Does anybody know where I can get some "hard" data on fluidized thermal concrete (aka Fluidized Thermal Backfill -FTB) for installation of underground power cable? I am familiar with the concept but I need to find more detailed information such as performance data, pricing...
anybody know how to go about calulating the emergency rating of a power cable? In other words, if you have a copper cable with a temperature rating of 75oC (or 90oC or 105oC), what is the ampacity of that cable at the emergency rated temperature of 130oC?
Can anybody point me in the right direction or give a good reference to solve the following problem/question:
How much heating (i.e. max temp) will occur in a piece of steel conduit (sleeve) due to the magnetic field produced by a large power conductor run inside of it?
Although the NEC...
Quick question:
when determining the setpoint for a instantaneous overcurrent relay for a feeder, what value of fault current is appropriate:
Should the setting be determined based on symmetrical rms, asymmetrical, or peak short circuit (three phase bolted) fault value?
Also, this value, is it...
Given the following test data:
Transformer base rating (in VA)
Transformer no-load (or iron) losses (in W)
Transformer load (or copper) losses (in W)
Transformer percent impedance (%Z)
How do you determine %X & %R values?
some confusion on my part...is it:
a) load losses/rating x 100 = %R
or...
Is there an acknowledged method/calculation/table/curve for deriving the X over R ratio of any given generator? This value is needed for computer modeling of the generator (specifically, steam or gas turbines for my apps), but is not always included or available from the vendor (esp. during the...
