16-SAMSS-518_24 Aug 2016

Materials Sys ystem tem Speci Specifi fication cation 16-SAMSS-518 16-SAMSS- 518

24 August 2016

Low Voltage Panelboards Document Responsibility: Responsibility: Electrical Substations Substations Equipment Equipment Stds. Committee

Contents

1

Scope ................................................... .......................................................... ....... 2

2

Conflicts and Deviations Deviations .............................. .............................. 2

3

References References ............................................... .................................................. ... 2

4

Definitions................................................. .................................................... ... 3

5

General................................................. ........................................................ ....... 4

6

Classified Area Panelboard ......................... ......................... 4

7

Service Conditions....................................... ....................................... 5

8

Rating ................................................... .......................................................... ....... 6

9

Enclosures................................................ ................................................... ... 6

10

Conductors Conductors ............................................... .................................................. ... 7

11

Grounding (Earthing) ................................... ................................... 8

12

Switching Devices ....................................... ....................................... 8

13

Nameplates ................................................. ................................................. 9

Revision Summary .............................................. .............................................. 9 Data Schedule 1 ........................................... ................................................ ..... 10

Previous Issue: 16 June 2013

Next Planned Update: 24 August 2019 Page 1 of 10

Contact: Al-Suwaidan, Hussain Musleh (suwaidhm suwaidhm)) on +966-13-8809562 ©Saudi Aramco 2016. All rights reserved.

Document Responsibility: Electrical Substations Equipment Standards Committee Issue Date: 24 August 2016 Next Planned Update: 24 August 2019

1

16-SAMSS-518 Low Voltage Panelboards

Scope This specification is based on NEMA PB 1, and UL 67. It defines the mandatory requirements for low voltage panelboards installed indoors or outdoors. This specification covers completely enclosed panelboards and also p anelboards which are integrated into switchboards. Commentary Note: This specification covers all low voltage panelboards voltage panelboards including panelboards for Uninterruptible Power Supply (UPS) and Direct Current (DC) service.

2

3

Conflicts and Deviations Deviations 2.1

If there are any conflicts between this Specification and associated purchasing, project or engineering documents, this specification shall take precedence.

2.2

Direct all requests to deviate from this Specification in writing to the Company or Buyer Representative, who shall follow internal company waiver procedure.

2.3

The designation Commentary is used to label a sub-paragraph that contains comments that are are explanatory or advisory. advisory. These comments are not mandatory, except to the extent that they explain mandatory requirements contained in this SAMSS. “

”

References The following is a summary of all the documents which have been mentioned within this Specification. The specific part(s) of these documents which are applicable have been identified throughout this Specification. 3.1

Saudi Aramco References Saudi Aramco Engineering Standard SAES-P-100

Basic Power Power System Design Criteria Criteria

Saudi Aramco Materials System Specification 17-SAMSS-516

3.2

Uninterruptible Power Supply System

Industry Codes and Standards International Electrotechnical Commission IEC 60529

Degrees Degrees of Protection Protection Provided Provided by Enclosures Enclosures Saudi Aramco: Company General Use Page 2 of 10


IEC 60947-1 60947-1

Part 1: General General Rules Rules

IEC 60947-2 60947-2

Part 2: Circuit Circuit Breakers Breakers


National Electrical Manufacturers Association NEMA 250

Enclosures Enclosures for Electrical Electrical Equipment Equipment (1000 Volts Maximum)

NEMA PB 1

Panelboards Panelboards

Underwriters Laboratories, Inc. UL 67

4

Panelboards

Definitions Conductor: All material, devices and parts, which are expected to carry current as part of their normal function. Copper Free: 0.4 of 1% maximum copper content. Explosionproof Panelboard: multiple breakers housed in an explosionproof overall enclosure designed to control the explosion inside the enclosure. Flameproof Panelboard: Multiple breakers housed in a non-explosionproof overall enclosure breakers. Breakers are either in individual exp losionproof enclosures or are of flameproof design. Low Voltage: Means a voltage level of less than 1000 volts. Main Circuit: All the conductive parts of an assembly included in a circuit, which is intended to transmit electrical energy to the connected loads. Commentary Note: “

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Note that, main circuit includes the panelboard neutral conductor system.

