Transmittal of generator prepurchase specifications, March 1998

NYC 9/11 Public Portal Document

PPS-Generators

Provide form C (n/o-n/c) dry contacts for each of the above pre-alarms and shutdowns for interface with the BMS system. Bring wiring out to a set of terminals dedicated for this interface for the BMS contractor to extend from.

The indications shall be of the manual reset type. An alarm silencing switch and "alarm silenced" pilot light shall be included.

8. Controls shall be included in the switchgear for the tripping and lock-out of the circuit breaker for each generator set in response to reverse power, over-current or the failure to parallel.

9. Controls shall be included in the switchgear for the automatic disconnection of generators from the switchgear bus in a pre-determined field adjustable sequence as load falls, and the restoration of generators to the bus as it increases.

10. Controls shall be included in the switchgear for the simultaneous automatic disconnection of all generators from the switchgear bus in response to the activation of contacts indicating that all outlying automatic transfer switches have retransferred to the "normal position".

11. Provisions shall be included in the switchgear for the field installation and wiring of ground fault sensors, relays and monitor panels described elsewhere as part of the ground fault interrupting system.

12. Controls shall be included in the switchgear to shut down each generator set after an adjustable time delay period of five to twenty-five minutes following its discon­ nection from the switchgear bus.

13. Provisions shall be included in the switchgear for the manual starting, synchronizing and shutdown of each generator set, as well as the manual operation of each generator circuit breaker and outgoing feeder circuit breaker.

14. Provisions shall be included in the switchgear for the testing of the automatic starting and synchronizing sequence under "no load" conditions.

15. An audible signal and a visual indication shall be provided at the switchgear for the following "system pre-alarm" and "system actual alarm" conditions:-

a. Low fuel in main tank — pre-alarm.

b. Over/Under voltage — pre-alarm.

c. Over frequency — pre-alarm.

OEM PPS-27 Generators 7 WTC March 20, 1998

NYC-WTC_000166902