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Laying Conditions for Power Cables
As laying depth, the mathematical distance to the cable axis - for triangular bunched laying the distance of the bundle axis to the ground surface with 70 cm is chosen. With increased laying depth the load ratings will be mathematically reduced. Hereby the same temperature and the same thermal earth resistance are to be presumed. Normal operation conditions and indications for deviating operation conditions:
Normal Operating Conditions
Laid in ground
Laid in air
1 Multi Conductor Cable
1 Multi Conductor Cable
1 Single Conductor Cable in direct current system
1 Single Conductor Cable in direct current system
3 Single Conductor Cables in 3-phase system, side by side, with a space of 7 cm / 2.76"
3 Single Conductor Cables in 3-phase system, side by side, with a space of a cable Ø
3 Single Conductor Cables in 3-phase system, in bundle form
3 Single Conductor Cables in 3-phase system, in bundle form
Bedding in ground and if necessary covering with bricks, cement plates or coverings made of plastic
Laid in open air, i.e. unhindered heat radiation will be ensured at: Distance of cable from wall, floor or ceiling ≥ 2 cm / 0.79"
Ambient conditions
Ground temperature at installation depth:
20°C
Soil-thermal resistance
of moist area:
1.0 K x m/W
Soil-thermal resistance of dry area:
2.5 K x m/W
Connecting and Grounding
of metal jackets or shielding on both ends
For cables laying side by side: Space at least two times of the cable ø
For cables laying one above the other:
Vertical space of the cable at least two times of the cable ø
cable length at least 30 cm
Consideration of thermal loss in cable, the increased air temperature of sufficient big and ventilated rooms
Protection against direct heat radiation of sunlight etc.
Air temperature 30°C
Adequate big or ventilated rooms, due to that the power loss of the cable not be noticeable increased
Connecting and Grounding
of metal jackets or shielding on both ends
Conversion factors for laying in earth:
covering hood with air cavat y = 0.9
laid in conduit = 0.85
Conversion factors
for laying in air:
alternating ambient
temperatures
as of collecting laying
conditions
for laying in conduits
see tables and
indications according
to DIN VDE 0298
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 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. Coming Soon: 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 Connectors (M16, M23, RJ45, M27 and M40) Sizes: M16 Signal, M23 Signal & Power, M27 Signal, M40 Power 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.
Industrial 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 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 Approvals: RoHS, Deca BDE, UR, German Lloyd, CE, etc.
Hazardous 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 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
Thread Adapters, Enlargers, Reducers
Convert, Increase or Decrease your thread size with our product lineof 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.
All-weather, Rubber & Welding
Liquid Tight Strain Relief Fittings, Cord Grips, Cable Glands
Circular Connectors (M16, M23, RJ45, M27 and M40)
Industrial Enclosures (Plastic & Metal)
Conduit System
Hazardous Location / Explosive Proof Cord Grips, Cable Glands
Thread Adapters, Enlargers, Reducers
Cable Accessories