Manual Transfer Switch Specification
A Scope A.1- This specification defines the requirements for Manual Transfer Switches assembled by PSI Power & Controls. A.2- Manual Transfer Switches provided by PSI Power & Controls shall be completely assembled by a certified ISO facility. PSI Power & Controls is ISO9001:2008 certified. Number-C0098005-IS1.
B.1- The purpose of the Manual Transfer Switch is to manually transfer power to an alternate source. The most common application is transferring power from a generator to the load during utility failures. B.2- The Manual Transfer Switch can be installed indoors or outdoors with appropriate environmental rating. B.3- When installed properly, the Manual Transfer Switch provides an easy means for transferring loads to an alternate source in the event of another power source failure. B.4- The Manual Transfer Switch offerings shall include optional features such as short-circuit protection, Cam-Lok® quick-connect receptacles, service-entrance rated, and phase rotation protection.
C.1- Manual Transfer Switches shall be completely assembled and undergo a functional test procedure before shipment. This test shall be documented and included with the Manual Transfer Switch. C.2- Manual Transfer Switches shall be built in accordance with NEC requirements. C.3- Manual Transfer Switches with an ampacity range of 60-1200A are UL1008 listed and shall be built in accordance with UL508A.
D.1- PSI Power & Controls warrants the products manufactured by it and delivered hereunder will be free from defects in material and workmanship for a period of twelve (12) months after date of shipment.
II Product Requirements
A.1- All components shall be new and free of defects. A.2- All components used in UL-labeled Manual Transfer Switches shall be UL-listed or recognized.
B Electrical Ratings
B.1- Manual Transfer Switches shall be rated for single phase 100-240VAC and three phase 208-600VAC. B.2- Manual Transfer Switch shall be available with an ampacity range of 60-3000A. B.3- Manual Transfer Switch shall be available in both 3 and 4 pole configurations.
C.1- Enclosure shall be NEMA Type 1, 3R, or 4X, wall-mount or free-standing. C.2- Enclosure material shall be carbon steel with ANSI-61 gray finish or Type 316 stainless-steel. C.3- Enclosure shall have a front access door with a means for padlocking. C.4- Enclosure shall have a full gasket for protecting against foreign debris.
D Switching Device
D.1- The Manual Transfer Switch switching device shall be 3-position and rated for on-load switching. D.2- The switching device shall have a current rating greater than or equal to the overall switch rating. D.3- The switching device shall have a UL rating for 60-1200A.
E Switching Handle
E.1- Manual Transfer Switches shall have an external handle for switching. E.2- The Manual Transfer Switch handle shall have the appropriate NEMA rating to maintain the overall enclosure rating. E.3- The Manual Transfer Switch handle shall be interlocked with the enclosure door to prevent opening while in either “ON” position. E.4- The Manual Transfer Switch handle shall be padlockable in every position
F.1- When used, busbar shall be tin-plated copper. F.2- Busbar shall be sized at 1000A/sq. in.
G.1- Lugs for permanent conductors shall be aluminum, dual rated, with a mechanical screw. G.2- Lugs for field wiring shall be sized at a minimum 125% of the transfer switch’s rated ampacity.
H.1- Fuseblocks or fuseholders shall be installed in fusible switch applications. H.2- Fuseblocks shall be sized for the appropriate current and voltage rating. H.3- Stand-alone fuseblocks shall be installed in switches rated 60-600A when required. H.4- 800-3000A fuseholders shall be made as a combination of busbar, insulators, and lugs. H.5-Fuseholder busbar ampacity shall be sized for the appropriated switch rating.
I.1- Fuses shall be provided if purchased. I.2- Class RK5 fuses shall be installed in switches for 240VAC applications rated 60-600A. I.3- Class J fuses shall be installed in switches for 480VAC applications rated 60-600A. I.4- Class L fuses shall be installed for 480VAC applications rated 800-3000A.
J Cam-Lok® Receptacles
J.1- Cam-Lok® receptacles shall be insulated single pole, Cooper E1016 or Leviton 16 series, male or female with a single threaded stud connection J.2- Cam-Lok® receptacles shall be color coded for each phase depending upon system voltage
Phase Conductors 208-240VAC-Black, Red, Blue 480VAC-Brown, Orange, Yellow 575/600VAC-Black, Black, Black Neutral Conductor-White Ground Conductor-Green
J.3- Ground Cam-Lok® receptacles shall be bonded to the enclosure. J.4- Cam-Lok® receptacles shall be mounted on the enclosure wall with protective flip covers. J.5- The external arrangement for Cam-Lok® receptacles shall be phase conductors, neutral if provided, and ground. This arrangement shall be from top-bottom or left-right. J.6- The internal bussing from Cam-Lok® receptacle to Manual Transfer Switch landing tab shall be Erico Flexibar.
A.1- The Manual Transfer Switch shall be installed correctly according to the provided manual and in an appropriate location. A.2- Installation shall be in accordance with all applicable codes and standards
B.1- Enclosure penetrations for cable entry shall be used with appropriate components to maintain the specified NEMA rating
C.1-When the Manual Transfer Switch is properly installed and ready for operation, the end-user should follow all operation instructions specified in the included manual.