Nrtl Listing; Nfpa 79 - Siemens SINAMICS V90 Operating Instructions Manual

The application of standards is regulated in 29 CFR 1910.5 "Applicability of standards". The
concept is similar to that used in Europe. Product-specific standards have priority over
general standards insofar as they cover the relevant aspects. Once the standards are
fulfilled, employers can assume that they have fulfilled the core requirements of the OSH Act
with respect to the aspects covered by the standards.
In conjunction with certain applications, OSHA requires that all electrical equipment and
devices that are used to protect workers be authorized by an OSHA-certified, "Nationally
Recognized Testing Laboratory" (NRTL) for the specific application.
In addition to the OSHA regulations, the current standards defined by organizations such as
NFPA and ANSI must be carefully observed and the extensive product liability legislation
that exists in the US taken into account. Due to the product liability legislation, it is in the
interests of manufacturing and operating companies that they carefully maintain the
applicable regulations and are "forced" to fulfill the requirement to use state-of-the-art
technology.
Third-party insurance companies generally demand that their customers fulfill the applicable
standards of the standards organizations. Self-insured companies are not initially subject to
this requirement but, in the event of an accident, they must provide verification that they
have applied generally-recognized safety principles.
8.1.3.2

NRTL listing

To protect employees, all electrical equipment used in the USA must be certified for the
planned application by a "Nationally Recognized Testing Laboratory" (NRTL) certified by the
OSHA. NRTLs are authorized to certify equipment and material by means of listing, labeling,
or similar. Domestic standards (e.g. NFPA 79) and international standards (e.g. IEC/EN
61508 for E/E/PES systems) are the basis for testing.
8.1.3.3

NFPA 79

Standard NFPA 79 (Electrical Standard for Industrial Machinery) applies to electrical
equipment on industrial machines with rated voltages of less than 600 V. A group of
machines that operate together in a coordinated fashion is also considered to be one
machine.
For programmable electronics and communication buses, NFPA 79 states as a basic
requirement that these must be listed if they are to be used to implement and execute safety-
related functions. If this requirement is fulfilled, then electronic controls and communication
buses can also be used for Emergency Stop functions, Stop Categories 0 and 1 (refer to
NFPA 79 9.2.5.4.1.4). Like EN 60204-1, NFPA 79 no longer specifies that the electrical
energy must be disconnected by electromechanical means for emergency stop functions.
The core requirements regarding programmable electronics and communication buses are:
system requirements (see NFPA 79 9.4.3)
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002
Safety Integrated function
8.1 Standards and regulations
247