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Why URD Cable Uses Aluminum Conductors: The Smart Choice for Underground Power

URD cable operates at 600V, which is low-voltage secondary distribution. In such systems, high current flow necessitates conductors with a large cross-sectional area.

While aluminum has a higher electrical resistivity than copper, this is easily compensated for in URD applications by slightly increasing the conductor’s size.

Since URD cables are inherently large-diameter cables, aluminum conductors readily meet all voltage drop and ampacity requirements.

Application Selection: Which Cable to Use Where?

Choose H07V-R (PVC) for:

General-purpose fixed wiring in dry industrial or commercial buildings​ with good ventilation.

Cost-sensitive projects​ where fire/smoke regulations do not mandate LSZH.

Applications with no public access, low occupancy, and where evacuation is straightforward (e.g., warehouses, some factory areas).

Routine residential or light commercial installations​ where local codes permit.

Choose H07Z-R (LSZH) for:

Public & Crowded Spaces:​ Shopping malls, hospitals, schools, hotels, theaters, airports, and subway stations.

Confined/Poorly Ventilated Areas:​ Cable tunnels, shafts, ships, submarines, aircraft, underground rail, and any enclosed space where smoke would accumulate.

Critical Infrastructure:​ Data centers, telecom exchanges, control rooms, power substations, and high-rise building risers.

DC Cable vs. AC Cable in Solar PV Systems Application

1.PV DC Cable:

Application:​ Used for connecting solar panels in series, combining strings in parallel, and running from DC combiner boxes to the inverter. It is designed for outdoor use​ and must have excellent UV, ozone, and temperature resistance.

Common Spec:​ For residential systems with string inverters, 4mm² DC cable​ is typically sufficient. Our standard product for this is the highly durable, irradiated cross-linked polyolefin insulated cable (H1Z2Z2-K).

2.PV AC Cable:

Application:​ Used for connections from the inverter to transformers, distribution panels, and the main grid. Mostly installed in indoor or protected environments.

What is SER Cable?

SER stands for Service Entrance Cable, Style R, where “R” denotes its Round​ shape reinforced with a tape layer. It is a key member of the Type SE cable family, designed specifically for overhead or above-ground​ power service entry applications, contrasting with the flat-style SEU cable.

Key Standards & Ratings:

Primary Standards:​ Complies with UL 854, ASTM B800/B801/B836, and the National Electrical Code (NFPA 70, NEC).

Voltage & Temperature:​ Rated for 600V and a maximum operating temperature of 90°C in both wet and dry locations.

Conductor Insulation:​ Typically features XHHW-2-rated cross-linked polyethylene (XLPE) insulation for superior durability and heat resistance.

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