Regulations on structure of low voltage cables

The requirements for the structure of low voltage cables are as follows:

I. Cable used to transmit voltage up to 450/750V (TCVN 6610-3, TCVN 6610-5)

1. TCVN 6610-3:2000 ( Unsheathed PVC insulated cable for fixed installation). Includes (summary):
   • Single-core unsheathed low-voltage cables with rigid conductors for general use (6610 TCVN 01 or 227 IEC 01): Rated voltage up to 450/750V, number of conductors 1 and class 1 or class 2 conductors ( solid solid conductor or stranded conductor respectively), PVC/C insulation thickness from 0.7mm, approximate outer diameter from 2.6mm, maximum conductor temperature in normal use is 70 degrees Celsius;
   • Single-core unsheathed low-voltage cable with flexible conductor for general use (6610 TCVN 02 or 227 IEC 02): Rated voltage up to 450/750V, number of conductors 1 and 5 conductors (flexible conductors) ), PVC/C insulation thickness from 0.7mm, approximate outer diameter from 2.8mm, maximum conductor temperature in normal use is 70 degrees Celsius;
   • Single-core unsheathed low-voltage cable with solid conductor and conductor temperature of 70 degrees Celsius for internal installation (6610 TCVN 05 or 227 IEC 05): Rated voltage up to 300/500V, quantity conductor 1 and conductor class 1 (solid conductor 1 solid), PVC/C insulation thickness from 0.6mm, average outside diameter from 1.9mm, maximum conductor temperature in normal use is 70 poison;
   • C Unsheathed low voltage piezoelectricity with a single core with flexible conductor and conductor temperature of 70 degrees C for internal installation (6610 TCVN 06 or 227 IEC 06): Rated voltage up to 300/500V, no. amount of conductor 1 and conductor class 5 (soft conductor), PVC/C insulation thickness from 0.6mm, average outside diameter from 2.1mm, maximum conductor temperature in normal use is 70 degrees Celsius ;
   • Single-core unsheathed low-voltage cable with solid conductor and conductor temperature of 90 degrees Celsius for internal installation (6610 TCVN 07 or 227 IEC 07): Rated voltage up to 300/500V, quantity conductor 1 and conductor class 1, PVC/E insulation thickness from 0.6mm, average outside diameter from 1.9mm, maximum conductor temperature in normal use is 90 degrees Celsius;
   • Single-core unsheathed low-voltage cable with flexible conductor and conductor temperature of 90 degrees Celsius for internal installation (6610 TCVN 08 or 227 IEC 08): Rated voltage up to 300/500V, quantity conductor 1 and conductor class 5, PVC/E insulation thickness from 0.6mm, average outside diameter from 2.1mm, maximum conductor temperature in normal use is 90 degrees Celsius.
2. TCVN 6610-5:2014 (Regulations on PVC-insulated flexible wire): The content of this low-voltage cable line is shown in the list of civil electrical wires .

II. Cable used to transmit voltage up to 0.6/1kV (TCVN 5935-1:2013)

• Nominal voltage 0.6/1 (1.2) kV;
• Insulating compound
  1. PVC thermoplastic;
  2. Cross-linked insulating compound: Ethylene propylene rubber or the like (EPR), molecular rubber or high hardness ethylene propylene rubber (HEPR), Cross-linked polyethylene (XLPE).
• The maximum conductor temperature in normal operation is 70 degrees C (if PVC insulation) and 90 degrees C (if XLPE insulation).
• Conductors: Must be class 1 (1 solid conductor) or class 2 (braided conductor) (according to IEC 60228:2004) of annealed copper/coated with aluminum or aluminum alloy;
• Regulations on the minimum thickness of each insulating compound on each product classified according to the following nominal cross-sections: 1.5 and 2.5mm2, 4 and 6mm2, 10 and 16mm2, 25 and 35mm2, 50mm2, 70mm2, 95mm2, 120mm2, 150mm2, 185mm2, 240mm2, 300mm2…