elssg12

January 2000

Process Industry PracticesElectrical

PIP ELSSG12Design and Fabrication of Outdoor Enclosures for

Motor Controllers and Switchgear

PURPOSE AND USE OF PROCESS INDUSTRY PRACTICES

In an effort to minimize the cost of process industry facilities, this Practice hasbeen prepared from the technical requirements in the existing standards of majorindustrial users, contractors, or standards organizations. By harmonizing these technicalrequirements into a single set of Practices, administrative, application, and engineeringcosts to both the purchaser and the manufacturer should be reduced. While this Practiceis expected to incorporate the majority of requirements of most users, individualapplications may involve requirements that will be appended to and take precedence overthis Practice. Determinations concerning fitness for purpose and particular matters orapplication of the Practice to particular project or engineering situations should not bemade solely on information contained in these materials. The use of trade names fromtime to time should not be viewed as an expression of preference but rather recognized asnormal usage in the trade. Other brands having the same specifications are equallycorrect and may be substituted for those named. All Practices or guidelines are intendedto be consistent with applicable laws and regulations including OSHA requirements. Tothe extent these Practices or guidelines should conflict with OSHA or other applicablelaws or regulations, such laws or regulations must be followed. Consult an appropriateprofessional before applying or acting on any material contained in or suggested by thePractice.

Process Industry Practices (PIP), Construction Industry Institute, TheUniversity of Texas at Austin, 3208 Red River Street, Suite 300, Austin,Texas 78705. PIP member companies and subscribers may copy this practicefor their internal use.

Not printed with State funds

January 2000

Process Industry Practices Page 1 of 8

Process Industry PracticesElectrical

PIP ELSSG12Design and Fabrication of Outdoor Enclosures for


Table of Contents

1. Introduction.................................21.1 Purpose............................................21.2 Scope...............................................2

2. References ..................................22.1 Process Industry Practices................22.2 Industry Codes and Standards..........22.3 Conflict Resolution............................3

3. Design and Fabrication ..............33.1 Base.................................................33.2 Walls and Roof.................................33.3 Doors................................................43.4 Screens and Filters...........................43.5 Electrical Accessories.......................53.6 Grounding.........................................53.7 Nameplates......................................53.8 Coatings...........................................6

4. Inspection and Testing ..............6

5. Documentation ...........................75.1 Documentation Content....................75.2 Drawing and Data Requirements......7

PIP ELSSG12Design and Fabrication of Outdoor Enclosures for January 2000Motor Controllers and Switchgear

Page 2 of 8 Process Industry Practices

1. Introduction

1.1 Purpose

The purpose of this Practice is to provide a specification for the design and fabricationof outdoor enclosures that are provided as an integral part of enclosed equipment.

1.2 Scope

1.2.1 This Practice covers requirements for design, fabrication, testing and handlingof free-standing outdoor enclosures housing low and medium voltage motorcontrollers and switchgear.

1.2.2 The requirements of this Practice shall apply to walk-in and non-walk-inenclosures located in a non-classified area. This Practice is not intended forenclosures that will be located in classified areas.

1.2.3 These enclosures are not recommended for use in corrosive, dirty, or dustyenvironments.

1.2.4 These enclosures are not intended for climate-controlled or pressurizedapplications. When pressurized or insulated climate-controlled enclosures arerequired, see PIP ELSSG11.

2. References

Applicable requirements in the latest edition (or the edition indicated) of the following industrystandards and Process Industry Practices shall be considered an integral part of this Practice.Short titles will be used herein when appropriate.

2.1 Process Industry Practices (PIP)

PIP ELSSG12D - Data Sheet for PIP ELSSG12 - Design and Fabrication ofOutdoor Enclosures for Motor Controllers and Switchgear

2.2 Industry Codes and Standards

All enclosures shall be designed, fabricated and tested in accordance with theapplicable sections of the following standards:

American National Standards Institute Inc. (ANSI/IEEE)

ANSI/IEEE C37.20.1 - IEEE Standard for Metal-Enclosed Low-VoltagePower Circuit Breaker Switchgear

ANSI/IEEE C37.20.2 - IEEE Standard for Metal-Clad and Station-TypeCubicle Switchgear

ANSI C37.100 - American National Standards Definitions

American Society for Testing Materials (ASTM)

ASTM B117-94 - Operating Salt Spray (Fog) - Testing Apparatus

PIP ELSSG12January 2000 Design and Fabrication of Outdoor Enclosures for



ASTM D659-86 - Method of Evaluating Degree of Caulking of Exterior Paints

ASTM D714-94 - Standard Test Method for Evaluating Degree of Blisteringof Paints

ASTM D1654-92 - Method for Evaluation of Painted or Coated SpecimensSubjected to Corrosive Environments

