3C+ N Impedances
3C+ N Impedances
(OP)
I have values for 3C Rw90 cable , is there simple method to calculte impedances ( Positive & Zero) for 3C+N ?
2) if I have positive impedances , what s the relation between Z+ and Z0?
3) How about 3C+N + a bre ground wire
I wish it was a simple program out there with all these information, I didn''t need to look around all the time to get this data!!
2) if I have positive impedances , what s the relation between Z+ and Z0?
3) How about 3C+N + a bre ground wire
I wish it was a simple program out there with all these information, I didn''t need to look around all the time to get this data!!






RE: 3C+ N Impedances
For typical values, see the reference in thread238-241284: X and R Values
Alan
----
"It's always fun to do the impossible." - Walt Disney
RE: 3C+ N Impedances
IEEE 141 for
500 MCM Cable
in EMT
Z+= 0.0276+J0.0373
Z0=0.0438+J0.0999
per 1000ft/ohm
Insulation type : PVC
Insulation class: THHN
Nexans Cable Manufacturer
500 MCM Cable
in EMT
Z+= 0.0219+J0.0270
Z0=0.1844+J0.0326
per 1000ft/ohm
Insulation type : XLPE
There is big difference in Z0 values , I am wondering if anyone has experience calculating this values?
RE: 3C+ N Impedances
The manufacturer's data may not be considering a ground wire within the EMT.
RE: 3C+ N Impedances
Does everybody design an excel spread sheet with formulas and calculate these values?
RE: 3C+ N Impedances
In most cases, the analysis software being used will have this data in its database.
"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg
RE: 3C+ N Impedances
do you calculate cable impedances using available formulas?
SKM suggests impedances , but it greatly varies with Nexcan's suggested values!!!
RE: 3C+ N Impedances