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Codes and Regulations

The use of generators are regulated by many different organizations depending upon the application and location of the installation or use. It is important to understand the rules and the practical application of the codes in order to effectively serve your customers. General outlines of the regulatory environment are provided as a general courtesy from WINCO and the information posted here is not an acceptable substitute for a competent electrician, engineer or other professional.

When determining how to apply any national code or standard it is important to recognize that most codes allow the Authority Having Jurisdiction the discretion in how the rules are applied. It is important to know which jurisdiction or inspector is responsible for your particular installation or jobsite to ensure you are complying with the proper local rules. 

Underwriters Laboratories (UL): Since 1894 UL has been setting product safety standards and providing testing services. The company is divided into a "for profit" and "not for profit" entities. The "not for profit" entity creates product standards while the "for profit" entity sells the UL mark and testing services to companies that are required to comply with the standard that the "not for profit" creates.

Electrical Testing Laboratory (ETL): WINCO and WINPOWER use the ETL marking for all our UL2200 projects. ETL is a Nationally Recognized Testing Laboratory (NRTL) recognized by OSHA. This authorizes ETL to provide third party verification testing to certify compliance with various standards including UL and CSA standards.

UL2200 Stationary Engine Generator Assemblies: This safety standard developed by UL governs stationary generator sets. WINCO certifies to this standard with the ETL mark on the Packaged Standby Series generators.

UL1008 Transfer Switch Equipment: This UL standard governs the construction and installation of all transfer switches and bypass isolation switches.

UL1004-1 Standard For Rotating Electrical Machines-General Requirements: The UL listed WINCO two-bearing generators are certified to this standard.

UL1004-4 Standard For Electric Generators: The UL listed WINCO two-bearing generators are certified to this standard.


Environmental Protection Agency (EPA): WINCO and WINPOWER are proud to manufacture our products with processes that do not require any EPA air permits. Every engine driven generator set we manufacture and sell meet current EPA air quality regulations. Legal use of generator systems depend upon emissions certification level and the intended use of the generator set. Consult WINCO and WINPOWER sales and engineering experts for specific application information.

California Air Resource Board (CARB): This board creates and enforces regulations pertaining to air quality in the State of California. The state is also divided into 35 other local air districts that have the authority to create additional regulations on generator use and installation. Some WINCO products clearly meet CARB regulations for sale in the state, and as a result, are labeled as such. Other products like diesel generators and large spark ignited generators may or may not be legal for permitting in California depending upon many factors such as application, expected annual hours of use and location. It is essential that the customer or their representative perform adequate due diligence by consulting CARB and the the local air districts authorities before finalizing the purchase on the generator. WINCO and WINPOWER are able to provide emissions standards data, but do not guarantee that any product not labeled CARB on its specification sheet is acceptable for use in California.

National Fire Protection Association (NFPA): The NFPA was formed in 1896 as a trade group with fire insurance companies. Standards have been developed that touch on almost every aspect of building and construction, including electrical codes. Click here to visit the NFPA website where complete copies of the code are available to the public.

NFPA 70 National Electric Code (NEC): These national electrical standards govern almost everything electrical including permanent, temporary and jobsite generator installations. The NEC is the basis for most local electrical inspector's jobsite requirements.
NFPA 110 Emergency and Standby Power Systems: Sets the standard for emergency power supplies for vital facilities such as hospitals, nursing homes, utility operations, and emergency response resources. An overview of code requirements and considerations is available by clicking on the title.