1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): WEVZStandard Number: UL 891Standard Title: Standard for SwitchboardsEdition Date: July 26, 2005Edition Number: 11Section / Paragraph Reference: 6.2.1, 6.2.16
3、, 8.6.14, 8.8.4Subject: Inclusion of Inlet/Outlet Requirements for SwitchboardsDECISION:6.2.1.12.2 Switchboards with inlets shall be marked with an additional short circuit current rating for theswitchboard when connected to the inlets.Note: When powered by an alternate source that is connected usin
4、g input connections in accordance with8.8.4.2, the source may provide less available current than that of the “normal” (utility fed) source. Portions ofthe switchboard circuit which will only be powered when connected to the alternate source, such as the inputconnections, may have short circuit curr
5、ent ratings less than the rating of the entire assembly.6.2.1.15.4 For switchboards with inlets and an additional short circuit current rating as specified in6.2.1.12.2, that portion of the switchboard circuit which will only be powered when connected to thealternate source may include components wi
6、th short circuit current ratings less than the rating marked onthe section or interior, but not less than the rating noted in 6.2.1.12.2.6.2.16 Switchboards with provisions for cord connections6.2.16.1 Switchboards provided with single pole separable connectors (input or output connections) thatare
7、not mechanically interlocked shall be marked:a) FOR USE BY QUALIFIED PERSONNEL ONLY, or equivalent, andb) With instructions as to the proper order of connection and disconnection, as noted in thebelow example:WARNING - Risk of Electric ShockPlug connection should be in the following order;1) Equipme
8、nt grounding conductor connectors;2) Grounded circuit conductor connectors; and3) Ungrounded conductor connectors.Disconnection should be in the reverse order.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL6.2.16.2 The marking required by 6.2
9、.16.1 shall be located adjacent to the point of connection.6.2.16.3 Switchboards with inlets shall be marked to indicate the type of derived system that theswitchboard is intended to interconnect in accordance with either (a) or (b):a) Switchboards that do not switch the neutral conductor shall be m
10、arked with the following:“WARNING - For Connection of a Nonseparately Derived (Floating Neutral) System Only.”b) Switchboards that switch the neutral conductor shall be marked with the following:“WARNING - For Connection of a Separately Derived (Bonded Neutral) System Only”6.2.16.4 Switchboards with
11、 inlets shall be marked to indicate the short circuit current rating when theswitchboard is powered by a source that is connected through the use of the inlets. See 6.2.1.12.2.8.6.14 Receptacles Relocated to Section 8.8.4.3.18.6.14.1 A receptacle shall be rated for the voltage involved and shall be
12、of the type having a terminalintended for use only with an equipment grounding conductor.8.6.14.2 Overcurrent protection for a receptacle branch circuit shall be provided within the section or inanother section of a group of sections intended to be used together.8.6.14.3 A single receptacle installe
13、d on an individual branch circuit shall have an ampere rating of notless than that of the branch circuit.8.6.14.4 A duplex receptacle or two or more receptacles on the same branch circuit shall have overcurrentprotection equal to the individual receptacle rating.8.6.14.5 A receptacle in a switchboar
14、d marked “Type 3R” shall comply with 8.2.1.5.1, 8.6.14.8, and8.6.14.9.8.6.14.6 After installation a receptacle face shall project a minimum of 0.38 mm (0.015 in) from thefaceplate or surrounding cover. A faceplate shall be installed so as to seat against a mounting surface.8.6.14.6.1 The receptacle
15、face may be flush with, or project from, a faceplate or surrounding cover ofinsulating material.8.6.14.7 A receptacle installed in a switchboard section shall be located so that neither an attachment plugmounted in the receptacle nor the flexible cord will be likely to interfere with the operation o
16、f any switchor circuit breaker handle. (Note: Relocated to 8.8.4.1.2)8.6.14.8 Class A ground-fault circuit interrupter protection shall be provided for all 130 V and less,single-phase, 15- or 20 A receptacles used in a switchboard marked as having a Type 3R enclosure orintended for outdoor use.8.6.1