Main Circuit Disconnector: Device to isolate the panelboard from the main incoming circuit. Commentary Note: Frame size and trip rating is selected by the panelboard manufacturer to meet the requirement in this specification that the disconnector allow the full capacity of the bus to be utilized.

Manufacturer. The manufacturer who designed the PEM: Parent Equipment Manufacturer. equipment and who confirmed the design performance through certified design/type tests. This manufacturer (1) has the legal authority to license the assembly of this Saudi Aramco: Company General Use Page 3 of 10



equipment to others (2) is responsible for the technical performance of the equipment and (3) will be able to provide after-sales support and parts for the equipment. Plastic: General term, which includes all non-metallic material, including fiberglass. Switching Device: A device designed to make or break current.

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General 5.1

Terms in bold font are defined within Section 4.

5.2

Panelboards shall fully comply with NEMA PB 1 and UL 67. Exception to 5.2: Flameproof panelboards shall comply with the relevant IEC standards.

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5.3

All requirements of this specification must be implemented using standard designs which have been approved, have been fully tested, and are fully supported by the PEM.

5.4

Whenever this specification requires compliance to a third party document (e.g., ANSI, UL,IEC, etc.), this document shall be the edition which was in effect on the date of the Quotation Request.

5.5

This specification shall take precedence over any referenced third party document.

5.6

For panelboards which provide branch circuits operating at phase-to-neutral voltage levels, a neutral bus shall be provided within the panelboard.

5.7

All temperatures expressed within this specification are in Celsius units.

5.8

(Modification) to NEMA PB 1, Section 2.1 and UL 67, Section 6.2.1: No equipment other than circuit breakers shall be allowed in panelboards.

Classified Area Panelboard Panelboard 6.1

If specified in Data in Data Schedule 1 as being installed in an electrically classified area, panelboards shall comply with the following requirements: 6.1.1

(Addition) to NEMA PB and UL 67: Panelboards shall be of either the the following designs: a)

Explosionproof panelboard, design with the branch circuit connections and the breaker in separate compartments is required. The panel shall be completely filled with breakers. Saudi Aramco: Company General Use Page 4 of 10


b) 6.1.2

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Flameproof panelboard, the internal line, and load connectors to the breakers shall be factory wired.

(Addition) to NEMA PB 1 and UL 67: The branch circuit connection, inclusive of spares, shall be terminated on terminal blocks within the termination compartment. The neutral and ground ground buses shall be within this compartment.

Service Service Conditions 7.1

Panelboards installed indoors shall be suitable for continuous operation under the following service conditions: 7.1.1

7.1.2

7.2

Ambient air temperature: a)

A maximum of 40°C

b)

(Modificati (Modification) on) to NEMA NEMA PB 1, Section 2.6 2.6 and UL 67, 67, Section Section 19.1: A minimum of 0°C.

c)

Average temperature, measured over a period of 1 month, month, is a maximum of 35°C.

Relative humidity (average value). a)

For a period of 24 hours, does not exceed 95%.

b)

For a period of 1 month, does not exceed 90%.

Panelboards installed outdoors shall be suitable for continuous operation under the following service conditions: 7.2.1

Ambient air temperature: a)

(Addition) to NEMA PB 1 and UL 67: A maximum of 50°C.

b)

(Addition) to NEMA PB 1 and UL 67: A minimum of 0°C, unless a lower temperature is specified within Data within Data Schedule 1.

c)

(Addition) to NEMA PB 1 and UL 67: Average temperature, measured over a period of 1 month, is a maximum of 45°C.

7.2.2

(Modification) to NEMA PB 1, Section 2.6: (Addition) to UL 67: Altitude is less than 1000 meters, unless a higher altitude is specified within Data within Data Schedule 1.

7.2.3

Average value of the relative humidity: a)

(Addition) to NEMA PB 1 and UL 67: For a period of 24 hours, Saudi Aramco: Company General Use Page 5 of 10



does not exceed 95% b)

(Addition) to NEMA PB 1 and UL 67: For a period of 1 month, does not exceed 90%.

