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Rating Conversion Factors for Installation of Medium Voltage Power Cables, 6-30 kV
for Installation in air - Multi Conductor Cables & Single Conductor Direct Current Cable

Arrangem. of cable in laying condition No. of cable troughs
or trays 		For installation on plain surface
Space = cable diameter d
Distance from wall ≥ 2 cm
Installation method Number of cables
1 2 3 4 6
On the ground 1 installation on the ground .97 .96 .94 .93 .90
On non-perforated cable troughs (restricted air circulation) 1 installation on non-perforated cable troughs (restricted air circulation) .97 .96 .94 .93 .90
2 .97 .95 .92 .90 .86
3 .97 .94 .91 .89 .84
6 .97 .93 .90 .88 .83
On perforated cable troughs 1 installation on perforated cable troughs 1.0 1.0 .98 .95 .91
2 1.0 .99 .96 .92 .87
3 1.0 .98 .95 .91 .85
6 1.0 .97 .94 .90 .84
On cable trays or cable ladders (unrestr. air circulation) 1 installation on cable trays or cable ladders (unrestricted air circulation) 1.0 1.0 1.0 1.0 1.0
2 1.0 .99 .98 .97 .96
3 1.0 .94 .97 .96 .93
6 1.0 .97 .96 .94 .91
On platform, walls or perforated cable tray 1 installation on platform, walls or perforated cable tray 1.0 .91 .89 .88 .87
2 1.0 .91 .88 .87 .85
On platform or walls - - -
Arrangements for which a reduction is not necessary1) Number of cables arranged one over another is optional Arrangements for which a reduction is not necessary
For installation on plain surface
Space = 2 x cable diameter d
Distance from wall ≥ 2 cm
Installation method Number of cables
1 2 3 4 6 9
installation on the ground .97 .85 .78 .75 .71 .68
installation on non-perforated cable troughs (restricted air circulation) .97 .85 .78 .75 .71 .68
.97 .84 .76 .73 .68 .63
.97 .83 .75 .72 .66 .61
.97 .81 .73 .69 .63 .58
installation on perforated cable troughs 1.0 .88 .82 .79 .76 .73
1.0 .87 .80 .77 .73 .68
1.0 .86 .79 .76 .71 .66
1.0 .84 .77 .73 .68 .64
installation on cable trays or cable ladders (unrestricted air circulation) 1.0 .87 .82 .80 .79 .78
1.0 .86 .80 .78 .76 .73
1.0 .85 .79 .76 .73 .70
1.0 .83 .76 .73 .69 .66
installation on platform, walls or perforated cable tray 1.0 .88 .82 .78 .73 .72
1.0 .88 .81 .76 .71 .70
installation on platform or walls .95 .78 .73 .72 .68 .66
Number of cables arranged side-by-side is optional Arrangements for which a reduction is not necessary
1) In narrow rooms for bigger grouping the air temperature is increased due to energy losses of the cable, so the additional conversion factors for deviating air temperatures can be found in the given table.
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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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