Significant changes to NFPA 79 2015 Electrical Standard for Industrial Machinery

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Table of Technical/Substantive
Changes from the 2012 Edition to the 2015 Edition of NFPA 79

2012 Edition

2015 Edition

Comments

Global deletion of parenthetical terms used to describe IEC terms
  from 6.4.1.1(2); 8.1.2; 8.2; 8.2.1; 8.2.1.1; 8.2.1.2; 8.2.2; 8.2.3; 8.2.3.1;
  8.2.3.2; 8.2.3.5.1; 8.2.3.5.2; 8.2.4, 8.4.2; 9.1.1.2; 13.2.2.1;
  13.4.5.3(1)  and (2); 15.1.1(5); 18.1;
  18.2; 18.3; 18.4; Table 18.2; A.3.3.9; A.3.3.77.

 

 

 

Chapter 1

  1. 1.1.1
  2. 1.1.1

Added “circuit conductors” following supply to clarify scope.

Chapter 2

  1. 2.2
  2. 2.2

Updated referenced standards to latest editions.

  1. 2.3.6
  2. 2.3.6

Added ANSI/UL 50E referenced standard and updated others to latest
  editions.

  1. 2.4
  2. 2.4

Updated referenced standard to latest editions.

Chapter 3

  1. 3.3.4   
  2. 3.3.5

Removed extract reference.

  1. 3.3.9   
  2. 3.3.10

Annex reference (asterisk) removed.

  1. 3.3.15 

Deleted definition of cable
  trunking system.

  1. 3.3.19.4
  2. 3.3.19.4

Revised definition of liquidtight
  flexible nonmetallic conduit (LFNC):
last sentence deleted and extract
  removed.

  1. 3.3.28  
  2. 3.3.28

Updated definition of device
  to correlate with change in the NEC
  2014 to retain extract.

  1. 3.3.32  

Deleted definition of duct.

  1. 3.3.34  

Deleted definition of earth
  as it is already used in the definition of ground and is unnecessary.

  1. 3.3.42  
  2. 3.3.40

Deleted extract because definition of exposed (as applied to live parts) does not match NEC definition.

  1. 3.3.48   
  2. 3.3.46

Revised definition of grounded
  (grounding)
to match NEC 2014.

  1. 3.3.50   

Deleted definition of grounding
  conductor.

  1. 3.3.51   
  2. 3.3.48

Revised definition of grounding
  conductor, equipment (EGC)
to match NEC
  2014.

  1. 3.3.56  
  2. 3.3.54

Revised definition of industrial
  machinery (machine)
to match NEC
  2014.

  1. 3.3.53  

Added new definition of industrial
  control panel
from NEC 409.2.

  1. 3.3.61   
  2. 3.3.59

Revised definition of in sight
  from (within sight from, within sight)
to match NEC 2014.

  1. 3.3.70   

Added new definition of overcurrent
  protective device, branch-circuit.

  1. 3.3.74  

Deleted definition of positive opening operation (of a contact
  element)
because
direct
  opening operation
(3.3.30) is used in the standard. There should not be
  two terms essentially identically defined.

  1. 3.3.77

Definition of protective
  bonding circuit
was removed from Chapter 3 and relocated to new Annex J,
  as it is only used as a parenthetical term.

  1. 3.3.81
  2. 3.3.77

Revised definition of receptacle  to match NEC 2014.

  1. 3.3.94 
  2. 3.3.90

Revised definition of   short-circuit current rating to match NEC 2014.

  1. 3.3.98   

Deleted definition of subassembly
  as it is not currently used in the requirements of the standard.

  1. 3.3.97   

Added new definition of surge
  protective device (SPD)
to match NEC
  2014.

  1. 3.3.100
  2. 3.3.95

Revised definition of  overcurrent protective device,
  supplementary
to match NEC
  2014.

  1. 3.3.110
  2. 3.3.106

The extract was removed from the definition of voltage, nominal.

Chapter 4

No substantive changes

Chapter 5

  1. 5.3.1.1  
  2. 5.3.1.1  

Added exception to exclude circuits of less than 50 volts from the
  disconnect requirement.

  1. 5.3.1.3  
  2. 5.3.1.3  

Add new exception, and the word "the" was changed to
  "each" to clarify it would apply to each supply circuit disconnecting
  means.

