26 27 16 - Electrical Panels & Enclosures.pdf

26 27 16 – CONTROL PANELS AND ENCLOSURES

Herbert, Rowland & Grubic, Inc. 26 27 16-1 005153.0436

SECTION 26 27 16 - CONTROL PANELS AND ENCLOSURES

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Hinged cover enclosures.

B. Cabinets.

C. Terminal blocks.

D. Control stations.

E. Accessories.

1.2 RELATED SECTIONS

A. Division 26.

B. Division 46.

1.3 REFERENCES

A. NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

B. NEMA ICS 4 - Terminal Blocks for Industrial Control Equipment and Systems.

C. ANSI/NFPA 70 - National Electrical Code.

D. UL - Underwriters Laboratories, Inc.

1.4 SUBMITTALS

A. Submit in accordance with Sections 01 33 00 - Submittals and 26 05 00 – Electrical- General.

B. Submit shop drawings for all control panels. The submitted information shall be detailed specification information proving compliance to these specifications. Submittals shall include, but not be limited to, the following:

1. Enclosure information including size and NEMA classification.

2. Subpanel layout.

3. Wiring diagrams and elementaries.

4. Bill of materials.

5. Internal components (specification information, cut sheets).

6. List of nameplate titles.

7. Dimensions.

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C. Shop drawings shall be submitted for all materials used as enclosures and with the enclosures.

D. Submit equipment and material samples as requested by the Engineer. All samples will be returned.

E. Manufacturer's Instructions - Indicate application conditions and limitations of use stipulated by product testing agency specified under Article 1.6. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of product.

1.5 DEFINITIONS

A. Power Wiring - Shall mean conductors, conduit, wireway and connections, and related electrical work to supply electrical power to equipment, including electrical power to supply point for equipment control systems.

B. Control Wiring - Shall mean conductors, conduit, wireway, construction and related work to connect or interconnect relays, solenoids, contact devices, signal lights and audible signals, as well as any and all other electrical control devices indicated as related to the control functions.

C. Control Panel (CP) - Is an enclosure used to house logic or power devices such as CPT, starters, contactors, relays, timers, and may also contain pilot devices.

D. Control Station (CS) - Is an enclosure used to house pilot devices only, such as pushbuttons, indicating lights, and selector switches.

1.6 REGULATORY REQUIREMENTS

A. Conform to requirements of ANSI/NFPA 70.

B. Furnish products listed and classified by Underwriters Laboratories, Inc. or third-party testing firm acceptable to the authority having jurisdiction as suitable for purpose specified and shown.

1.7 EXTRA MATERIALS

A. Furnish in accordance with Sections 01 33 00 - Submittals and 26 05 00 – Electrical- General.

B. Provide two of each cabinet key.

C. Provide a box of each size and type of control circuit fuses.

PART 2 - PRODUCTS

2.1 MANUFACTURERS - NEMA 4X STAINLESS STEEL

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A. Hoffman - Model Series A4S wall or free standing.

B. Hammond 1418 N4 SS Series wall mounted or 1422 NA SS floor mounted.

C. McKinstry.

D. Saginaw

E. Or Equal.

2.2 MANUFACTURERS - NEMA 4X NON-METALLIC

A. Carlon - Model "Himeline" Series HL.

B. Hammond PJ Series.

C. Hoffman.

D. Or Equal.

2.3 MANUFACTURERS - NEMA 4X ALUMINUM

A. Hoffman - Model ALLP.

B. Hammond.

C. Or Equal.

2.4 MANUFACTURERS - NEMA 7

A. Appleton - Model EXB.

B. Crouse-Hinds.

C. Or Equal.

2.5 MANUFACTURERS - NEMA 12 SINGLE DOOR

A. Hoffman - Model Series A12.

B. Hammond - Series 1418.

C. McKinstry.

D. Or Equal.

2.6 MANUFACTURERS - NEMA 12, TWO-DOOR AND FREE STANDING

A. Hoffman - Model Series AR and A4L.

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B. Hammond - Series 1422.

C. McKinstry.

D. Or Equal.

2.7 MANUFACTURERS – NEMA 7/4X (4X/7) ENCLOSURES

A. Akron Electric.

B. Crouse-Hinds.

C. Or Equal.

2.8 SHEET METAL ENCLOSURE FABRICATION

A. After fabrication and assembly of all sheet metal enclosures, grind all welds smooth, and then thoroughly degrease and clean.