17、4.9 All 15- and 20-ampere, 125- and 250-volt nonlocking receptacles used in a switchboard markedas having a Type 3R enclosure or intended for outdoor use shall be rated as “weather-resistant” type.8.8.2.1.1 A terminal (pressure wire connector or wire-binding screw) shall be provided for connection o
18、feach conductor intended to be field-installed in the switchboard section or interior. Connections may beprovided for cord-connected equipment, see Cord-Connectors, Clause 8.8.4.8.8.4 Cord-ConnectorsSTANDARD NUMBER: UL 891 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBU
19、TION WITHOUT PERMISSION FROM UL8.8.4.1 General8.8.4.1.1 If provided with connections for cord-connected equipment, connectors shall comply with Clause8.8.4, Cord-Connectors.8.8.4.1.2 Connections for cord-connected equipment shall be located so that neither the connectormounted in an input or output
20、connector, nor the flexible cord attached to the connector, will be likely tointerfere with the operation of any switch or circuit breaker handle.8.8.4.1.3 An opening through which field installed wiring may pass shall be provided with a bushing orshall be formed so that there are no sharp edges wit
21、h which conductors may come in contact.8.8.4.1.4 All field wiring conductors of an alternating-current circuit that pass through a wall or partition ofmetal having magnetic properties, including the neutral, shall be run through the same opening. See8.8.1.8.6.8.8.4.1.5 An integral multiple pole conn
22、ector shall have sufficient number of poles to accommodate theground, neutral, and all ungrounded supply conductors in one connector. When single pole separableconnectors are provided, there shall be a sufficient number to accommodate the ground, neutral, and allungrounded supply conductors, and the
23、se connectors shall be grouped together.8.8.4.1.6 An integral multiple pole connector shall be of a design such that the ground connection is thefirst connection made when inserting a connector, and is the last connection to be opened when removingthe connector.8.8.4.1.7 Multipole inlets rated below
24、 200 A shall be suitable for connection and disconnection under load.8.8.4.2 Input connections8.8.4.2.1 An integral multiple pole inlet or single pole separable connector shall be of a construction withmale phase and neutral mating contacts, and shall have a rating no less than the rating of the ove
25、rcurrentdevice to which it is connected.8.8.4.2.2 Inlets shall be arranged such that the current carrying parts of the inlet are energized only whena mating attachment connector is connected to the inlet.8.8.4.2.3 Switchboards with an inlet shall be rated for outdoor use in wet locations and shall c
26、omply withthe requirements for Type 3, 3R, 3S, 4, or 4X enclosures, as detailed in Clause 8.2.1.4, Enclosure, withthe cord connector installed as well as with the connector removed.8.8.4.2.4 Single pole separable connectors shall be mechanically interlocked in such a manner that plugsmust be connect
27、ed in the following sequence and disconnected in the reverse order:a) Equipment-grounding conductor connection;b) Grounded circuit conductor connection; andc) Ungrounded conductor connection8.8.4.2.4.1 Switchboards with separable single pole connectors rated above 200 A need not comply with11A.2.5 w
28、hen marked in accordance with 32.17.1and 32.17.2.STANDARD NUMBER: UL 891 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.8.4.2.4.1 Switchboards with an inlet shall be provided with branch circuit protection for the circuitssupplied throug
29、h the inlet. The rating of the branch circuit protection shall not be greater than the ratingof the inlet.8.8.4.3 Output connections8.8.4.3.1 Multiple pole outlets (receptacles)8.8.4.3.1.1 A receptacle shall be rated for the voltage involved and shall be of the type having a terminalintended for use
30、 only with an equipment grounding conductor.8.8.4.3.1.2 Overcurrent protection for a receptacle branch circuit shall be provided within the section or inanother section of a group of sections intended to be used together.8.8.4.3.1.3 A single receptacle installed on an individual branch circuit shall
31、 have an ampere rating of notless than that of the branch circuit.8.8.4.3.1.4 Where connected to a branch circuit supplying two or more receptacles (including a duplexreceptacle), receptacle ratings shall comply with the values listed in Table 33A.Table 33AReceptacle ratings when branch circuit supp
