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electrical estimating and costing
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PROBLEM
Wiring, Estimation and Costing of PHARMACY BLOCK (first floor).
ASSUMPTIONS
(a) Total height of ceiling from floor = 4 mts(b) Height of horizontal run from floor = 2.5 mts(c) Height of SB’s and MB from floor = 1.5 mts(d) Height of bed side switch board from floor=1.5mt.(e) Bakelite switch and main board are to be used.
Plan Of The Block
SYMBOL USED:
1
.
Socket Outlet 15 ampere
2
.Socket Outlet 5 ampere
3
.Exhaust Fan
4
. Fluorescent Lamp
5
.Distribution switch board without switches ‘Power’
LOAD CALCULATION:
1. LH-1, LH-2, LIBRARY and COMP. LAB controls from control room.
Total load of these rooms are as follows:
Sr. no.
Name of appliance Numbers Load (watts)
1 Tube lights 29 29*40=11602 Ceiling fans 22 22*60=13204 Exhaust 2 2*100=2005 5-amp socket 5 5*100=500
TOTAL LOAD= 1160+1320+200+500=3180 WATTS
TOTAL NO. OF SUB- CKTS=3180/800=4
Hence total MCB of rating 6 amp= 4+2(future expansion)=6
PER PHASE LOAD=3180/3=1060 W
LINE CURRENT= 1060/230/0.8=5.76 AMP.
So 4 sq.mm 1 /2.24 mm dia Al, single core, pvc insulated cable will be used.
2.) LOAD ON MSB-1
Sr. no.
Name of appliance Numbers Load (watts)
1 Tube lights 12 12*40=4802 Ceiling fans 9 9*60=5405 5-amp socket 5 5*100=500
TOTAL LOAD=480+540+500=1520 W
TOTAL NO. OF SUB-CKTS=1520/800=2
Hence total MCB of rating 6 amp=2+4(for future)=6
Per phase current=1520/3/0.8/230=2.75 amp.
So 4 sq.mm 1 /2.24 mm dia Al, single core, pvc insulated cable will be used
3.) LOAD ON MSB-2
Same as MSB-1.
4.) LOAD ON MSB-3
Sr. Name of appliance Numbers Load (watts)
no.1 Tube lights 16 16*40=6402 Ceiling fans 10 10*60=6005 5-amp socket 5 5*100=500
TOTAL LOAD= 640+600+500=1740 W
NO OF SUB-CKTS=1740/800=3
HENCE NO. OF MCB OF RATING 6 AMP= 3+3=6
PER PHASE CURRENT=1740/3/230/0.8=3.15 AMP.
So 4 sq.mm 1 /2.24 mm dia Al, single core, pvc insulated cable will be used
5.) LOAD ON MSB-4
Sr. no.
Name of appliance Numbers Load (watts)
1 Tube lights 16 16*40=6402 Ceiling fans 12 12*60=7203 5-amp socket 5 5*100=5004 15-amp socket 1 1000
TOTAL LOAD= 640+720+500+1000=2860 W
HENCE NO. OF MCB OF RATING 6 AMP= 3+1(for 15 amp. Socket)+2=6
PER PHASE CURRENT=2860/3/230/0.8=5.18 AMP.
So 6 sq.mm 1 /2.80 mm dia Al, single core, pvc insulated cable will be used
6.) LOAD ON MSB-5
Sr. no.
Name of appliance Numbers Load (watts)
1 Tube lights 6 6*40=2402 Ceiling fans 4 4*60=2403 5-amp socket 2 2*100=2004 15-amp socket 3 3000
TOTAL LOAD= 240+240+200+3000=3680 W
HENCE NO. OF MCB OF RATING 6 AMP= 1+3(for 15 amp. Socket)+2=6
PER PHASE CURRENT=3680/3/230/0.8=6.66 AMP.
