How to Choose the Right Power Cable for Industrial and Distribution Projects

To choose the right power cable, confirm the voltage class first, then check load current, voltage drop, conductor material, insulation and sheath, installation environment, accessories, standards, and test documents. LV power cable and MV power cable are voltage categories; underground cable and armored cable are installation or structure choices. Mixing these dimensions is one of the most common causes of unclear cable specifications.

Power cables connect transformers, switchgear, distribution cabinets, industrial loads, buildings, and outdoor distribution networks. If the selected cable does not match the electrical system or route conditions, the result may be overheating, excessive voltage drop, insulation aging, water ingress, termination failure, or delayed project acceptance.

Start with Voltage Level: LV Power Cable or MV Power Cable

The first selection step is confirming whether the project needs low voltage power cable or medium voltage power cable. DELIXI LV Power Cable is used for LV distribution cabinets, building distribution, industrial equipment connections, and terminal power distribution systems. It is designed and manufactured in accordance with GB/T12706-2008, with flame-retardant performance meeting GB/T19666 requirements.

DELIXI MV Power Cable is used for transformer feeders, MV switchgear connections, industrial distribution networks, mining, metallurgy, petrochemical, transportation, and utility-related projects. It is manufactured in accordance with GB/T12706-2008 and is applicable to power transmission and distribution systems at 35kV and below.

Selection Item	LV Power Cable	MV Power Cable
Typical application	LV switchgear, distribution boxes, building distribution, industrial equipment	Transformer feeders, MV switchgear, power distribution networks, industrial and utility feeders
Key technical focus	Current capacity, flame-retardant performance, installation method, voltage drop	U0/U voltage rating, insulation level, shielding, termination, grounding, withstand test, short-circuit performance
Project risk if selected incorrectly	Overheating, unstable load operation, cabinet connection problems	Insulation breakdown, termination failure, partial discharge risk, testing failure
Typical buyer check	Rated voltage, conductor size, insulation, sheath, flame-retardant requirement	U0/U voltage rating, cable structure, bending radius, test documents, termination accessories

When a project includes both low voltage distribution and medium voltage feeders, separate the cable list by voltage level before requesting a quotation. This helps DELIXI confirm cable structure, conductor type, insulation system, accessories, and test requirements more accurately.

Review MV Power Cable Ratings and Operating Conditions

For medium voltage systems, the voltage rating, temperature limit, bending radius, conductor resistance, and withstand test should be checked before ordering. DELIXI MV Power Cable covers U0/U rated voltage options including 3.6/6kV, 6/6kV, 6/10kV, 8.7/10kV, 8.7/15kV, 12/20kV, 18/30kV, and 21/35kV.

The long-time working temperature of the conductor should not be higher than 90°C. Under short-circuit conditions, with a maximum duration of 5 seconds, the highest conductor temperature should not exceed 250°C. During installation, ambient temperature should not be lower than 0°C unless the cable is preheated.

MV Cable Parameter	DELIXI MV Power Cable Reference	Why Buyers Should Check It
Applicable voltage system	Power transmission and distribution systems at 35kV and below	Helps confirm whether the cable matches the project voltage class
Rated voltage U0/U	3.6/6kV to 21/35kV	Prevents mismatch between cable insulation level and system voltage
Long-time conductor temperature	Not higher than 90°C	Important for continuous operation and cable service life
Short-circuit temperature	Maximum 250°C for up to 5 seconds	Related to protection coordination and fault withstand ability
Installation ambient temperature	Not lower than 0°C unless preheated	Reduces risk of insulation or sheath damage during laying
Minimum bending radius	20D, 15D, or 12D depending on core and armor structure	Helps avoid cable damage during routing and termination
Conductor DC resistance	Complies with GB/T3956	Supports conductor quality and loss evaluation
Working frequency withstand test	3.5U0 for 5 minutes without breakdown	Supports insulation quality verification before operation

Then Check Installation Environment

After voltage level is confirmed, check where and how the cable will be installed. Indoor tray, conduit, outdoor exposure, trench, duct bank, and direct burial routes all change the selection focus. Underground cable selection should pay more attention to moisture, mechanical pressure, drainage, route marking, and maintenance difficulty.

Installation Environment	Main Cable Risk	Selection Focus
Indoor cable tray or cabinet room	Heat accumulation, limited bending space, grouped cables	Derating, flame-retardant performance, bending radius, cabinet entry direction
Outdoor exposed route	UV exposure, rain, temperature changes, sheath aging	Weather-resistant sheath, sealing, route protection, support spacing
Underground trench or duct bank	Moisture, soil pressure, water accumulation, difficult maintenance	Moisture resistance, armored protection, cable route marking, drainage condition
Industrial plant area	Oil, chemical corrosion, vibration, mechanical impact	Sheath material, armored structure, cable protection, maintenance access

Check Conductor, Current Capacity, and Voltage Drop

Copper power cable provides higher conductivity and can usually carry the same current with a smaller cross-section than aluminum. Aluminum power cable is lighter and often more cost-effective for long-distance or large cross-section feeders, but termination compatibility, oxidation treatment, tightening quality, and thermal expansion must be checked carefully.