  1. 5.3.1.4
  2. 5.3.1.4

The additional language in the exception to 5.3.1.4 clarifies the
  intent of 5.3.1.3 that only separately mounted disconnects for small machines
  totaling 2 hp or less are not required to be interlocked with the control enclosures
  in accordance with 6.2.4. The second sentence was changed to an exception to
  clarify where interlocking is permitted.

  1. 5.3.2(2)
  2. 5.3.2(2)

Deleted “branch circuit–rated.” All listed molded case circuit breakers
  are “branch circuit overcurrent protective devices.”

  1. 5.3.3.2(3)
  2. 5.3.3.2(3)

Removed parenthetical terms for clarity.

Chapter 6

  1. 6.1
  2. 6.1

Revised text. The 2012 language could be interpreted to require that
  the equipment must be designed to protect person(s) from arc flash hazards.
  The revised language is to warn a person(s) of arc flash hazard potential.
  The asterisk was added to point the user to the annex to provide information
  that the requirements of Chapter 6 inherently reduce the likelihood that an
  arc-flash event will occur.

  1. 6.5.3.2
  2. 6.5.3.2

Revised definition of means of
  discharge
to match NEC 2014.

  1. 6.6
  2. 6.6

Revised title of section to clarify the purpose of this section. The
  purpose is to require an arc flash warning sign to warn qualified person(s)
  of a potential arc flash hazard.

Chapter 7

  1. 7.2.1.2
  2. 7.2.1.2

Added “overcurrent” before “protection device” for clarity.

  1. 7.2.4.2.5
  2. 7.2.4.2.5

Changed “are not considered” to “shall not be considered” to provide
  mandatory language.

  1. 7.2.5
  2. 7.2.5

Parenthetical term socket
  removed for clarity.

  1. 7.2.8(1)(e)
  2. 7.2.8(1)(e)

Deletion of “rated” and addition of “overcurrent” adds clarity. An
  acceptable branch circuit overcurrent protective device is determined by the
  requirements of Chapter 7.

  1. 7.2.10.3
  2. 7.2.10.3

Changed is to shall be to provide mandatory  language.

  1. 7.8.1, 7.8.2, 7.8.3
  2. 7.8.1

The term surge protection
  devices (SPDs)
replaced the previously used term of overvoltage protection device, lightning overvoltage suppression, and surge switching overvoltage suppression
  in 7.8.1, 7.8.2, and 7.8.3.

  1. 7.8.3

  1. Surge protection devices are installed by choice and the
      designer or installer should be permitted to decide where to connect them in
      accordance with the manufacturer’s instructions.

  1. 7.8.3

Added types of SPDs and suitable installation locations for each type.

Chapter 8

  1. 8.1 (A.8.1)
  2. 8.1 (A.8.1)

With the removal of parenthetical IEC terminology, A.8.1 has been changed
  to direct the user to the new Annex J.

  1. 8.2
  2. 8.2

Parenthetical term removed for clarity.

  1. 8.3.1
  2. 8.3.2

Parenthetical term removed for clarity.

  1. 8.4.2
  2. 8.4.2

Parenthetical term removed for clarity.

Chapter 9

  1. 9.1.1.2
  2. 9.1.1.2

Parenthetical term removed for clarity.

  1. 9.2.2
  2. 9.2.2

Revised to clarify that de-energization may not always be possible.

  1. 9.2.5.3.1

Deleted, as the requirement for a Category 0 stop is redundant with
  the requirements of 9.5.3.2 and aligns with similar requirements in IEC
  60204-1. The text in 9.2.5.3.2 became the text of 9.2.5.3.1.

  1. 9.2.5.4.2.1
  2. 9.2.5.4.2.1

The revised text clarifies that any or all of the conditions listed
  are acceptable for use of emergency switching off.

  1. 9.3.6
  2. 9.3.6

The committee deleted the definition of positive opening operation; therefore, the use of the term was
  deleted to be consistent with the existing defined term direct opening operation.

  1. 9.4.2
  2. 9.4.2

Parenthetical term removed for clarity.

  1. 9.4.2.1
  2. 9.4.2.1

Parenthetical term removed for clarity.

  1. 9.4.3.2
  2. 9.4.3.2

Deleted reference to improper annex note. The note pertains to design
  of control system using software and firmware based controllers (9.4.3.4.2)

  1. 9.4.3.4
  2. 9.4.3.4

Added reference to annex note, previously incorrectly ascribed to
  9.4.3.2. Paragraph 9.4.3.4 deals with software and firmware based controllers
  and is the correct location for the annex note.

