Technical Specifications

Masterclad 27 kV indoor switchgear is shipped on skids in protective crates or wrapping. Circuit breakers are usually shipped in their respective compartments in the closed and connected position. As an option (upon request), circuit breakers can be shipped on pallets.

Upon receipt, check the packing list against the equipment received to ensure that the order and shipment are complete. Claims for shortages or errors must be made in writing to Schneider Electric within 60 days after delivery. Failure to give such notice will constitute unqualified acceptance and a waiver of all such claims by the purchaser.

Immediately inspect the equipment for any damage that may have occurred in transit. If damage is found or suspected, file a claim with the carrier immediately and notify Schneider Electric. Delivery of equipment to a carrier at any of the Schneider Electric plants or other shipping point constitutes delivery to the purchaser regardless of freight payment and title. All risk of loss or damage passes to the purchaser at that time.

The switchgear is shipped in sections of one or two bays. Each bay has four lifting lugs bolted onto the top. If more than two bays are shipped as one section, lifting channels or frames may be bolted onto the top.

CAUTION
Improper Lifting of equipment If moving by crane, the interior angle of the lifting sling should not exceed 90°. Angles greater than 90° apply greater inward pressure of lifting lugs which can damage or dislodge lifting lugs from switchgear. Failure to follow these instructions can result in injury or equipment damage.

Put a crane hook through each of the four holes to lift and move the sections. Use load-rated cables or chains with safety hooks or shackles. A spreader bar may be necessary to maintain proper angles for lifting.

Lifting Sling

To help prevent structure damage, rig the lifting sling so that the minimum angle between lifting cables or chains and the top of the equipment is 45°, and the maximum interior angle is 90°. If a crane is not available, contact Schneider Electric before using any other lifting method. Rollers may be placed under the skids if approved moving equipment is not available or space prohibits the use of approved moving methods.

CAUTION
EQUIPMENT distortion Do not remove the skids until the shipping sections are in the final location. Do not maneuver the switchgear directly on rollers, always incorporate a pallet under the switchgear. Always use the skids to help prevent switchgear distortion or damage. Failure to follow these instructions can result in injury or equipment damage.

After the equipment has been placed in position, remove, and discard the lifting lugs. Screw the bolts back into place to cover the mounting holes.

Keep equipment in a clean, dry, well-ventilated area. Circuit breakers should be protected from dust, foreign objects, and rodents. If space heaters are furnished in the assembly, energize them from an external source. Refer to schematic and wiring diagrams for a logical connection point, and for voltage and power requirements.

If space heaters are not installed in the assembly, and the area is cold and damp, use a temporary heating source within the assembly. A minimum of 200 W of heat per circuit breaker compartment is recommended. Avoid greasy, smoky heaters that can deposit carbon on insulation, causing tracking and eventual insulation breakdowns.

If the space heaters are normally energized from a control power transformer, open the control power transformer secondary circuit breaker, remove the primary current limiting fuses, and install an out-of-service tag before energizing the space heaters. This helps prevent backfeed to the main bus through the control power transformer.

WARNING
Unintentional backfeed current to primary circuit When energizing space heaters from a remote source, remove the primary current limiting fuses of the control power transformer. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Proper site selection is essential for reliable operation of the assembly. Carefully compare the plans and specifications with the customer drawings provided. Be sure to:

• Always provide adequate ventilation so the ambient temperature around the assembly does not exceed 104°F (40°C). Clean, dry, filtered air should be supplied.

• Provide adequate lighting in both the front and back aisle spaces. Also, provide convenient outlets in both areas for electrical hand tool use.

• Provide adequate floor drainage.

• Provide adequate safeguards against water damage. Route sewer, water, and steam lines so they do not pass over or near the assembly; dripping liquids may damage the insulation.

• Make sure the site can support the weight of the complete switchgear unit. The weight of the average switchgear unit, including the circuit breaker is 3000 lb. (1360 kg). Refer to Approximate Switchgear and Component Weights to determine approximate switchgear and component weights for handling and structural considerations.

The switchgear is designed for installation on a concrete pad. Refer to the factory order drawings for any additional mounting details which may be required on specific orders. The pad must be flat and leveled to 0.06 in. (1.6 mm) per square yard to help ensure proper alignment and to help prevent distortion of the gear.

Provide a seven ft. (2.1 m) wide aisle space in front of the mounting pad, flush with and finished to the same tolerance as the mounting pad. This level surface is necessary for the circuit breaker lift truck and for inserting the circuit breakers into the bottom compartment.

Floor Plan for Switchgear Rated Up to 50 kA

Masterclad Extended Floor Plan for 63 kA-Rated Switchgear

Stub conduits a maximum of one inch. (25 mm) above floor level. To simplify moving the switchgear into place, keep the conduit flush with the surface of the floor. Position the conduit accurately so that there is no mechanical interference with the assembly frame. Eliminate continuous loops of reinforcing rod or structural steel that do not enclose all conductors of the same circuit. Floor Plan for Switchgear Rated Up to 50 kA and Masterclad Extended Floor Plan for 63 kA-Rated Switchgear illustrate typical floor plans. Refer to the customer order drawings before using the typical foundation specifications. Customer order drawings are created to comply with specific customer requirements and therefore supersede the information provided here.

Refer to the applicable drawings illustrating the typical floor plan before using the typical foundation specifications.

Conduits should be stubbed a maximum of one inch (25 mm) above floor steel. Conduit placement should be very accurate to minimize mechanical interference with the switchgear floor steel.

Avoid continuous loops of reinforcing rod or structural steel that do not enclose all conductors of the same circuit.

Typical Floor Plan (Not for Construction)