7.2.4

(Addition) to NEMA PB 1 and UL 67: Relative humidity may be temporarily 100%.

7.2.5

(Addition) to NEMA PB 1 and UL 67: Exposure to the following: a)

Air-borne dust concentration of 1 mg/m³ with 95% of all particles less than 20 micrometers in diameter. Dust includes compounds of calcium, sodium, magnesium, silicon, and aluminum. “

b)

7.3

8

”

Pollutants such as H2S - 20 ppm, SO2 - 10 ppm, CO - 75 ppm, NOX - 5 ppm, hydrocarbons - 100 ppm, NaCl - 300 ppm and MgCl - 50 ppm.

(Addition) to NEMA PB 1 and UL 67: Panelboards shall be suitable for installation within the Electrical Area Classification indicated within Data within Data Schedule 1. Refer to Section to Section 5 for additional design criteria for these panelboards.

Rating 8.1

Rated Duty: Continuous.

8.2

(Modification) to NEMA PB 1, Section 2.10 and UL 67, Section 10.4: Rated Current (minimum): 100A Exception to 8.2: 63 A is the minimum current rating for the flameproof panelboards. panelboards .

8.3

9

(Modification) to NEMA PB 1, Section 3.5 and UL 67, Section 31.1.1: Short Circuit interrupting interrupting rating (minimum): 10 kA rms

Enclosures 9.1

Enclosures shall bear labels from a third party testing laboratory (i.e., UL, CSA, BASEEFA, KEMA, etc.) indicating that they are d esigned, constructed and tested to the applicable standards referenced within this specification.

9.2

Enclosures of panelboards installed outdoors shall have the following characteristics: 9.2.1

When severe corrosive environment is specified within Data within Data Schedule 1, “

”

Saudi Aramco: Company General Use Page 6 of 10



the enclosure design shall be either: a)

Type 4X per NEMA 250. Exception to 9.2.1: Galvanized and/or painted or coated carbon steel sheet metal material shall not be used.

9.2.2

b)

(Modification) to NEMA PB 1, Section 5.8.1 and UL 67 Section 11A.2.4: Type 3 or 4 per NEMA 250 and manufactured of copper free cast aluminum or plastic.

c)

IP6X per IEC IEC 60529 and manufactured of stainless steel, copper free free cast aluminum or plastic.

If a severe corrosive environment , is not specified, it is acceptable that the panelboard enclosure meet the requirements of either: “

a)

(Modification) to NEMA PB 1, Section 5.8 and UL 67 Section 11A.2.4: Type 4, 4X, 6, 6P, 3/7, 4/7 or 4X/7 per NEMA 250.

b)

(Modification) to NEMA PB 1, Section 5.8.1 and UL 67 Section 11A.2.4: Type 3 per NEMA 250 and manufactured of copper free cast aluminum, plastic or galvanized carbon sheet metal.

c)

IPYX per IEC 60529. Where W here Y shall be the numeral 5 or 6 and X shall be a numeral between 4 and 8 inclusive. ‘

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9.2.3

9.3

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(Addition) to NEMA PB 1 and UL 67: Enclosures rated Type 3, 4 or 4X per NEMA 250 shall be equipped with Type 300 Series stainless steel hardware.

(Addition) to NEMA PB 1 and UL 67: Panelboards specified as being installed outdoors and having and internal volume exceeding 2,000 cm³ shall be provided with Type 300 Series stainless steel breather and drain fittings. Exception to 9.3: Thin wall (sheet metal or plastic) enclosures may be drained by drilling a 5 mm hole in the bottom of the enclosure.

10

Conductors 10.1

(Modification) to NEMA PB 1, Section 5.3.3.4 and UL 67, Section 10.1.1: All conductors shall be copper, silver, or alloys of these materials with the following exceptions: 10.1.1 Parts which are internal to a pre-manufactured device (e.g., internals internals Saudi Aramco: Company General Use Page 7 of 10



circuit breaker). 10.1.2 Connectors supplied as integral parts or components of manufactured manufactured equipment such as molded case circuit breakers provided the connectors are approved for copper conductors. 10.1.3 Plating of the the copper, silver, or copper/silver copper/silver alloy base conductor material is acceptable. 10.2

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The main circuit bus system shall be of rigid material (i.e., cable or flexible conductors shall not be used).