So 6 sq.mm 1 /2.80 mm dia Al, single core, pvc insulated cable will be used
CONDUIT CALCULATION:
LH1
SB1 to Ceiling fan = 2.5m
Ceiling to L1 =1m
L1 to L5 =4.5m
F3 to F4 =2m
SB1 to HR =2m
L2 to L6 =4.5m
TOTAL = 17m
LH2Installation plane is same for lh1 &lh2 so conduit is same i.e 17m
LIBARARYSB to HR =1.0m
HR to L1 =2m+1m =3m
L1 to L4 =12m
For Bracket
SB2 to HR =1m
HR to L7 =1+2=3m
L7 to L5 = 8m
For bracket fan(HR) =8m
Total =54m
FOR COMPUTER LABSB to L10 =1m+2m =3m
L10 t0 L9 = 5m
L5 t0 L8 = 7.5m
F1 to F2 = 4m
HR for bracket/an = 2.5m+6m=8-5m
Total = 3.5
LAB 6SB1 to F4 =2.5m+1m=3.5m
F4 to F6 = 6m
L1 to L3 =9m
F1 to F3 = 6m
F4 to F1 = 4m
STORE:-
ST-1 SB1 to L1 = 0.5m+1m=1.5mL1 to L2 = 2.m
ST-2SB1 to F1 = 2m+1.5m = 3.5m
L3 to L4 = 2m
ST-3SB1 to F3 = 3.5m
L5 to L6 =2m
Total =43.5m
Installation table is same for LAB 6,so conduit used in LAB6 = 44m
LAB-3SB1 to Ceiling fan = 2m+0.5m=2.5m
Ceiling to F1 = 3m
F1 to F3 = 6m
L1 to L2 = 9m
F4 to F6 = 6m
F2 to F5 = 4m
TOTAL =2.5+3+6+9+6+4=30.5m
LAB-4The installation plane is same for LAB-4 is same as that for LAB-3,so conduit is same
Total conduit = 30.5m
FACULTY ROOMF-1
SB1 to HR = 2m
HR1 to L2=1.5m
L2 to L1 =1.5m
Total = 5m
All the faculty rooms have same installation plane,so the conduit used in F-1,F-2,F-3 &F-4 is same
Total conduit =5*4 = 20m
LAB-2SB1 to HR =2m
HR to ceiling = 0.5m
Ceiling to L7 = 6m
L2 to F6 =7m
L1 to L5 = 7m
L7 to F3 = 6m
Total = 28.5m
LAB-1Installation is same for LAB-2 & LAB-1,so conduit used is also same
Total =28.5m
LAB-7(Pathology Lab)SB 1 to HR = 2m
HR to ceiling =0.5m
Ceiling to L1 =2m
L1 to L3 = 5m
L4 to L6 =5m
L1 to L4 = 2m
F2 to F4 = 2m
Total = 18.5m
TOTAL CONDUIT OF PHARMACY BLOCK(1ST FLOOR) :-
17+!7+54+35+44+44+30.5+30.5+20+28.5+28.5+18.5 =367.5m
10% wastage of 367.5 = 36.7
=405m
Total conduit = 13+30+20 =63m
405+63+6.3 = 474.3m
PHASE WIRE CALCULATIONS
LH-1
From Control Room to SB1 = 4m+3m+5m+24m+2m+1.5m = 39.5m
SB1 to L1 & L2 =1.5m+0.5m+3m =5m
SB1 to L5 =1.5m+0.5m+3m+2m =7m
SB1 to F1 & F2 =1.5m+0.5m+4m =6m
SB1 to L3 =1.5m+2m+0.5m+2m =6m
SB1 to F2 & F4 =1.5m+2m+0.5m+5m =9m
SB1 to L4 & L6 =1.5m+2m+0.5m+6m =10m
Total =82.5m
LH-2
From control room to SB1 = 4m+3m+2m=11m
Total =54m
LIB-1
From Control Room to SB2=4m+3m+5m+18m+1.5m =31.5m
SB2 to SB1 =1.5m +3.5m +4m =9
SB2 to B(F5) =1.5m +1m =2.5
SB1 to L7 =1.5m+0.5m+1m =3+2=5
SB1 to L6 & L5 =5m+8m =13
SB1 to B(F4) =1.5m+10m =11.5
SB2 to L1 & L3 =1.5m+3m =4.5+1=5.5m
SB2 to L3 & L4 =1.5m+3m+1m+8m =13.5
