Cqr state 92 Ohms per KM at 20 Celsius

You

Cqr state 92 Ohms per KM at 20 Celsius

You

Edited June 20, 200619 yr by georgahti

It is the resistance of a pair that will give you the voltage drop.

no a single core give the same results using my method

compare the tables 100ma over 100M (7 / 0.2) there within a few % of each other

Your paired method must work by having twice the resistance but half the cable length?

Whether we would get the same results through out the table?? Don

Edited June 20, 200619 yr by Mr Happy

Love it!

no a single core give the same results using my method

compare the tables 100ma over 100M (7 / 0.2) there within a few % of each other

Your paired method must work by having twice the resistance but half the cable length?

Whether we would get the same results through out the table?? Don

0,00178 * 1000 / ( 0,25 x 0,25 x pi ) = 9,065 ohms ( ! one core - end to end ! )

0,535 ohm difference most propably is caused by meter leads and two contact surfaces and meter inaccuracy..

edit: plus i expected CQR to be 0,5mm core diameter

and i seem to have decimal mistake somewhere - which propably is in copper resistance per metre @ 1mm2...

Try this posted previously.

2LRI = Volt Drop

Where:

L is the length of cable in meters

R is the resistance per meter of the cable (see table above) in ohms

I is the maximum current in Amps

(Rcore) x (l x 2) x I

where:

Rcore = resistivity of the cable per one metre

l = length of the cable

2 = 2

I = current ( U/R ) or (V/R there at the island)

i notice some similarities...

drop = A x cable lenght x 0.08 x 2

but only now i got this.. was wondering for a long time from where did you get that 0.08 and A (was expecting I for amperes..)