ASTM D2244-89 - Test Method for Calculation of Color Differences FromInstrumentally Measured Color Coordinates

National Electrical Manufacturers Association (NEMA)

NEMA ICS-6 - Industrial Control and Systems Enclosures

National Fire Protection Association (NFPA)

NFPA 70 - National Electrical Code

Underwriters Laboratory (UL)

UL-508 - Industrial Control Equipment

2.3 Conflict Resolution

Any conflicts between the referenced documents shall be referred to the Buyer inwriting for resolution. When resolving conflicts, the following order of precedenceshall apply:

Purchase Order

Plan View and Associated Drawings

Data Sheet, PIP ELSSG12D

This Practice, PIP ELSSG12

Referenced Standards

3. Design and Fabrication

3.1 Base

3.1.1 Enclosure shall be provided with a totally enclosed base constructed of4-inch (102-mm) minimum channel or I-beam.

3.1.2 Where bottom entry is used, removable floor plates shall be provided in rearcable compartment.

3.2 Walls and Roof

3.2.1 Enclosures shall be Category B as described in Table A.1 of ANSI/IEEEC37.20.2-1993. Enclosures shall also comply with requirements listed inSection A.3.8 of ANSI/IEEE C37.20.2-1993.

3.2.2 Enclosures shall be constructed of steel with a minimum thickness of #11Manufacturers Sheet Gauge.



3.2.3 Joints in the outer steel housing shall be designed and fabricated to prevent theentry of dust and moisture. All gaskets shall be continuous and held in metalretainers (channel, etc.).

3.2.4 Locations of incoming and outgoing bus duct and cable shall be coordinatedwith equipment to be enclosed.

3.2.5 All outdoor handles and hardware shall be Series 300 stainless steel.

3.2.6 The roof shall be sealed and sloped to provide drainage in a direction awayfrom personnel doors and any front access doors.

3.2.7 Side paneling shall stop a minimum of 3 inches (76 mm) above bottom ofbase.

3.3 Doors

3.3.1 Walk-in enclosures with protected aisles shall be provided with an outerpersonnel door, the width of which shall be 36 inches (914 mm) minimum.

3.3.2 Enclosures more than 72 inches (1.8 m) wide shall have a door at each end.The door width shall be large enough to remove the largest controller orbreaker element. The doors shall swing outward and be equipped with panicbars or other devices that are normally latched and designed to open undersimple pressure. When indicated on the Data Sheet, the door shall haveprovisions for padlocking or for the Buyers lockset.

3.3.3 Door stops on personnel doors and equipment access doors shall be providedto maintain doors in the open position.

3.3.4 Equipment access doors on the front of the enclosure shall be equipped withgasketed, hinged doors with a 3-point latching mechanism.

3.3.5 Equipment access doors on the rear of the enclosure shall be equipped withgasketed, hinged doors. Latching mechanisms shall be as specified on theData Sheet and may be 3-point latch, three sides bolted, or both.

3.3.6 Latches on equipment access doors shall engage the steel frame at three points(top, bottom, and side) to latch the door closed and shall have a rolling orsmooth sliding action when engaging the frame to aid in operating the latches.

3.3.7 All doors shall be suitable for pad locking.

3.3.8 Where bolts are used to secure equipment access doors, removal of bolts shallbe by tool only.

3.4 Screens and Filters

Enclosures shall have louvered ventilation openings at the top and bottom. Ventilationopenings shall not be provided in personnel doors. Such openings shall be equippedwith screens and reusable, washable filter elements. The filter element shall be safelyaccessible for replacement while the equipment is in normal service.




3.5 Electrical Accessories

3.5.1 Panelboards

Seller shall provide a circuit breaker panel with main circuit breaker andminimum of six branch circuit breakers. These branch circuits will servelighting, receptacles, fans, personnel space heaters, etc. Power supply voltageshall be as specified on the Data Sheet.

3.5.2 Heaters

When indicated on the Data Sheet, walk-in enclosure shall include personnelspace heaters with hand-off-auto switches and thermostats to activate at presettemperatures. A form C contact shall be provided for use as a remote alarm toindicate over- or under-temperature conditions inside the enclosure.

3.5.3 Fans

When indicated on the Data Sheet, walk-in enclosure shall include ventilationfans with hand-off-auto switches and thermostats to activate at a presettemperature. A form C contact shall be provided for use as a remote alarm toindicate over-temperature.

3.5.4 Lighting

Illumination controlled by toggle or door switches shall be provided in alloutdoor equipment. Minimum illumination shall be 30 foot candles on thevertical panels, 42 inches (1.1 m) above the floor. Light switches shall beidentified with engraved nameplates indicating the power source and shall belocated beside the door(s). In walk-in enclosures, three-way switches forlighting shall be installed and located beside each door. Lighting fixtures shallhave guards and lights shall be suitable for service conditions listed on theData Sheet.

