what is derating factor in Cable ? how we minimise this?
Answer Posted / kaustav bhadury
Answer 9 is the most comprehensive...
U get loads of standards based on the country u r in..
If in duct-
1) Soik Thermal resistivity : Basically the max temp in the
surrounding. 40*C is the standard.
2) Conductor grouping : Due to arrangement of multiple
conductors there is a development of an EM field which
opposes the flow and thus we need to consider this factor.
3) Temp. Derating Factor : In this the arrangement of cables
in a conduit is of prime importance. It should be in such a
way that all cables have a minimum space to dissipate heat
into the surroundings. The cables can touch each other but
anyone cable should not be fully surrounded by other cables.
4) Burial Depth : Depends on the length below ground where
the conduit is laid.
Is This Answer Correct ? | 12 Yes | 3 No |
Post New Answer View All Answers
how single phase preventer works ?
What is notching in dc machine?
How many double suspension hardware fittings are required on a double circuit transmission tower?
what is load despatching
typically in power distribution substation. 1- Any idea how would be the graph of capacitor bank consumption verses time through the day . 2- How is the switching ( on and off ) of the capacitor bank, per need?
where does 22kv line starts
What is Diff btw Fire Alarm & VESDA System???
State any two nuclear power stations in India, with their generating capacity.
Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core
What is meant by cold loop test in instrument
Why IR value of the (HT cable Plus synchronous motor) is less while individually having IR values in GΩ?
What is the problem of internal failure in ship engine telegraph system norcontrol?
Can XLPE/SWB/PVC (P3) 7C X 2.5mm2 be replaced by Can XLPE/SWB/PVC (P2) 7C X 2.5mm2??? P3 vs P2
List the characteristics of filter?
how can we make cable shedule for controll wiring ? which details must be required for it.?