The formular of how to calculate a cross sectional cable to feed an electric motor.
Examle: 15KW, 26.1A, 415V. Calculate the cable size in mm2
Answers were Sorted based on User's Feedback
Answer / shridhar awasthi
Since it's an LT cable so in this case we can't apply the min cross sectional formula A=I square root t/K.
to find out the cross sectional area for this case fist find out the Load current which is given 26.01A. so refer the Manufacture cataloge and select the appropriate cable size for full Load current.
after selecting appropriate size of cable we will have to apply the derating factor according to the laying condition.
Now multiply that derating factor to cable ampacity,so we will get actual current carrying capacity of that cable.
Now for find our the no. of runs divide full load current to actual current capacity of cable after applying derating factor,so will get no. of runs.
now calculate voltage drop. if this in the permissible limit the our selection is right and if the V.d. is beyond the the increase the size of cross sectional area or no. of turns.
In this case 4 sqmm copper wire is sufficient for Star-delta starter.
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / jinesh bhaskaran
we have to consider the type of motor starting, cable length and RPM of the motor.
According to these criteria we can select the cable from the cable manufacturer table.
Is This Answer Correct ? | 0 Yes | 0 No |
what is the difference between ac ground and dc ground.. In my project iam using both ac and dc supply.. can both the grounds or the return paths be connected??
we are having 15kw and 3kw motor both can run in same time , instead of using copper we are using ug aluminium cable , 35 sq.mm is suitable for its current carrying capacity..?
0 Answers Afflatus Grauver Pvt Ltd,
what are the principles of a booster converter?
What is Antipumping Function & If we have C.T how we find the Ratio ?
In an alternator running with a balanced zero p.f. lagging load, phase differernc between the resultant armature flux and main field flux is always____? options is 180 degree....why?? explain.
cable tray sizing & selection
How to measure the capacity/rating of a distribution transformer in KVA?
what is a starter ??
To prove the capacity of a 10MVA transforemr with 6.5% impedance by a short circuit test how much power is needed to inject an impedance voltage if we have to arrive for its rated current?
mention the earthing system as per BIS?
What is Electrical Engineering?
13 Answers L&T, NTPC, Wockhardt,
Can we use same copper cable for both AC & DC power.