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Primary UD 35kV Copper XLPE insulation Concentric Neutral LLDPE Cable

Application

Primary UD cables are used in primary distribution network systems in residential, commercial and industrial areas. They can be used in conduit pipes, underground ducts or directly buried.

Construction

Conductor: Copper, circular compressed or compacted stranded conductors
Conductor screen: Non-metallic, semi-conducting compound
Insulation: cross-linked polyethylene XLPE or TRXLPE
Insulation screen: Non-metallic, semi-conducting compound
Metallic screen: Copper wires concentric neutral is with full or one-third
Outer sheath:Sunlight resistant, LLDPE

Main Characteristics

Maximum conductor temperature in normal operation: 90°C
Emergency overload temperature: shall not exceed 130°C
Short circuit temperature (5 seconds maximum duration ): shall not exceed 250°C
Product manufacturing options: Blocking elements against the penetration of water in the metallic part for humid and wet environments.

Specification

ASTM B 8 Standard Specification for Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft
ASTM B 496 Compact Round Concentric-Lay-Stranded Copper Conductors
ANSI/ICEA S-94-649 Concentric Neutral Cables Rated 5 Through 46kV

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Conductor			Copper Neutral		100% Insulation Level				133% Insulation Level
Size	Area	Nominal Diameter	No.of Wires	Size	Nominal Insulation Thickness	Nominal Sheath Thickness	Approx. Overall Diameter	Approx. Weight	Nominal Insulation Thickness	Nominal Sheath Thickness	Approx. Overall Diameter	Approx. Weight
AWG/kcmil	mm²	mm	No.	AWG	mm	mm	mm	kg/km	mm	mm	mm	kg/km
Full Neutral
1/0	53.5	8.53	16	12	8.76	2.03	40.3	1845	10.67	2.03	43.8	2061
2/0	67.4	9.55	13	10	8.76	2.03	42.4	2135	10.67	2.03	45.9	2358
3/0	85	10.7	16	10	8.76	2.03	43.6	2530	10.67	2.79	48.9	2849
4/0	107	12.1	20	10	8.76	2.03	44.9	2983	10.67	2.79	50.2	3311
250	127	13.2	25	10	8.76	2.03	46.0		10.67	2.79	51.3
1/3 Neutral
1/0	53.5	8.53	14	16	8.76	2.03	38.7	1562	10.67	2.03	42.3	1778
2/0	67.4	9.55	18	16	8.76	2.03	39.8	1763	10.67	2.03	43.3	1986
3/0	85	10.7	22	16	8.76	2.03	41.0	2031	10.67	2.03	44.5	2254
4/0	107	12.1	18	14	8.76	2.03	43.0	2351	10.67	2.79	48.3	2671
250	127	13.2	21	14	8.76	2.03	44.1	2641	10.67	2.79	49.4	2969
350	177	15.6	18	12	8.76	2.79	49.2	3422	10.67	2.79	52.8	3690
500	253	18.7	26	12	8.76	2.79	52.2	4516	10.67	2.79	56.6	4873
750	380	23.1	25	10	8.76	2.79	58.4	6398	10.67	2.79	62.0	6726
1000	507	26.9	32	10	8.76	2.79	62.7	8020	10.67	2.79	66.2	8362

Application and case display

FAQ

What is the purpose of a metallic shield in MV and HV cables?

Longitudinal Water Blocking vs. Lateral Water Blocking?

What is the operating temperature of the cable?

Armored vs. Unarmored Cables?

Flame Retardant Cables VS Fire Resistant Cables?

Both types of cables are crucial in enhancing the likelihood of escape and survival in the event of a fire and are often confused with one another. However, there is a fundamental distinction between flame retardant cables and fire resistant cables. Flame retardant cables are engineered to inhibit the spread of fire to adjacent areas. On the other hand, fire resistant cables are specifically designed to preserve circuit integrity and ensure functionality during a fire, under specified conditions, aiding both evacuees and firefighters.

How do you calculate the minimum bending radius of cables?

The bend radius refers to the curved shape in which an electrical cable can be bent or curved without sustaining damage. To determine the minimum bend radius for cables, apply the following formula: Minimum Bend Radius = Cable Outer Diameter×Cable Multiplier. For example, if the outer diameter of a cable is 20mm, its minimum bending radius would be 20mm×6 = 120mm. Conversely, if an armored cable has an outer diameter of 30mm, its minimum bending radius would be 30mm×12 = 360mm.

What is the purpose of a metallic shield in MV and HV cables?

Medium and high voltage power cables, typically those in circuits exceeding 2kV, usually feature a shield layer made of copper or aluminum tape. Similar to their use in low voltage cables, metallic wires and tapes are employed to prevent electromagnetic interference. These shields effectively neutralize or significantly diminish the field currents surrounding the conductor or core. The capacitive and inductive charging currents induced under normal operating conditions are subsequently grounded by the metallic screen.

What is the length tolerance for cables?

The tolerance for the power cable is 0 to +0.5%. For the bare conductor, the tolerance is ±5%.

What is the application of Armored vs. Unarmored Cables?

Armored cables are suitable for use in hazardous environments, such as underground installations, areas with high moisture levels, and areas prone to mechanical damage. Unarmored cables are suitable for less demanding applications, such as inside walls or other protected locations.