NEX Series Single Phase Duplex Control Panel

1.01 GENERAL

A.	Contractor shall furnish all labor, materials, equipment and incidentals required to provide a duplex motor control panel as specified herein.

B.	The motor control panel shall be assembled and tested by a controls system manufacturer (SJE Rhombus or pre-approved equal) meeting the Standards of UL 508A for industrial controls and be UL labeled and serialized accordingly.  The motor control panel shall be assembled and tested by the manufacturer so as to ensure suitability in matching controls to motors and to insure single source responsibility for the equipment.

C.	The panel shall contain all components required by the pump manufacturer for starting and protecting the motor as well as features required by the pump manufacturer for warranty of the pumps. 

D.	Incoming pump power shall be single-phase, 60 Hz, 120/208/240 volts AC.

E.	Incoming control/alarm power shall be single-phase, 60 Hz, 120/208/240 volts AC.  

F.	The control panel shall incorporate three (3), or four (4), normally open, mercury or mechanically activated control switches with pipe clamps. Floats shall be labeled in the panel as stop, start, and alarm. Floats shall be SJE Rhombus control switches or approved equal.

2.01 CONSTRUCTION

A.	The controls for the pump shall be housed in an engineered ultraviolet stabilized thermoplastic enclosure meeting NEMA 4X requirements with a hinged door and neoprene gasket. The enclosure shall have provisions for a padlock along with integral mounting feet.
 
B.	A nameplate shall be permanently affixed to the panel. A ratings label shall include the model number, voltage, phase, frequency, ampere rating and horsepower rating and shall be affixed to the inside of the enclosure. A warning label against electric shock shall be permanently affixed to the outer door. 

C.	A removable plastic bracket shall be provided for mounting all circuit breakers, power relays, etc. Rivets shall not be acceptable for securing any component to the backplate.
 
D.	A duplex pump controller shall be provided for control logic. The controller shall utilize a printed circuit board to avoid conventional wiring. The printed circuit board of the pump controller shall be manufactured using UL listed materials. There shall be separately fused control and alarm circuit protection. Run lights and hand-off-auto switches shall be provided for each pump circuit. The run lights and hand-off-auto switches shall be mounted on the printed circuit board. The run lights shall be green. 

E.	Circuit breakers shall be used as branch circuit protection for each pump. The circuit breakers shall be thermal magnetic and sized to meet NEC requirements for interrupt capacity and amp rating.  

F.	The power relays shall be rated for the pump horsepower and have a minimum mechanical life of 5,000,000 cycles and a minimum electrical life of 100,000 cycles resistive.

G.	A high-level alarm condition shall activate the main alarm light and alarm horn. Alarm light shall be LED light stick connected to main circuit board. The alarm horn shall be rated 85-90 dB minimum.  A Test-Silence push button switch labeled and placed adjacent to the horn, shall be included. The alarm shall automatically reset once the alarm condition has been cleared. 

H.	The alternator shall consist of an alternating circuit which alternately switches pumps upon the next pumping cycle. The alternation circuitry shall be integrated into the pump controller.

I.	The control panel shall include auxiliary alarm contacts (form C) for signaling an external device.

J.	The control panel shall be a NEX series single phase duplex panel as manufactured by SJE Rhombus or approved equal.