Ground ing (Earth (Earth ing) A ground bus shall be provided within the panelboard.

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Switch ing Devices Devices 12.1

(Addition) to NEMA PB 1 and UL 67: If the breaker size is not specified specified within the purchasing documents, breakers shall have a minimum trip rating of 20 A.

12.2

(Addition) to NEMA PB 1 and UL 67: Breakers operating at greater greater than 240 Volts shall be equipped with padlockable lock-off devices.

12.3

(Addition) to NEMA PB 1 and UL 67: Tandem, twin, or half-size breakers shall not be used .

12.4

(Addition) to NEMA PB 1 and UL 67: When main circuit disconnectors are used, they shall be sized to allow a llow the main bus to be operated o perated at its full current rating.

12.5

(Addition) to NEMA PB 1 and UL 67: Panelboards shall shall be equipped with with a minimum of 10% spare breakers and a minimum of 10% spare pole spaces. If not indicated in the engineering documents, the sizes of the spare breakers shall be representative of the connected breakers within the panelboards. Exception to 12.5: The explosionproof panelboards shall be completely filled with breakers.

12.6

(Modification) to NEMA PB 1, Section 2.8.1 and UL 67, Section 13.1: Ground fault protective functions shall not be installed on any incoming or outgoing circuits. Exception: Branch circuit Ground fault Circuit Interrupters (GFCIs) with nominal 5 mA trip Saudi Aramco: Company General Use Page 8 of 10



levels or Equipment Protection Devices (EPDs) with nominal 30 mA trip level or residual current devices (RCDs) with 5 to 30 ma trip levels are allowed.

13

Nameplates (Modification) to NEMA PB 1, Section 5.1.1 and UL 67, Section 32: White Nameplates with black lettering shall be provided to identify the panelboard with the tag number indicated within Data within Data Schedule 1.

Revision Revision Summary 24 August 2016

Major revision per the management directive to optimize company standards by maximizing alignment with international standards.




Data Schedule 1 For 16-SAMSS-518: Low Voltage Panelboards (Information to be supplied to Supplier) Line # 1

Buyer s Quotation Request/ Purchase Order No. ’

______________________________________________________ ____________________________________ __________________ 2

Buyer s B.I./J.O. No.________, Line Item No.___________

3

Panelboard Tag No.__________________________

’

Service information: 20

Indoor: _____, Outdoor _____

22

Electrical Area Classification: Unclassified ____

23

Classified ____: Class ___ Division ___, Group(s) ____ or Class ___ Zone ___, Group(s) ___

30

Severe Corrosive Environment(1): YES ___, NO ___

33

System frequency:

60 Hz _____, 50 Hz _____, DC _____

If AC, Number of Phases/Wires 1/2___, 1/3___, 3/3 ____, 3/4 ___ 35

UPS service: YES ___, NO ____

40

Rated Current:

43

Rated Voltage: _______________

50

Minimum ambient air temperature (if lower than 0°C) _______ °C

53

Site altitude (if greater than 1000 meters) _________ meters

70

Neutral bus required:

72

_______ A 41

Short Circuit Interrupting Rating: _________ kA (10 kA minimum)

YES ___, NO ___

If YES, rated current of neutral bus as a % of phase bus: 100% ___, 200% ___

74

Main Main circui t disconnector required: YES ___, NO ____:

76

Main Main circ uit supply uit supply conductor connectors (if applicable): applicable): Supplied Supplied by Supplier: YES ( ), NO ( )

77

If YES: No./phase and size of main circuit supply circuit supply conductors:

78 79

_____ /ph., ______ AWG, MCM, mm² Branch circuit breaker requirements: Quantity Poles Trip Rating _________________________________ _________________________________ _________________________________ _________________________________ _________________________________

80 81 82 83 84 85

OR

Notes to Buyer:

_____ (1)

refer to the engineering documents

Refer to SAES-P-100 for definition of Severe Corrosive Environment.


16-SAMSS-518_24 Aug 2016

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