HomeMy WebLinkAboutOne line diagram.pdf SHORT CIRCUIT CALCULATIONS SUMMARY
#OF Isc LET
z WIRE COND. VOLTAGE #OF Isc z
EQUIP. L VOLT SIZE MAT. CONDUIT CLASS(V) CABLES C VALUE RUNS AVAILABLE f M (FAULT) THRU
a (S or T) UPSTREAM (AIC)
Fl PANEL'A' 355 240 500 A N 600 S 21,390 1 14,900 2 0 5,351 N/A Fl
UTILITY TRANSFORMER SIZE: 50 KVA
MAXIMUM AVAILABLE(SYMMETRICAL)FAULT AT THE SECONDARY: 14900 AMPS
WIRING SCHEDULE - COPPER
(2WG) (3WG)
AMPS
10,2 WIRE,GROUND 10,3 WIRE,GROUND OR 30,3 WIRE,GROUND
20 (2#12&1#12 G)3/4"C (3#12&1#12 G)3/4"C
30 (2#10&1#10 G)3/4"C (3#10&1#10 G)3/4"C
40 (2#8&1#10 G)3/4"C (3#8&1#10 G)3/4"C
50 (2#6&1#10 G)3/4"C (3#6&1#10 G)1"C
CONDUCTOR SIZES ARE BASED ON 60°TERMINATIONS LESS THAN 100A AND 75°TERMINATIONS GREATER THAN 100A.
CONDUIT SIZES ARE BASED ON NEC TABLE 4(RNC)AND TABLE 5(THHN INSULATION).
SERVICE WIRING SCHEDULE
ALUMINUM
AMPS (3W) GROUNDING ELECTRODE CONDUCTOR
10,3 WIRE W.P. M.F. C.E.C. G.RING G.ROD
300 (3-500 KCMIL)3"C #2 CU #2 CU #2 CU #2 CU #6 CU
CONDUIT SIZES ARE BASED ON NEC TABLE 4(RNC)AND TABLE 5(THHN INSULATION). '~����\\
ABBREVIATIONS: W.P.-WATER PIPE; M.F.-METAL FRAME OR STRUCTURE; C.E.C.-CONCRETE ENCASED ELECTRODE; _+`�pq0 L4.,p'�,�
G.RING.-GROUND RING; G.ROD-GROUND ROD,PIPE OR PLATE ELECTRODE i �O eeje•~eea�'`ts
c.o yMo►Rr,N•.o0�fp.
A •s2 47978 n
.p elf-
"he .
UTILITY COMPANY METER <<,x11 �i
l` /••
EXISTING UTILITY TRANSFORMER t '�.
PANEL `I 8 ,6
A iii
(N)
OM/B
EXISTING PRIMARY T F1
UTILITY FEEDER
No
300A(3W) 300A(3W) GROUNDING ELECTRODE
- 4 T CONDUCTORS SIZED PER
SERVICE WIRING SCHEDULE.\—
BLDG.STEEL I.A.W.
ONE LINE DIAGRAM N.E.C.250-52(A)(2)
WATER SERVICE I.A.W.
SCALE: NOT TO SCALE N.E.C.250-52(A)(1)
20 L.F.OF#4CU
ENCASED IN MIN.2"
OF CONCRETE. I.A.W.
N.E.C.250-52(A)(3)