Chapter 10

  1. 10.7.4.1
  2. 10.7.4.1

Revised text. All of the supply disconnecting means identified in
  5.3.2(1) through 5.3.2(5) can be equipped with suitable external operating
  means to serve as an emergency stop. Only where it is a plug and cord should
  it not be permitted.

Chapter 11

  1. 11.2.1.5.1
  2. 11.2.1.5.1

New exception added stating that these thread engagements are
  suitable to attach covers. UL 50 and UL 508A 66.1.9 define this thread
  engagement as suitable for mounting equipment to subpanels.

  1. 11.3.2
  2. 11.3.2

Added "required for the environment" for clarity. Also,  the term Type is what is commonly used to refer to the degree of
  protection for enclosures; therefore, the reference to “NEMA” is not needed
  and was removed.

  1. 11.4.2
  2. 11.4.2

Revised to reference UL 50 and UL 50E.

  1. 11.5
  2. 11.5

Revised to correlate the NFPA 79 requirements with the Informational
  Note to 670.1 in the NEC.  An (*) was added to point to the newly
  added annex A material.

  1. 11.5.1.2
  2. 11.5.1.2

The term cabinets and
  compartments
is used to be consistent with the terminology within the
  document.

Chapter 12

Table 12.5.5

Table 12.5.5

Added 60°C and 90°C columns to the table.

  1. 12.5.5
  2. 12.5.5

The term derating was
  deleted and the remaining language was changed to be consistent with the use
  of the terms adjustment factors and
  correction factors in the standard.

  1. 12.6.1.1/ 12.6.1.2
  2. 12.6.1.1/ 12.6.1.2

Added Class CF fuses to the permitted fuse types listed since Class
  CF fuses have the same performance requirements as Class J fuses. Also this
  change clarifies the meaning of “full-load ampacity” in 12.6.1.1(2),
  12.6.1.1(3), 12.6.1.2(2), and 12.6.1.2(3).

  1. 12.9.2
  2. 12.9.2

The revised language clarifies the intent of the 2012 change that any
  of the conditions of 1, 2, or 3 can be applied to demonstrate acceptable use
  of AWM.

Chapter 13

  1. 13.1.2.6
  2. 13.1.2.6

Removed parenthetical terms for clarity.

  1. 13.1.2.6
  2. 13.1.2.6

Removed parenthetical terms for clarity.

  1. 13.1.3
  2. 13.1.3

Removed parenthetical terms for clarity.

  1. 13.1.4
  2. 13.1.4
  3. The additional text will further clarify the requirements
      are for the supply source circuits. The title was changed and text was added
      to the section to further clarify that the requirements are for situations
      where the equipment is supplied from multiple supply sources or circuits.
  4. 13.2.2
  5. 13.2.2

Removed parenthetical terms for clarity.

  1. 13.2.2.1
  2. 13.2.2.1

Removed parenthetical terms for clarity.

  1. 13.4.2
  2. 13.4.2

Removed parenthetical terms for clarity.

  1. 13.4.5.3
  2. 13.4.5.3

Removed parenthetical terms for clarity.

  1. 13.5
  2. 13.5

Removed parenthetical terms for clarity.

Chapter 14

No substantive changes

Chapter 15

  1. 15.1.1(5)
  2. 15.1.1(5)

Removed parenthetical term protective
  bonding
for clarity.

Chapter 16

  1. 16.2.3
  2. 16.2.3

ANSI reference was added to ensure that any warning sign used for
  shock and arc flash hazards comply with the guidance for such signs as
  provided by ANSI Z535.4.

  1. 16.2.7

  1. Requirements for arc flash marking are detailed in 16.2.3,
      16.2.3.1, and 16.2.3.2. Deleting the redundant section clarifies the language
      for the user.
  2. 16.4.1
  3. 16.4.1

Revised to allow the manufacturer of the machine to use alternate
  means of identifying the equipment. The revision to add “industrial” in front
  of control panel in this section correlate with Section 4.8.

Chapter 17

  1. 17.5
  2. 17.5

Removed parenthetical terms for clarity.

Chapter 18

  1. 18.1–18.4
  2. 18.1–18.4

Removed parenthetical terms for clarity.