Apply at least two coats of rust inhibiting primer or undercoat of the manufacturer's standard quality followed by at least two coats of baked enamel or epoxy finish. For exterior enclosures utilizing an epoxy finish, the enclosure shall have a final overcoat of clear acrylic polyurethane.

B. Finish Color of All Enclosures - ANSI 61 Light Gray.

C. Turn back edges and file all sharp corners smooth.

D. Enclosure Opening:

1. Roll lips on all sides.

2. Provide neoprene gasket.

3. Provide drip shield kits for exterior enclosures.

E. Doors:

1. Rolled lips on unhinged sides (three sides).

2. Full length piano-type hinges.

3. Provide all front or rear panel doors with door holders sized appropriately for the weight of the equipment on the door.

4. NEMA 4, 4X, and 12 Door Latches - Quick release, 1/4 turn operation.

5. Hinged doors over 24 inches high shall have latching device at three points.

6. Provide mechanical interlock between door and panel power disconnect mechanism. The interlock is to prevent the door from opening while the disconnect switch is closed. Provide an unlabeled defeater mechanism to permit qualified personnel access to panel while it is powered. Panel disconnecting means operator shall be flange mounted for three phase panels, internal for single phase. Do not use through-the-door operators.

2.9 ACCESSORIES

A. Manufacturer - Cable Ties:

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1. Thomas & Betts - Model Nylon TY-WRAPS.

2. Burndy Products.

3. Or Equal.

B. Manufacturer - Terminal Blocks:

1. Buchanan - Model 0241.

2. Connectron - Model N553.

3. Or Equal.

C. Manufacturer - Wire Duct:

1. Stahlin Brothers - Model XT-Panel Channel.

2. Panduit Corporation - Model Type E-Dark Grey.

3. Carlon.

4. Or Equal.

D. Manufacturer - Grounding Terminals:

1. Burndy - Model OA4C-AB.

2. ILSCO Corporation.

3. Thomas & Betts.

4. Or Equal.

E. Provide one drawing pocket in the panel, minimum size 10 inches wide by 10 inches high by 1/2 inch deep, panel manufacturer's standard material and finish.

F. Stainless steel sunshields, either provided by the enclosure manufacturer or shop fabricated, shall be provided for all exterior-mounted control panels and enclosures.

PART 3 - EXECUTION

3.1 ELECTRICAL CONTROL

A. Shall be in accordance with Section 26 09 16 - Auxiliary Controls and Relays.

3.2 POWER CIRCUIT PROTECTIVE DEVICES

A. Shall be in accordance with Section 26 28 16.13 - Overcurrent Protective Devices.

3.3 NAMEPLATES

A. Provide nameplates on the exterior of each enclosure identifying the application or function of the enclosed equipment.

B. Nameplates and labels per Section 26 05 53 - Electrical System Identification.

3.4 EQUIPMENT HOUSING TYPES

A. Enclosure, Control Panel or Device Applications

1. Exterior Locations - NEMA 4X stainless steel.

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2. Interior Wet Locations - NEMA 4X stainless steel.

3. Corrosive Areas - NEMA 4X non-metallic (fiberglass).

4. Hazardous Locations – NEMA 7/4X

5. All Other Areas - NEMA 12 painted.

B. All door-mounted devices shall be equal to the NEMA rating of the enclosure.

3.5 CONTROL PANEL CONNECTIONS

A. Regardless of who furnishes or installs the various panels, all are connected electrically under this section unless specifically shown or specified otherwise.

3.6 FINISH REPAIR

A. Repair damage to the factory finish per manufacturer specifications. Depending on the extent of damage to the factory-finish and/or the closeness of the color match of any field-applied paint, a complete repainting may be ordered by the Owner at his discretion.

3.7 DOOR QUANTITY

A. Provide two doors if panel is larger than 36 inches wide.

3.8 CONTROLS AND ASSOCIATED CIRCUITRY

A. Each control panel shall contain all applicable disconnects, including a single main power disconnect (unless specifically shown otherwise on the drawings); motor circuit disconnect - one for each motor; necessary control pushbuttons; timers; relays; door interlock switches; indicator lights; selector switches; alarms; instruments and associated circuitry to monitor and control the associated equipment. Main power disconnect operating mechanisms shall be flange mounted not through the door.

3.9 CONTROL PANEL WIRING

A. Wire Type - See Section 26 05 19 - Conductors.

B. Wire Duct - Used for wiring between devices that are mounted on the back panel of control panels.

C. Wire Bundling - Where it is not possible to run wire in wire duct, such as wire run from devices located in the back of a panel to devices mounted on the door of a panel, the wire is to be bundled. Wire lacing or twine is not acceptable:

1. Bundles are to be wrapped by a spiral plastic protective sheath. Secure bundles to the panel structure for a stable support with a spacing of no less than every 8 inches.

