Rated line-to-line voltage

The rated voltage of a cable is limited to the choices below. However, when laid in a project, the operating voltage of every cable system can be chosen arbitrary but no higher than $U_m$

$U_n$ is the rated line-to-line voltage of the cable
$U_m$ is the highest voltage for the equipment
$U_0$ is the test voltage

For DC cables, e.g. in PV installations, the highest voltage of equipment is 1.5 · $U_m$ according to DIN VDE 0298-3.
$U_m$ will increase as follows: 440→660 V, 500→825 V, 825→1238 V, 1 kV→1.8 KV, 3 kV→5.4 kV.

Symbol

$U_n$

Unit

Related

$U_0$

Base voltage for tests [kV]

$U_m$

Highest voltage for equipment [kV]

Used in

$SIL$

Surge impedance loading [MW]

Choices

$U_n$	$U_m$	$U_{mDC}$	$U_0$	Standard
208 V	240 V		120 V	USA, Canada
400 V	440 V	660 V	230 V	DIN VDE 0298-3
480 V	600 V		277 V	USA, Canada
500 V	550 V	825 V	300 V	DIN VDE 0298-3
750 V	825 V	1238 V	450 V	DIN VDE 0298-3
1 kV	1.2 kV	1.8 kV	0.6 kV	IEC 60502-1 Ed.2.1
3 kV	3.6 kV	5.4 kV	1.8 kV	IEC 60502-1 Ed.2.1
6 kV	7.2 kV		3.6 kV	IEC 60502-2 Ed.3.0
6.6 kV	7.2 kV		3.8 kV	HD 620 S2:2010 Part 1
10 kV	12 kV		6 kV	IEC 60502-2 Ed.3.0
11 kV	12 kV		6.35 kV	UK & Commonwealth
15 kV	17.5 kV		8.7 kV	IEC 60502-2 Ed.3.0
20 kV	24 kV		12 kV	IEC 60502-2 Ed.3.0
22 kV	24 kV		12.7 kV	HD 620 S2:2010 Part 1
25 kV	30 kV		15 kV	HD 620 S2:2010 Part 1
30 kV	36 kV		18 kV	IEC 60502-2 Ed.3.0
33 kV	36 kV		19 kV	UK & Commonwealth
36 kV	42 kV		20.8 kV	HD 620 S2:2010 Part 1
45 kV	52 kV		26 kV	IEC 60840 Ed.5.0
60 kV	72.5 kV		36 kV	IEC 60840 Ed.4.0
66 kV	72.5 kV		38 kV	UK & Commonwealth
110 kV	123 kV		64 kV	IEC 60840 Ed.5.0
132 kV	145 kV		76 kV	IEC 60840 Ed.5.0
150 kV	170 kV		87 kV	IEC 60840 Ed.5.0
220 kV	245 kV		127 kV	IEC 62067 Ed.3.0
275 kV	300 kV		160 kV	UK & Commonwealth
280 kV	300 kV		160 kV	IEC 62067 Ed.3.0
330 kV	362 kV		190 kV	IEC 62067 Ed.3.0
380 kV	420 kV		220 kV	IEC 62067 Ed.3.0
400 kV	420 kV		230 kV	UK & Commonwealth
500 kV	550 kV		290 kV	IEC 62067 Ed.3.0