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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

Multi Conductor Cables

1 Multi Conductor Cable

Multi Conductor Cables
1 Single Conductor Cable in direct current system Single Conductor Cable 1 Single Conductor Cable in direct current system Single Conductor Cable
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 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, 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 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 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

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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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