the current load value for 3-conductor cables according to table 13 with help of the conversion factors.
  • By using the cable channels or cable board under-lays etc. the air temperature will be increased. In this case the conversion factors according to table 12 for deviating air temperature should be used.
  • For outdoor installation, the ambient temperature is 30° C.

  • Radiation of heats and solar influence must be taken into consideration, where a good air circulation is needed.
  • A sufficient large distance is to retain between the cables and the heating elements, because badly insulated heating elements often raise additionally the temperature of the cable.
  • Distance between the cable from the wall, floor or ceiling                    =  2 cm
  • Distance between the cables being laid one above the other               =  2 x D
  • Distance between the cable systems being laid one above the other    = 20 cm
  • Distance between the cables being laid side by side                           =  2 x D
  • Specific ground thermal resistance
    - very moist area      = 0.7 K x m/W
    - moist area             = 1.0 K x m/W
    - dry area                = 2.0 K x m/W
    - very dry area         = 3.0 K x m/W
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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.
Liquid Tight Strain Relief, Cord Grips, Cable Gland FittingsLiquid Tight Strain Relief Fittings, Cord Grips, Cable Glands
Threads: PG, NPT, Metric, BSPP Threads
Materials: Nylon, Nickel Plated Brass, PVDF (for chemicals and extreme temperatures) & Stainless Steel, NEMA 4x and 6 (IP68, IP 69K).
Approvals: RoHS, Deca BDE, UR, UL, CE, CSA, VDE, German Lloyd, etc.
UL f1 (UL 746C) - Suitable for outdoor use with respect to exposure to ultraviolet light, water exposure and immersion in accordance with UL 746C
Circular ConnectorsCircular Connectors (M16, M23, RJ45, M27 and M40)
Sizes: M16 Signal, M23 Signal & Power, M27 Signal, M40 Power, M12/16 Twintus
Types: Twintus, RJ45 Industrial Ethernet, PoE Fast Ethernet, Push-Pull, Stainless Steel, Over Molded Cordsets, Standard/EMI Ready
Configurations: Signal (3-28 pole) & Power (6 & 8 pole)
Materials: Nickel Plated Brass, Stainless Steel and Aluminum
Approvals: RoHS, Deca BDE, UR, UL, CSA, TÜV, etc.
Hummel EnclosuresIndustrial Enclosures (Plastic & Metal)
Materials: Polycarbonate, ABS (Acryl-Butadiene-Styrene), Aluminum, Steel/Stainless Steel and Polyester.
Types: Gray or Transparent Lids, available with Hinges and Latches, Plain Walls or Knockouts.
Approvals: RoHS, Deca BDE, UL, CSA, TUV and CE. Modular, Expandable, UV and Impact Resistant, NEMA 4, 4x (IP 66/67). Solar Plus for Photovoltaic applications.
Our Enclosures can be equipped with Strain Relief Fittings, Circular Connectors or Conduit Fittings. Other customization options like cutting & drilling are also available.
Conduit SystemConduit System
High Pull-Out Resistance, Robust Performance, Long Life Expectancy, Fastest/ Easy installation, No Tools required!
Fittings:
Push-In, Turn-to-Seal, Snapclic DUO (Nylon or Nickel Plated Brass), Double-Seal, Flange/Bulkhead
Conduit:
Standard and Super Flex Corrugated Conduit
Accessories: Snap-In Mounting Brackets. NEMA 4 (IP 54/65)
Approvals: RoHS, Deca BDE, UR, German Lloyd, CE, etc.
Hazardous Location / Explosive Proof Cord Grips, Cable GlandsHazardous Location / Explosive Proof Cord Grips, Cable Glands
These fittings are labeled and approved to withstand the required needs of a combustible environment.
Materials: Nylon, Nickel Plated Brass, PVDF (chemical resistant & extreme temperatures), Stainless Steel.
Threads: NPT, Metric & PG. NEMA 4x (IP 67) and 6 (IP 68/69K)
Approvals:
RoHS, Deca BDE, UL, CSA, VDE, CE, EEx e, ATEX, German Lloyd, IECEx,
Ex-d/Ex-e, Ex-i
EXIOS - High-end Cable Glands for armored cables in hazardous areas including the latest IECEx and ATEX certifications, for use in Ex-e, Ex-d and Ex-tD areas
Adapters, Enlargers, ReducersThread Adapters, Enlargers, Reducers
Convert, Increase or Decrease your thread size with our newest product line of Adapters, Enlargers and Reducers.
Threads: NPT, Metric and PG.
Materials: Black or Gray Nylon, Nickel Plated Brass, Aluminum, Stainless Steel.
Approvals: RoHS, Deca BDE, CE, EEe x, ATEX, etc.
Hazardous / Explosive proof versions available.
Cable AccessoriesCable Accessories
Locking Nuts:Black & Gray Nylon, Nickel Plated Brass, Zinc Plated Steel, EMI (w/ Cutting Edges)
O-Rings: Buna-N, Viton®, Silicone
Seal Rings: Polyethylene / Fiber-reinforced Plastic
Hole Plugs: Dome, Hex, Nylon, Nickel Plated Brass
Inserts: Standard, Reduced, Multi-Hole, Romex®
Other Accessories: Ratchet & Socket Wrenches, Cable Clamps, etc.
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