Interested to Buy Any Domain ? << Click Here >> for more details...
what is derating factor in Cable ? how we minimise this?
- 18 Answers
- 119231 Views
- Bhel, College School Exams Tests, I also Faced
- E-Mail Answers
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
What is fault clearing time for Current Limiting Moulded Case Circuit Breaker?.
What is the IS standard for MCCB to be use (As per capacity of AMP)& for ACB also.
which connection is safer series or parallel?usually which connection we prefer at home?
if in 3-phase system voltage=440V,frequency=60Hz, current=400A. then if it is single phase then current=? and if it is single phasing then current=?
(1)Can earth and be conected together (2) what is the diferent between earth & neutral
anyone please send transformer parameter design formulas & details of tap changer ? plz i have interview this week its more helpful for me ?
In a synchronous motor. if start is running at high speed. What will be the starting torque : Higher Lower Zero
why the value of k is more in shell typr transformers?
In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?
we are going to install a solar PV site and how can we calculate PV Solar Panel Efficiency, can anybody tell me complete method for its calculation.
How do we arrive at selecting reactive capacitance value as 30% of h.p rating of motor?
Give idea about General Engineering. From which book i can study this topic. Pl. reply me via email. My email is ravi@bhelhwr.co.in, also give the name of book/website, from where i can prepare it.
1 hp is equal to how much watt?
What are gain margin and phase margin?
What is the importance of earthing?