SB2 to B(F2) & B(F1) =1.5m+2m+13m =16.5
Total = 108m
COMPUTER LAB
From Control Room To SB1=4m+3m+5m+4m+10m=26m
SB1 to L10 &L9 =1.5m+0.5m+2m+6m =10m
SB1 to L3 =1.5m+0.5m+4m =6m
SB1 to L5&L6&L7&L8 =1.5m+0.5m+6m+4m =12m
SB1 to F1 & L2 =1.5m+0.5m+6m+4m =12m
SB1 to L1 & L4 =1.5m+0.5m+7m+8m =17m
Total =85m
LAB-5
MSB2 to SB1 = 5m+2.5m+1.5 m =9m
SB1 to F4 =1.5m+0.5m+2m+1m =5m
SB1 to F5 & F6 =1.5m+0.5m+2m+6m =10m
SB1 To L1 & L2 =1.5m+0.5m+2m+6m =10m
SB1 to L3 =1.5m+0.5m+4m+9m =15m
SB1 to F1 =1.5m+0.5m+6m+1m =9m
SB1 to F2 & F3 =1.5m+0.5m+6m+6m =14m
MSB to ST1 =9m
SB1(ST1) to L1 & L2=1.5m+1.5m+1m=4+2 =6m
SB1(ST1) to F1 =1.5m+1.5m+1m+1m =5m
MSB2 to ST2 =9m+6m+2m =17m
SB1(ST1) to L3 & L4 =6m
SB1(ST1) to F2 =5m
MSB2 to SB1(ST3) =9m+10m=19+2 =21m
SB1 to F3 =1.5m+0.5m+2m =4m
SB1 to L5 & L6 =1.5m+0.5m+2m+2m =6m
Total =149m
LAB-6
Same Installation Plan, so phase wire is also same =149m
LAB-3
MSB1 to SB1 = 3m+2m+1.5m = 6.5m
SB1 to F1 =1.5m+0.5m+2m+1.5m =5.5m
SB1 to F2 & F3 =5.5m+6m =11.5m
SB1 to L1 =1.5m+0.5m+4m+1m =7m
SB1 to L2 & L3 =7+9 =16m
SB1 to F4 =7m+2m =9m
SB1 to F5 to F6 =9m+6m =15m
Total =70.5m
LAB-4
Same installation plane, So phase wire is also same in LAB-3=70.5m
LAB-2
MSB1 to SB1 =11m+1m+1.5m =13.5m
SB1 to L7 =1.5m+0.5m+7m =9m
SB1 to F2 & F4 =1.5m+0.5m+4m =6m
SB1 to L2 & L4 =1.5m+0.5m+2m+4m =8m
SB1 to L6 = 0.5m+1.5m+2m+1m+8m=13m
SB1 to L1 & L2 & L5=2m+4m+8m =14m
SB1 to F1 & F2 =2m+4m+6m =12m
Total =75.5m
LAB-1
Same installation plane, so phase wire is same as LAB-2 = 75.5m
FACULTY ROOM
MSB1 to SB1 =8+1 =9
SB1 to F1 =1.5+0.5+1+1 =4
SB1 to L1 & L2=1.5+0.5+1+2 =5
=18
18*4 =72
Total Phase wire =72
PATHOLOGY LAB:
MSB1 to SB2 =13m+13m+1.5m=26m+1.5m=27.5m
SB1 to SB2 =2m+1.5m =3.5m
SB1 to SB3 =3.5m
SB1 to L1 = 1.5m+0.5m+2m =4m
SB1 to F1 & L2=4m+3.5m =7.5m
SB1 to L2 & L3=4m+5m=9m
SB1 to L5 & L6=1.5m+0.5m+4m+2m+2m =10m
SB1 to F4 =1.5m+0.5m+4m+2m+1m =9m
SB1 to L4 =1.5m+2m+2m =5.5m
SB1 to F3 =1.5m+2m+3m =6.5m
TOTAL =86m
TOTAL PHASE WIRE
82.5m+54m+108m+85m+149m+149m+70.5m+70.5m+75.5m+75.5m+72m+86m=1077.5m
10 % waste = 107.7M
HENCE, TOTAL PHASE WIRE =1185.2m or 1190m
NEUTRAL CALCULATION
LH-1SB1 to L1 = 2.5m+1=3.5m
L1 to L5 =4.5m
F3 to F4 =2m
F4 to L6 =1m
F4 to L6 =1m
From lib = 6m 20m
LH-214m+6m = 20m
LIB-1SB to LH2 = 16m
SB to L1 =1+2 =3m
L1 to L4 =12m
SB2 to L7 = 3m
L7 to L5 = 8m
SB to BF1 = 1+1=2m
B(F1) to B(F3) =8m=52m
COMPUTER LAB:-SB(lib) to B(F7) =2m
B(F7) to L4 =2m
L4 to L1 = 7m
F1 to F2 = 4m
L5 to L8 = 7.5m
