.
Operation
! CAUTION
Instructions for operating the Maintenance Bypass circuit breakers are on the Maintenance Bypass cabinet. Make sure you understand the proper sequence before operating any circuit breaker. Operating a Maintenance Bypass circuit breaker out of sequence could cut off power to the critical load.
Figure 62 Load on maintenance bypass, two breakers
|
|
|
| RIB |
|
|
|
| RIB |
|
|
| RIB |
|
|
|
| BIB | BFB |
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
UPS #3 | UPS #2 | UPS | #1 |
|
|
|
|
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||
CB1 |
|
| CB1 |
|
| CB1 |
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
| SBS |
|
|
|
|
|
|
|
|
|
|
|
|
| R |
|
| R |
|
| R |
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
| SBB |
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
| I |
|
| I |
|
| I |
|
|
|
|
|
|
|
|
|
|
| MBB | ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
|
|
| System |
|
|
|
|
|
|
|
|
|
| |
CB2 |
|
|
| CB2 |
|
|
| CB2 |
|
|
|
|
|
| SKRU | |||||||||
|
|
|
|
|
|
|
|
|
|
|
| |||||||||||||
|
|
|
|
| Controls |
|
|
|
|
|
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Output MIB
|
|
|
|
|
|
|
|
| SCCT | |
|
|
|
|
|
|
|
|
| To Critical Load | |
|
|
|
|
|
|
|
|
| ||
|
| MBD |
|
| MBD |
|
|
| MBD | |
|
|
|
|
|
|
|
|
| SCCT | |
Battery | Battery | Battery | ||||||||
(can accommodate up to 6 UPS modules) | ||||||||||
|
|
|
|
|
|
|
|
|
Figure 63 Load on maintenance bypass, three breakers
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STANDBY GENERATOR | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| AUTOMATIC | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| TRANSFER SWITCH | ||||
|
|
|
| RIB |
|
|
|
| RIB |
|
|
|
| RIB |
|
|
|
|
|
|
|
| BFB |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
UPS #3 | UPS #2 | UPS #1 |
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||
CB1 |
|
| CB1 |
|
| CB1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SBS |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| BIB | |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
| R |
|
| R |
|
| R |
|
| SBB |
|
|
|
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
| I |
|
| I |
|
| I |
|
|
|
|
|
|
|
|
|
|
| MBB | ||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| System |
|
|
|
| |||||||
CB2 |
|
|
| CB2 |
|
|
| CB2 |
|
|
|
| SKRU | |||||||||||||
|
|
|
|
|
|
|
|
|
| |||||||||||||||||
|
|
|
|
|
|
| Controls |
|
|
|
|
| ||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Output |
| MIB | |||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| SCCT |
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| To Critical Load |
MBD | MBD | MBD |
SCCT
Battery | Battery | Battery | (can accommodate up to 6 UPS modules) |
83