3.5.5 Receptacles

When indicated on the Data Sheet, walk-in enclosure shall include one indoor,120 volt GFCI-type receptacle outlet located near each personnel door.

3.6 Grounding

One NEMA standard 4-hole stainless steel ground pad shall be located on diagonallyopposite corners of the enclosure skid (total of 2 ground pads). Seller shall connectequipment ground bus to the ground pads.

3.7 Nameplates

Permanent nameplates shall be provided to identify each circuit breaker, transitioncompartment or auxiliary compartment. Nameplates shall be provided on the front andrear doors of non-walk-in enclosures. Nameplates shall be provided on rear doors ofwalk-in enclosures. All nameplates shall be made of laminated, beveled plastic that is aminimum of 3/32 inch (2.38 mm) thick and shall be affixed with stainless steelhardware.



3.8 Coatings

3.8.1 All structural framing members shall be cleaned to near white metal. The useof chemical or solvent cleaning of structural steel shall not be permitted.Following cleaning, one shop coat of zinc-chromate primer (1.5 mils minimumdry thickness) shall be applied.

3.8.2 Floor surface shall be finished with a durable, scuff-resistant, non-skid epoxyor enamel coating.

3.8.3 All seams outside the enclosure shall be sealed with 25-year marine sealant topreclude crevice corrosion and assure the environmental integrity of theenclosure against blowing rain, dust, dirt, or sand.

3.8.4 All interior and exterior exposed metal surfaces shall receive factory paint thatmeets or exceeds the requirements of a 2000-hour salt spray test as defined byASTM B117-94 and evaluated per ASTM D1654-92 andASTM D714-94.

3.8.5 Interior and exterior color coating design shall meet the following performancestandards after 10 years continuous exposure in normal atmosphericconditions:

a. Panels shall show no evidence of blistering, peeling, or chipping.

b. Panels shall show no surface chalking in excess of the ASTM D659-86No. 8 rating.

c. Panels, after cleaning, shall show no color change in excess of seven (7)units when measured in accordance with the ASTM D2244-89 standard.

3.8.6 Exterior and interior of enclosure shall be painted white, unless specifiedotherwise on the Data Sheet.

3.8.7 All structural members under the flooring shall be coated with an additional20-25 mils of bitumastic or equal undercoating to eliminate base rusting andsubsequent corrosion.

3.8.8 Two (2) 1-quart cans of touch-up paint shall be supplied per equipmentassembly for each color used.

4. Inspection and Testing

4.1 The Seller shall conduct all tests and inspections necessary to determine that allequipment and wiring is installed in accordance with this Practice and is in satisfactorycondition to be energized. All test results shall be documented and submitted to theBuyer for record.

4.2 All equipment shall be inspected for compliance with all parts of this Practice. Inaddition to testing required by individual equipment specifications, a functional testshall be performed to ensure proper operation of all devices and components.




4.3 Unless specified otherwise on the Data Sheet, Buyer shall witness all production andfunctional tests. Two-weeks notice shall be given to Buyer for required inspection andtesting date to meet shipment deadlines.

5. Documentation

5.1 Documentation Content

5.1.1 All engineering data provided for this equipment shall represent the actualequipment specified and ordered.

5.1.2 Typical drawings are acceptable only if they are revised to identifyspecifically the equipment, dimensions, wiring, and accessories beingfurnished.

5.1.3 All drawings and data supplied by the Seller shall be identified with Buyersname, project number, purchase order number, and item number along withthe Sellers shop order number.

5.1.4 Drawings shall have a space on the right-hand bottom corner for Buyers titleblock.

5.2 Drawing and Data Requirements

Seller to provide one (1) reproducible set of drawings plus the specified number ofcopies of all documentation and operating manuals as indicated on the Data Sheet.Unless otherwise specified on the Data Sheet, the format for the reproducibledrawings shall be CAD convertible .dxf electronic format.



A

WithBid

B

ForReview

C

FinalCertified

D

AsBuilt

DESCRIPTION

X X X X General layout of equipment showing alldimensions, weights, and location; outline drawingsshowing the final assembled configuration

X X X Detailed plans and elevation drawing showinglocation of all components

X X Foundation loading diagram and soleplate details

G D D Detailed (D) or General (G) bill of materialsincluding name of the manufacturer and catalognumber of all components

X(1) Installation, Operation, and Maintenance Manual

X X Recommended priced spare parts list

A. Buyer shall furnish these documents with proposal.B. Seller shall furnish these documents for Buyer's review and authorization to proceed

before fabrication.C. Seller shall furnish these documents as part of the final certified document submittal.

(1) Seller to include one set of installation, operation, and maintenance manuals with theequipment when shipped.

D. Seller shall furnish final as-built drawings within 2 weeks following shipment.

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