L10 to L9 = 5m
L10 to SB1 =3m
Total =37.5m
LAB-6MSB2 to F1 =2+2-5=4.5m
F1 to F3 = 6m
L1 to L3 =9m
F4 to F6 = 6m
F4 to SB1 =1m+2m+2.5m
TOTAL =31m
ST-1From SB1 to SB2(ST1) = 0.5m
SB1 to L2 =3m+2.5+5=6m
6*3 =18m
31+18=50m
LAB-5N.W=50m
LAB-3MSB2 to F1 =2.0m+2m =4m
F1 to F3 = 6m
F1 to SB1 = 2m+2.5m+1m=5.5m
L1 to L3 = 8m
F1 to F6 =6m
F1 to L1 =2m
L1 to L4 =2m
TOTAL =33.5m
LAB-4Installation is same as LAB 4 33.5m
FACULTY ROOM(F1)NW From SB1 to F1 =8m
SB1 to L2 =1.5+1+0.5m+2m =5m
F25m
F35m
F45m
TOTAL FACULTY ROOM=20m
LAB-2L2(Faculty room f1) to L2(LAB-2) =3m
L2 to L1 =2m
L1 to L5 =7m
L2 to F6 =7m
L4 to L7 =1m
L7 to SB1=7+2.5=9.5m
TOTAL=29.5m or 30m
LAB-1Same as LAB 2 TOTAL =30m
LAB-7From L7 (LAB-2) to SB1 =8m+2.5m=10m
SB1 to L3 =2m+0.5m+7m=9.5m
L4 to L6 = 5m
L1 to L6=5m
L1 to L4 =2m
Total=27m
CORRIDORConrol room+L3 =10m+3m=13m
L3 to L5 =8 m
L3 to L7 = 14m
MSB1 to L10 = 18m+1m=19m
L10 to L11 =4.5mTOTAL(NW)=20m+20+52m+37.5m+31+50+50+33.5+28+30+30+27+58.5 =467.5m
10% waste =467.5/10 =46.7
HENCE TOTAL NEUTRAL WIRE REQD. =467.5+46.7 =514m
MATERIAL TABLE
Sr. No.
Specification Quantity Rate
(Rs)
Amount
(Rs)
1. 1. 4 sq.mm 1 /2.24 mm dia Al, single core, pvc insulated cable
175M 200 35000
2 MCB distribution board
6A
With din rail and steel mounting board and other attachments
36 90/pc 3240/-
3. Iron clad main board 60x60cm with 4 rag bolts and nuts each of diameter 10x150mmlong for fixing MB with wall
6 200/pc 1200/-
4. Conduit pipe black enamel and light gauge (25mm dia)
475 8/pm 3800/-
5. Conduit pipe accessories:
1. Coduit socket to connect two pieces of conduit
2. Bends 3. Junction box(2
way)4. Junction box(3
way)
125
50
50
30
3
3
5
5
375/-
150/-
250/-
150/-
6. PVC insulated copper conductors single core 250Vgrade wire of size
1190+514= 1704m 6/m 10,224/-
1.5 mm2 or 1/1.40 dia
7 . Earth wire 14SWG, G.I. 50m 5/m 250/-
8. Machine screws 3mm dia 25mm long for fixing ceiling roses and lamps
450 2/pc 900/-
9. Machine screws 3mm dia 15 mm long for fixing Bakelite junction box cover
65 1.50/pc 97.5/-
10. Earthing set complete with pipe,GI pipe, earth wire, CI frames , CI covers, thimbles, charcoal
1 2500/set 2500/-
11. Teak wood frame and shutter door
1 550/set 550/-
12. Fan 57 1200/- 68,400/-
13. Exhaust fan 2 1000 2000/-
14. Tubelight Set 79 150 11850/-
15. 5 amp Socket 22 15 330/-
16. 15 AMP socket 4 45 180/-
17. Flush Switch 180 14 2520/-
18. Ceiling rose,Bakelite for tubes and fans
135 10 1350/-
GRAND TOTAL 1,47,316.5/-