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Maximum current rating for conductor
Maximum current on insulated conductors up to an ambiant temperature of 30° C (from VDE 0100, parts 430 and 532 as well
as other VDE regulations).
Nominal
section
mm 2
0.08
0.14
0.25
0.34
0.50
0.75
1.00
Group 2
Intens.
max. A
1.0
2.0
4.0
6.0
9.0
12.0
15.0
Group 3
Intens.
max. A
1.5
3.0
5.0
8.0
12.0
15.0
19.0
1.50
2.50
18.0
26.0
24.0
32.0
Group 2 Multi-conductor, e. g. solid cable under sheath, shielded cable, lead-sheath cables, …
Group 3 Single conductor and single conductor cable laid on open air in a way to leave at least a
space between them equal to their diameter
Some formulae
Resistance R of a conductor: R = ρ
q
l
A
[ ? ]
Where: ρ = conductor resistivity
l = conductor length
A = conductor cross-section
log [ ? ]
Impedance of coaxial line:
Z =
138
√ε r
q
D
d
ε r = dielectric constant
D = dielectric outer diameter
d = center conductor outer diameter
Signal attenuation: Attenuation = 20 log
q
U 1
U 2
[dB]
U 1 = input signal voltage
U 2 = output signal voltage
Conversion of some units:
°F = °C 1.8 + 32
newtonmeter (Nm) into inch pound (in lb)
1 Nm = 8.85 in lb
mbar l s -1 into Torr l s -1
1 mbar l s -1 = 1.33 Torr l s -1
millimeters into inches:
inches into millimeters:
centimeters into feet:
feet (12 in) into centimeters:
square centimeters into square inches:
square inches into square centimeters:
bar into pounds per square inch:
bar into Pascal:
°C into °F:
q
q q q q
www.lemo.com
1 mm = 0.0394 in
1 in = 25.4 mm
1 cm = 0.0328 ft
1 ft = 30.48 cm
1 cm 2 = 0.155 sq in
1 sq in = 6.4516 cm 2
1 bar = 14.51 psi
1 bar = 10 5 Pa
q
q
q q q q
183
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