32、lying two or more receptacles(8.8.4.3.1.4)Branch circuit rating, A Receptacle rating, A15 Not over 1520 15 or 2030 3040 40 or 5050 and higher Receptacle rating shall not be less than the branch circuitrating8.8.4.3.1.5 A receptacle in a switchboard marked “Type 3R” shall comply with 8.2.1.5.1, 8.8.4
33、.3.1.7, and8.8.4.3.1.8.8.8.4.3.1.6 After installation a receptacle face shall project a minimum of 0.38 mm (0.015 in) from thefaceplate or surrounding cover. A faceplate shall be installed so as to seat against a mounting surface.8.8.4.3.1.6.1 The receptacle face shall be flush with, or project from
34、, a faceplate or surrounding cover ofinsulating material.8.8.4.3.1.7 Class A ground-fault circuit interrupter protection shall be provided for all 130 V and less,single-phase, 15- or 20-ampere receptacles used in a switchboard marked as having a Type 3R enclosureor intended for outdoor use.8.8.4.3.1
35、.8 All 15- and 20-ampere, 125- and 250-volt nonlocking receptacles used in a panelboard markedas having a Type 3R enclosure or other Type designation intended for outdoor use shall be rated asweather-resistant type.8.8.4.3.2 Single pole separable outletsSTANDARD NUMBER: UL 891 -4-UL COPYRIGHTED MATE
36、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8.8.4.3.2.1 A single pole separable connector shall be of a construction with female phase and neutralmating contacts, and shall have a rating no less than the rating of the overcurrent device to which it isconnect
37、ed.8.8.4.3.2.2 Overcurrent protection for single pole separable outlets shall be provided within the section orin another section of a group of sections intended to be used together.8.8.4.3.2.3 Single pole separable connectors shall be mechanically interlocked in such a manner thatplugs must be conn
38、ected in the following sequence and disconnected in the reverse order:a) Equipment-grounding conductor connection;b) Grounded circuit conductor connection; andc) Ungrounded conductor connection8.8.4.3.2.3.1 Switchboards with separable single pole connectors rated above 200 A need not comply with8.8.
39、4.3.2.2 when marked in accordance with 6.2.16.1RATIONALE FOR DECISION:This Certification Requirement Decision (CRD) adds requirements to address the interconnection ofswitchboards using cord-connectors (inlets and outlets). Requirements were added to the UL Standard forTransfer Switches, UL 1008, an
40、d UL Standard for Panelboards, UL 67, to address similar situations. ThisCRD incorporates requirements comparable to those adopted in UL 1008 and UL 67 to address theinclusion of cord-connectors on switchboards. Among the provisions included in this CRD are:1) Creation of a new Section for Cord-Conn
41、ectors (New Section 8.8.4).2) Relocation of requirements for Receptacles from Section 8.6.14 to 8.8.4.3.1 for receptaclespecific requirements.3) General provisions to ensure applications intended for the connection of cord-connectedequipment does not interfere with the operation of switches or circu
42、it breakers (presentlycovered in 8.6.14.7, relocated to 8.8.4.1.2 as a general requirement for all, does not result ininductive heating, or pose an increased risk of damage to the routing of conductors in areascontaining sharp edges.4) Inclusion of a 200 A threshold for the use of single pole inlets
43、, above this limit single poleinlets would be allowed provided the appropriate requirements are met, including a marking thatonly qualified personnel work on the equipment. For switchboards rated 200 Amps or less, aninterlock would be required to ensure that connections are made correctly and safely
44、 (sameampacity threshold adopted in UL 1008).5) Requirement that switchboards with an integral inlet be provided with a marking to indicatethe type of derived system that the system is capable of connecting with (reference 2014 NEC,Section 702.7(C).6) Inclusion of a separate Short Circuit Current Ra
45、ting for the switchboard when connected tothe inlets.Copyright 2016 Underwriters Laboratories Inc.STANDARD NUMBER: UL 891 -5-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUL, in performing its functions in accordance with its objectives, doe
46、s not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do no
47、t represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including con
48、sequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 891 -6-
