MAINTENANCE
BYPASS INPUT
(3Ø,4W,G)
(E1-E3, E4, E5)
Notes:
3-bkr Maintenance Bypass Cabinet with SKRU (Line-up-and-match)
1
1. Maintenance Bypass Cabinet (MBC) with SKRU for SG series UPS module, 480Vac.
2. Main Breakers: MIB & MBB (xxxAT), 80% molded case, manually operated breaker.
Refer to Table 1 for breaker current rating.
3. UPS Input Breaker: UIB (xxxAT), 80% molded case, manually operated breaker.
Refer to Table 1 for breaker current rating.
4. Bus: Copper
5. Neutral: 200%
6. Aux Contact: 2A/B on MBB breaker only
7. Control: SKRU with Kirk Key on MBB and MIB breakers.
8. Equipment ground
9. 10. Refer to national electric code for acceptable external wiring pratice.
10. An upstream overcurrent protection with a maximum rating of 125% of the UPS rectifier input
must be installed at the MBC input (E1-E3).
11. Refer to Table 1 for external wiring recommendation.
The external wiring is rated at 75 °C or 90 °C.
12. The external wiring material and labor to be provided and paid by others.
13. Maintenance Bypass Input must come from a 3Ø/4W/G (wye), solidly grounded electrical system.
14. The control and power wirings must be installed in separate conduits.
15. Refer to Table 2 for control wiring from MBC to UPS module.
UIB
(xxxA)
4
(E13-E15, E4, E5)
UPS RECT./
BYPASS INPUT
(3Ø,4W,G)
TB1
-1
AUX. 1
F1-2
SKRU
-2
K1/2/3
-3
-4 AUX. 2
RECTIFIER
INPUT
(3Ø, 3W,G)
BYPASS INPUT
(3Ø, 4W,G)
-5
-6
REMOVABLE
CONNECTIONS
MBB
AUX.
5
~
K3
-
FROM BATTERY
(+, -, G)
~
K7
INVERTER
DC INPUT
(+, -)
RECTIFIER
K4
K6
K8
K2
X1
SSM
Twisted
pair
-12
-3
-10
Q2
-1
-2
-13
Q1
TB2
MBB
(xxxA)
-4
-21
-5
CIC card
BATTERY
CABINET
CUSTOMER
INERFACE
PANEL
UPS MODULE
10- 150KVA, 480VAC
(E6-E8, E4, E5)
2
Twisted
pair
OUTPUT TO
MBC CABINET
(3Ø,4W,G)
K1
3
MIB
(xxxA)
OUTPUT TO
CRITICAL LOAD
(3Ø,4W,G)
(E10-E12, E4, E5)
LEGEND:
MIB: UPS MODULE ISOLATION BREAKER
MBB: MAINTENANCE BYPASS BREAKER
UIB: UPS INPUT BREAKER
Maintenance Bypass Cabinet (MBC)
For SG-10 to 150kva Single UPS module
480vac, 3Ø/4W/G
Project Name:
Point of Contact:
Equipment Part Number:
STD
Issued by:
Digital Energy
Power Quality
Issued date:
PH
Revised by:
PH
04/16/12
Revised date:
05/16/12
Scale:
NONE
Rev. No.:
3.0
See table 1
Drawing Title:
System 1L for SG-10 to 150kva and 3-bkr, line up & match, MBC, w/ SKRU
Drawing No.:
Sheet No.:
1L-MBC44-30-0115K-00
1 of 2
Table 1- Maintenance Bypass Cabinet (MBC) Breaker Schedule, Lug size/quantity, and conductor size/quantity
FROM UTILITY
1
BREAKER
MBB/MIB
MODEL
(Trip)
(EATON-C)
(Trip)
MBC014-010200-K100
EHD3
15A
25A
14
MBC014-010200-K600
HFD3
15A
25A
65
MBC024-030500-K100
EHD3
30A
50A
14
MBC024-030500-K600
HFD3
30A
50A
65
MBC034-050700-K100
EHD3
50A
70A
14
MBC034-050700-K600
HFD3
50A
70A
65
MBC044-060800-K100
EHD3
60A
80A
14
MBC044-060800-K600
HFD3
60A
80A
65