Cable size should not be selected only from a catalog current rating. Ambient temperature, grouped cables, conduit or tray ventilation, soil thermal resistance, load type, and future expansion may all require derating. For long routes, voltage drop should also be calculated from load current, cable length, conductor resistance/reactance, power factor, and allowable load-end voltage.

Technical Check	What to Confirm	Procurement Impact
Load current	Continuous current, starting current, diversity factor, future expansion	Determines conductor cross-section and safety margin
Derating factors	Ambient temperature, grouped cables, tray or conduit condition, soil thermal resistance	Prevents selecting a cable that looks sufficient in a catalog but overheats on site
Voltage drop	Cable length, conductor resistance/reactance, power factor, allowable load-end voltage	Reduces motor starting problems, unstable equipment operation, and energy loss
Short-circuit withstand	Fault current, protection clearing time, conductor size, insulation temperature limit	Helps ensure the cable can withstand fault conditions before protection operates

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Select Insulation, Sheath, and Fire Safety Requirements

Insulation and sheath should match voltage level, temperature, fire safety, moisture, sunlight, oil, chemical exposure, and abrasion risk. For LV distribution, buyers should check rated voltage, conductor size, flame-retardant performance, sheath durability, and cabinet compatibility. For MV systems, insulation level, shielding, grounding, termination quality, and withstand testing are more critical.

DELIXI MV Power Cable includes flame-retardant XLPE insulated cable options that comply with GB/T19666-2005 requirements. Low-smoke and low-halogen cable, or low-smoke halogen-free cable, should be considered for tunnels, transportation systems, public buildings, industrial facilities, and safety-sensitive areas.

Fire Safety Requirement	DELIXI MV Cable Reference	Where It Is Often Considered
Flame-retardant cable	Clustered burning test requested by GB/T19666-2005	Industrial plants, buildings, cable trays, and distribution rooms
Low-smoke and low-halogen cable	HCL content from burning gas not higher than 100mg/g	Projects concerned about smoke and corrosive gas during fire conditions
Low-smoke halogen-free cable	Burning gas water solution pH higher than 4.3 and conductivity lower than 10s/mm	Tunnels, transport systems, public buildings, and safety-sensitive facilities

When Should You Use Armored Power Cable?

Armored power cable should be considered for underground installation, direct burial, outdoor routes, industrial plants, mechanically exposed areas, and routes with difficult maintenance access. If the cable is installed in a protected conduit, indoor tray, or controlled cabinet room, non-armored cable may be easier to install and more economical.

For MV power cable, armored or non-armored structure also affects bending radius. DELIXI MV Power Cable specifies different minimum bending radius values according to single-core or three-core structure and armored or non-armored design. This should be checked before routing and termination.

Match the Cable with Equipment and Accessories

Power cable selection should be checked together with the equipment at both ends. A cable used for a distribution transformer connection must match voltage level, current capacity, termination type, grounding requirement, and cable route. A cable used with MV switchgear must also match cable compartment size, phase spacing, termination structure, and testing requirements.

Cable accessories should be confirmed before purchase. Terminations, joints, lugs, glands, heat shrink accessories, cold shrink accessories, and sealing components must match cable size, voltage level, conductor material, equipment entry dimensions, and installation environment.

What DELIXI Can Support

For project-based procurement, DELIXI can review LV or MV voltage class, load current, conductor material, cable structure, armored or non-armored requirement, route condition, accessory matching, and required test documents before quotation. This helps buyers avoid unclear specifications and reduce repeated technical communication.

Power Cable RFQ Checklist

To receive a more accurate quotation, prepare these details before asking for a power cable offer:

1.Application, such as factory distribution, transformer feeder, MV switchgear connection, underground route, or outdoor distribution.

2.System voltage and required cable voltage rating, especially for medium voltage projects.

3.Load current, cable length, expected voltage drop limit, and possible future load expansion.

4.Conductor material preference, such as copper or aluminum, and required cross-section if already designed.

5.Installation method, including cable tray, conduit, trench, duct bank, direct burial, or outdoor exposure.

6.Armored or non-armored requirement, plus any mechanical impact or underground protection needs.

7.Insulation, sheath, flame-retardant, low-smoke, low-halogen, or halogen-free requirements.

8.Required standards, test reports, project documents, packaging, drum length, and delivery schedule.

9.Cable accessories, such as terminations, joints, lugs, glands, and sealing components.

Conclusion

The right power cable should match voltage level, load current, conductor material, insulation system, installation environment, bending radius, accessories, standards, and project documents. Buyers should first confirm LV or MV voltage class, then review installation environment and structural protection needs.

DELIXI LV Power Cable and MV Power Cable support different industrial and distribution applications. Project buyers can contact DELIXI with voltage, current, route length, installation method, and accessory requirements for selection and quotation support.

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Planning an industrial or distribution power cable project?

Contact DELIXI with your voltage level, route length, installation method, current requirement, and accessory needs.

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