syed rafiudeen


{ City } neyveli
< Country > india
* Profession * engg.
User No # 4856
Total Questions Posted # 0
Total Answers Posted # 3

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Questions / { syed rafiudeen }
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Answers / { syed rafiudeen }

Question { National Engineering Industries, 22774 }

How would we calculate the no of earthing pits required
for motor /panel


Answer

18. The GI conductor sizes shall be as listed below.

(1). HT switchgear, structures, cable trays & fence, rails,
gate and steel column
50 X 6 mm

(2). PCC & MCC EARTH PITS
50 X 6 mm

(3). DB
25 X 6 mm

(4). Motor rated above 55 KW & above
50 X 6 mm

(5). Motor rated above 22 KW & up to 55 KW
40 X 6 mm

(6). Motor rated above 5.5KW & up to 55KW
25 X 6 mm






(7). Motor rated up to 5.5 KW
8 SWG. GI wire

(8). Lighting panels & local panel
25 X 6 mm

(9). Control & relay panel
25 X 6 mm

(10). DG frame, excites
50 X 6 mm

(11). DG & TX’mer neutral
50 X 6 mm cu flat

(12). TX’mer body
50 X 6 mm

(13). Push button station
8 SWG. GI wire

(14). Receptacles & welding outlets
8 SWG. GI wire

(15). Lightning Arrestor
25 X 3 mm copper

(16). PLC & WF panels
25 X 3 mm copper

Is This Answer Correct ?    16 Yes 5 No

Question { Havells, 182775 }

How to calculate the current carrying capacity of
electrical cables


Answer

Current carrying capacity = FLC / DF
To refer cable catelouge choose the cable sizes
-Derating factor (DF) =0.72
-Full load current (I)= P / (1.732 x V x P.F)

Is This Answer Correct ?    123 Yes 40 No


Question { 13202 }

what is the diff b/w HP and KW


Answer

hp : the measure of rate of work .one horse power is
equivalent to lifting 33,000 pounds to a height one afoot
in one minutes .the horse power of motor is expressed a
function of torque and rpm for motor the following
approximate formula may be used

hp =txrpm /5250
t-torque (in-ib.ft),rpm- revolutin per minute
hp -horse power

kw : the watts is relatively small unit of power the kilo
watts (kw) 1,000 watts is use where large unit of power
measurement are desirable

Is This Answer Correct ?    3 Yes 1 No