2. A wire bundle which must cross a hinge shall run along the hinge as far as possible or have a large loop in bundle and be secured at both ends so that the twisting is taken over the longest length of hinge possible. Wire shall not be split off from the bundle along this length.

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D. Wiring and Termination Methods - Interior wiring to be point-to-point with no splices. All wiring from and to the control panel to be through terminals located in the panel.

Solderless insulated crimp-type locking fork lugs shall be used for terminations to screw-type terminals. Where screw-type terminals are not used, terminals shall be of the tubular clamp type. Install lugs such that no uninsulated wire is visible at the wire entry point, and wire strands are not protruding from the screw connections end. Use solderless connectors or tubular clamp connectors for all connections to terminals and equipment.

E. Shielded Wire - Separate from other wires and equipment with suitable barriers and with terminal blocks for continuous shield grounding to the connecting cables.

F. Separate intrinsically safe wiring from all other wiring with barriers.

G. Furnish panels factory-wired and tested with all equipment and appurtenances mounted thereon.

H. Wire Labeling - Mark wires at both ends with numbers from Engineer-approved elementaries per Section 26 05 53 - Electrical System Identification. Color coding per Section 26 05 00 - Electrical-General.

I. Panel Wiring - All panel wiring shall be installed by the panel manufacturer.

J. Lamp Test Switch - For panels with more than five indicating lights, provide a single lamp test switch in lieu of push-to-test type indicating light.

3.10 TERMINAL BLOCKS

A. Arrange terminals in alphabetic and numeric order in columns on removable subplates.

Locate columns at least 4 inches from any edge of the subplate and space 6 inch on centers and at least 2 inches from a wiring duct.

B. Provide marked terminals with wire number from Engineer-approved elementaries.

Locate terminals with the same wire number adjacent to each other and jumpered.

C. Make a maximum of two connections to each side of a terminal, including jumpers.

D. Provide an additional 20 percent spare terminals with the following as minimum requirements:

1. Power Terminals - Three spares.

2. Control Terminals - Ten spares.

E. At least one position on a terminal block must be reserved for termination of each incoming wire. Locate all such positions on the same side of the column of terminals. A wiring duct to feed the terminals must be sized to include wires for these positions.

F. Connect all ground terminals of power receptacles solidly to the frame of the panel.

Provide the control panel with one grounding terminal. Mount grounding terminals to the frame of the panel or rack.

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3.11 WIRING DUCT

A. Size wiring duct at 60 percent fill according to the maximum number of wires at any cross section, including field wiring terminations and spares. Wiring duct must be plastic.

3.12 CONTROL PANEL INSTALLATION

A. Wall mount panel enclosures that are up to 48 inches in height; floor mount larger panel enclosures.

B. Furnish control panels, where shown, with power disconnect switches which will de energize the power supply to the panel.

C. Ground Panels - Connect all equipment and circuits in the panels shown or required to be grounded to the grounding conductors.

D. Install panels where shown. Provide conduit entry as shown or specified or as required for the installation.

E. Upon completion of installation, the equipment manufacturer's representative shall check panels and make necessary adjustments.

F. Panel manufacturer to mount all equipment shown or specified to be furnished with a panel. Furnish panels as completely assembled units.

G. For all wall mounted panels, provide a minimum of four brackets designed for wall mounting.

3.13 MOUNTING HEIGHT

Mount control panels such that:

A. No disconnect handle is higher than 5 feet 6 inches to the highest part of handle. Mount all separately enclosed disconnect switch handles 4 feet 6 inches from floor or other working surface unless otherwise indicated (5 feet to the top of enclosure).

B. Top of wall-mounted enclosures shall not be higher than 6 feet.

C. No pilot device shall be higher than 5 feet 6 inches.

D. No operator interface device (i.e., graphic display screen, etc.) is higher than 5 feet 0 inches to the centerline of the device, measured from the floor or walking surface in front of the panel.

3.14 ENCLOSURE INSTALLATION METHODS

A. Support - Adequately support all enclosures from walls, structure, or on support panels or plates independently of the conduit system. Provide additional supports for seismic restraint.

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B. Support Material - Size fasteners utilizing a safety factor of 5.

C. Mounting Accessories - Section 26 05 29 - Electrical Supports, Anchors and Fasteners.

D. All panels and enclosures shall be installed level and plumb.

END OF SECTION