TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
6. Located on the face of the circuit breaker shall be indicators to show the position of the circuit breaker
contacts, status of the closing springs, and circuit breaker position in the cell. An indicator shall show
“charged – not OK to close” if closing springs are charged but circuit breaker is not ready to close.
Circuit breaker racking system must have positive stops at the connected, test, disconnected and
withdrawn positions.
7. Secondary wiring shall be front accessible.
8. Circuit breakers shall provide long service life. The 4000 A frames must be certified to 5000 operations
without maintenance.
9. Circuit breaker trip system shall be an electronic trip unit with functions of adjustable long-time pickup
and delay, short-time pickup and delay, instantaneous, and ground-fault pickup and delay. Trip unit
shall be true RMS current sensing.
10. Electronic trip unit shall be UL Listed and field replaceable.
11. Electronic trip units shall have internal metering capability.
12. Electronic trip units shall have network communications ability for remote monitoring and configuration
13. The main and tie breakers shall be of the same type and rating and shall be interchangeable
D. Secondary Feeder Circuit Breakers
1. All protective secondary devices shall be molded case circuit breakers.
2. All breakers shall be UL listed for application in their intended enclosures.
3. Where indicated on the drawings, circuit breaker trip system shall be an electronic trip unit with
functions of adjustable long-time pickup and delay, short-time pickup and delay, instantaneous, and
ground-fault pickup and delay. Trip unit shall be true RMS current sensing.
2.6 METERING
A. Multifunction Digital Metering Monitor: Eaton Xpert 2270 series meter, or Square D Powerlogic PM820 series
meter, or equivalent by General Electric. Supply with all accessories needed for a fully functional networkconnected
installation.
2.7 INSTRUMENT TRANSFORMERS
A. Provide all potential (voltage) transformers and current transformers as needed for metering as indicated in
the contract documents.
1. All current transformers shall be wired through shorting-type terminal blocks. All current transformer
current loop terminations shall be made with ring-type terminations.
2. Burden and accuracy of all instrument transformers shall be consistent will all connected devices.
12 KV – 480/277V SECONDARY DOUBLE-ENDED UNIT SUBSTATIONS 16371-7