MBC054-081200-K100 EHD3/FDB3 80A
125A
14
MBC054-081200-K600
HFD3
80A
125A
65
MBC084-121700-K300
FD3
125A
175A
35
MBC084-121700-K600
HFD3
125A
175A
65
MBC104-152000-K300
FD3
150A
200A
35
MBC104-152000-K600
HFD3
150A
200A
65
MBC124-202500-K300
JDB3
200A
250A
35
MBC124-202500-K600
HJDB3
200A
250A
65
MBC154-253000-K300
KDB3
250A
300A
35
MBC154-253000-K600
HKDB3
250A
300A
65
UPS
(KVA)
10
20
30
40
50
80
100
120
150
MBC
PART NUMBER
UIB
kAIC@
480Vac
(PER PHASE)
MAXIMUM
CONDUCTOR
SIZE (QTY)
LUG SIZE
(QTY)
2
FROM UPS OUTPUT
3
(PER PHASE)
MAXIMUM
CONDUCTOR
SIZE (QTY)
LUG SIZE
(QTY)
TO CRITICAL LOAD
LUG SIZE
(QTY)
4
(PER PHASE)
MAXIMUM
CONDUCTOR
SIZE (QTY)
TO UPS INPUT
NEUTRAL (TOTAL)
(PER PHASE)
LUG SIZE
(QTY)
MAXIMUM
CONDUCTOR
SIZE (QTY)
LUG SIZE
(QTY)
MAXIMUM
CONDUCTOR
SIZE (QTY)
5
GROUND (TOTAL)
(PER POLE)
DC
DISCONNECT
SIZE (A)
LUG SIZE
(QTY)
(4) 3
25A
(1) 14-1/0
(1) 3
MAXIMUM
CONDUCTOR
SIZE (QTY)
LUG SIZE
(QTY)
UPS DC INPUT
MAXIMUM
CONDUCTOR
SIZE (QTY)
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(4) #6-350
(4) 3
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 3
(4) #6-350
(4) 3
(4) #6-350
(4) 3
50A
(1) 14-1/0
(1) 3
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(4) #6-350
(4) 3
(4) #6-350
(4) 3
70A
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(1) 14-1/0
(1) 1
(4) #6-350
(4) 3
(4) #6-350
(4) 3
80A
(1) 14-1/0
(1) 1
(1) 4-4/0
(1) 4/0
(1) 14-1/0
(1) 4/0
(1) 14-1/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(4) #6-350
(4) 3
(4) #6-350
(4) 3
110A
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(4) #6-350
(4) 4/0
(4) #6-350
(4) 4/0
200A
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(1) 4-4/0
(1) 4/0
(4) #6-350
(4) 4/0
(4) 350
225A
(1) 1-500
(1) 500
(1) 4-350
(1) 350
(1) 4-350
(1) 4-350
(1) 350
(1) 4-350
(1) 350
(4) 6-500
(4) 350
(4) 6-350
(4) 350
250A
(1) 1-500
(1) 500
(1) 250-500
(1) 500
(1) 250-500
(1) 250-500
(1) 500
(1) 250-500
(1) 500
(4) 6-500
(4) 500
(4) 6-350
(4) 350
300A
(1) 1-500
(1) 500
(1) 350
(1) 500
(4) #6-350
(4) #6-350
Table 2- Control Wiring From MBC to UPS module
Terminating
point
In MBC
TB2-1
Terminating
point
In UPS
X1-12 (CIC card)
TB2-2
X1-13 (CIC card)
TB2-4
X1-10 (CIC card)
TB2-5
X1-21 (CIC card)
Wire
Size
Maximum
Voltage &
Current
18AWG
24V
1.25A
18AWG
24V
1.25A
Circuit
Function
Note
SKRU control
(Key can be removed
if UPS is on bypass)
Twisted pair
UPS control
(UPS transfer is
prohibited during testing)
Twisted pair
Project Name:
Point of Contact:
Equipment Part Number:
STD
Issued by:
Digital Energy
Power Quality
Issued date:
PH
Revised by:
PH
04/16/12
Revised date:
05/16/12
Scale:
NONE
Rev. No.:
3.0
See table 1
Drawing Title:
System 1L for SG-10 to 150kva and 3-bkr, line up & match, MBC, w/ SKRU
Drawing No.:
Sheet No.:
1L-MBC44-30-0115K-00
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