Chapter 19

  1. 19.1
  2. 19.1

The revised text indicates that branch-circuit overcurrent
  protection, not just overload protection, is required for servo drives and
  motors. The manufacturer’s instructions for servo drives and motors indicate
  the type and size of branch-circuit overcurrent protection that is required
  in accordance with UL 508C. In addition, UL 508A already considers servo
  drives SCCR in the determination of the industrial control panel SCCR.

Annex A

  1. A.3.3.15

  1. The definition of the term cable trunking system was deleted from Chapter 3 and therefore
      the associated annex information is no longer necessary.
  2. A.3.3.32

  1. The definition of the term duct was deleted from Chapter 3 and therefore the associated
      annex information is no longer necessary.
  2. A.3.3.37

  1. The definition of the term protective bonding circuit was deleted from Chapter 3 and therefore
      the associated annex information is no longer necessary.
  2. A.3.3.85
  3. A.3.3.81

The text was revised to reflect latest changes to reference documents
  and to add reference to the ISO standard for risk assessment.

  1. A.4.1
  2. A.4.1

Added reference to NFPA 77 to provide guidance on the mitigation of
  static electricity.

  1. A.5.4.3
  2. A.5.4.3

Revised to reflect the latest changes to referenced documents.

  1. A.6.1

Added annex note to provide information to clarify the requirements
  of Section 6.1 as they pertain to arc-flash.

  1. A.6.3.1.1
  2. A.6.3.1.1

Removed parenthetical terms for clarity.

  1. A.8.1
  2. A.8.1

Revised to point user to new Annex J for IEC terms.

  1. A.9.2
  2. A.9.2

The revised text provides guidance that compliance to
  machine/application specific standards can require additional or specific
  functional safety requirements.

  1. A.9.4.1
  2. A.9.4.1

The text was revised to correct the reference to Annex H for guidance
  on risk reduction techniques and minimizing the probability of control
  function failure.

  1. A.9.2.2

Added new annex note.

  1. A.9.4.3.2
  2. A.9.4.3.4

Renumbered annex note, previously incorrectly ascribed to 9.4.3.2.
  Paragraph 9.4.3.4 deals with software and firmware based controllers and is
  the correct location for the annex note.

  1. A.11.5

New annex diagram to support working distance and scope of NFPA 79
  and NEC.

  1. A.14.1
  2. A.14.1

The reference to UL 1004 was deleted and replaced with ANSI/UL
  1004-1.

Annex B

No substantive changes

Annex C

  1. C.5
  2. C.5

Added “conveyors and conveying machines” to list of examples of
  industrial machinery.

Annex D

No substantive changes

Annex E

No substantive changes

Annex F

  1. F.2
  2. F.2

Revisions made for clarity and to be in compliance with the Manual of
  Style

  1. F.5.4
  2. F.5.4

Added new table that provides an IP table definition and a Type
  rating versus IP rating comparison, similar to the NEC.

Annex G

No substantive changes

Annex H

  1. H.2
  2. H.2

The committee deleted the definition of positive opening operation, and therefore the use of the term was
  deleted in Annex H.2. To be consistent the term direct opening operation replaced positive opening operation.

Annex I

No substantive changes

Annex J

New Annex J added with explanatory electrical terms.

Annex K

  1. J.1.1
  2. K.1.1

Added NFPA 77 as an informational reference for guidance on static
  electricity.

  1. J.1.2
  2. K.1.2

ANSI B11.TR3, Risk Assessment
  and Risk Reduction — A Guide to Estimate, Evaluate and Reduce Risks
  Associated with Machine Tools
, 2000, has been rolled into ANSI B11.0, Safety of Machinery – General Requirements
  and Risk Assessment
, 2010. Added ANSI B11.0, 2010, to provide the needed
  guidance to machine builders, modifiers, and end users.

  1. J.1.2.2
  2. K.1.2.2

Corrected the reference to EN 60204-1 and EN 61010-1.

  1. J.1.2.3
  2. K.1.2.3

Updated to reflect current revisions.

  1. J.1.2.5
  2. K.1.2.5

Revised, Reference dates for ISO publications were revised to reflect
  latest revisions needed for proper application.

  1. J.1.2.8
  2. K.1.2.8

The reference to UL 1004 was deleted and replaced with ANSI/UL
  1004-1. The other standards were updated to the most current editions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. A.9.2.5.3.1 Revised numbering

 

 

 

 




  1. F.5.3.1 Revision/MOS, The section as currently numbered does
    not comply with the NFPA Manual of Style which states that all subdivisions
    shall contain at least two subdivisions.

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