metric cables 2

[ARenko]

I've seen a number of metric cable constructions listed as 4x16/16, 4x50/25, or similar. I understand 4 is the number of cores and one of the two numbers represents mm^2, but which one, and what is the third number? I assume this identification comes from an industry standard - which one?

 

[tonyjony]

The first number is the phase conductor size (3 of the 4 cores)and the second one is the neutral conductor size (both in mm^2)

 

[slavag]

Hi.
It's size of grounding (neutral)core.
for example other indetification 3x50+25, that mean
phase core 50mm^2, 25mm^2 for neutral.
Best Regards.
Slava

 

[7anoter4]

I think this symbol is not standard one. As Slava said 4*16 or 3*50+25 is still better.
Usually for 0.6/1 KV cable the 4th digit is neutral conductor.
For medium voltage- for instance- 3*240/35 [6/10 kV] 35 sqr.mm is shield cross section.
According to DIN/VDE 0271; 0276 ;0292 ; 0295 [and other] the full identification symbol of cable include also other details as insulation and jacket material and other.
Example: NA2XS2Y 1x35 RM/16 6/10 kV
Single core XLPE-insulated cable with PE-sheath according to standard, circular, stranded aluminum conductor with nominal cross section 35 mm2, covered with copper-screen 16 mm2 and rating voltage (U0/U) 6/10 kV