Field Installed Control Wiring - Trane RAUJ-C20 Installation, Operation And Maintenance Manual

I I n n s s t t a a l l l l a a t t i i o o n n E E l l e e c c t t r r i i c c a a l l
Power Wire Sizing and Protection Devices
Table 19. RAUJ power wire selections
Unit Size
(tons) Voltage
200/230
20, 30, 40 380/415/460
575
200/230
50
380/415/460
575
200/230
60
380/415/460
575
80 to 120 All
Table 20. Control wire selections
Units Sizes Wire
Gauge
(tons)
All 18
All 16
All 14
80 to 120 12
Table 21. Control terminal blocks
Unit Size Control Terminal Blocks
20 to 60
80 to 120
Equations
To correctly size main power wiring for the unit, use
appropriate calculation(s) listed below.
L L o o a a d d D D e e f f i i n n i i t t i i o o n n s s f f o o r r C C a a l l c c u u l l a a t t i i o o n n s s
• LOAD 1: Current of largest motor (compr or fan
motor)
• LOAD 2: Sum of the currents of all remaining
motors
• LOAD 4: Control panel transformer and any other
load rated at 1A or more
C C a a l l c c u u l l a a t t i i o o n n — — M M C C A A , , M M O O P P , , a a n n d d R R D D E E
• M M C C A A = (1.25 x LOAD 1) + LOAD 2 + LOAD 4
• M M O O P P = (2.25 x LOAD 1) + LOAD 2 + LOAD 4
66
To Disconnect Switch (1S1)
Disconnect
Size
(amps)
250
100
100
400
250
100
400
250
250
-
Max Wire
Ohms per
Length (ft)
1000 feet
8 500
5 1000
3 2000
2 3000
7TB5 thru 7TB8, 6TB9
7TB5 thru 7TB8
Terminal Block
Connector Wire
Range
(1) #4-350 kcmil
(1) #14-1/0
(1) #14-1/0
(1) #1 - 600 kcmil OR(2)
#1 - 250 kcmil
(1) #4-350 kcmil
(1) #14-1/0
(1) #1 - 600 kcmil OR(2)
#1 - 250 kcmil
(1) #4-350 kcmil
(1) #4-350 kcmil
-
Select a fuse rating equal to the MOP value. If the MOP
value does not equal a standard fuse size as listed in
NEC 240 - 6, select the next lower standard fuse rating.
N N o o t t e e : : If selected MOP is less than the MCA, then select
the lowest standard maximum fuse size which is
equal to or larger than the MCA, provided the
selected fuse size does not exceed 800 amps.
• R R D D E E = (1.5 x LOAD 1) + LOAD 2 + LOAD 4
Select a fuse rating equal to the RDE value. If the RDE
value does not equal a standard fuse size as listed in
NEC 240 - 6 select the next higher standard fuse rating.
N N o o t t e e : : If the selected RDE is greater than selected MOP
value, select RDE value to equal MOP value.
C C a a l l c c u u l l a a t t i i o o n n — — D D i i s s c c o o n n n n e e c c t t S S w w i i t t c c h h S S i i z z i i n n g g ( ( D D S S S S ) )
• DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)

Field Installed Control Wiring

H H a a z z a a r r d d o o u u s s V V o o l l t t a a g g e e ! !
F F a a i i l l u u r r e e t t o o d d i i s s c c o o n n n n e e c c t t p p o o w w e e r r b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g c c o o u u l l d d
r r e e s s u u l l t t i i n n d d e e a a t t h h o o r r s s e e r r i i o o u u s s i i n n j j u u r r y y . .
D D i i s s c c o o n n n n e e c c t t a a l l l l e e l l e e c c t t r r i i c c p p o o w w e e r r , , i i n n c c l l u u d d i i n n g g r r e e m m o o t t e e
d d i i s s c c o o n n n n e e c c t t s s b b e e f f o o r r e e s s e e r r v v i i c c i i n n g g . . F F o o l l l l o o w w p p r r o o p p e e r r
l l o o c c k k o o u u t t / / t t a a g g o o u u t t p p r r o o c c e e d d u u r r e e s s t t o o e e n n s s u u r r e e t t h h e e p p o o w w e e r r
c c a a n n n n o o t t b b e e i i n n a a d d v v e e r r t t e e n n t t l l y y e e n n e e r r g g i i z z e e d d . . V V e e r r i i f f y y t t h h a a t t n n o o
p p o o w w e e r r i i s s p p r r e e s s e e n n t t w w i i t t h h a a v v o o l l t t m m e e t t e e r r . .
To Main Terminal Block
Size
(amps) Connector Wire Range
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
(1) #6-350 MCM
335
760 (2) #4-500 MCM
W W A A R R N N I I N N G G
SS-SVX11K-EN