{"id":2011,"date":"2023-02-22T11:41:34","date_gmt":"2023-02-22T10:41:34","guid":{"rendered":"https:\/\/www.gt-engineering.it\/approfondimenti\/%tipologia_approfondimento%\/differences-beetween-fla-and-flc\/"},"modified":"2024-12-31T13:17:10","modified_gmt":"2024-12-31T12:17:10","slug":"differences-beetween-fla-and-flc","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/en\/insights\/ul-and-csa-conformity\/differences-beetween-fla-and-flc\/","title":{"rendered":"Differences beetween FLA and FLC"},"content":{"rendered":"\n\n \n \n \n
\n\n \n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
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\n

THE DOUBT<\/strong>:<\/p>\n

In North America, each motor has two current values:<\/p>\n

– Full-Load Ampere (FLA)<\/p>\n

– Full-Load Current (FLC)<\/p>\n

What are the differences and when are they used?<\/p>\n<\/div> <\/div>\n \n \n

<\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
\n\n \n
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\n \n \n

\n Full-Load Ampere (FLA) <\/h4>\n <\/div>\n <\/div>\n \n \n
\n \n
\n

DEFINITION:<\/strong><\/p>\n

The “FLA” is the rated current<\/strong> of the motor, the value that the IEC 60364 series of standards calls “Ib<\/sub>“.<\/p>\n

Normally, this value is indicated directly onto the nameplate of the motor. The acronym “IN<\/sub>” is used in the IEC 60034 series of motor product standards.<\/p>\n

In National Electrical Code (NEC), it is called the “Nameplate Value<\/strong>“.<\/p>\n

USE:<\/strong><\/p>\n

The “FLA” value is used to regulate the overload protection of the motor (note that it must be fixed to maximum 115% of the FLA, in case of overload protection separated from short circuit protection).<\/p>\n<\/div> <\/div>\n \n \n

<\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
\n\n \n
\n \n
\n \n \n

\n Full-Load Current (FLC) <\/h4>\n <\/div>\n <\/div>\n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
\n \n
\n

DEFINITION:<\/strong><\/p>\n

The "Full-Load Current" (FLC) is a standard value given in tables 50.1 (ac motors) and 50.2 (dc motors) of UL 508A standard (or from the tables 430.247, 430.248, 430.249 and 430.250 of the NEC).<\/p>\n

It is a current value associated with the power (HP) of the motor: to each "Horse Power" value corresponds a FLC value.<\/p>\n

Example: <\/strong>a 460-480 V three-phase motor has a nominal current (FLA) equal to 4,2 A (value declared by the manufacturer of the motor) and a "FLC" equal to 4,8 A (value given by the table 50.1 of UL 508A standard).<\/p>\n

 <\/p>\n

In the National Electrical Code (NEC), FLC is also called "Table Value".<\/p>\n

USE:<\/strong><\/p>\n

The "FLC" value is used to determinate short-circuit protection, cable size and the size of the main disconnecting device of a control panel.<\/p>\n

The "FLC" is not associated just to motors because UL 508A standard, at clause 52.1, requires that the FLC value of a control panel must be indicated onto its nameplate (once called FLA).<\/p>\n<\/div> <\/div>\n \n \n

<\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
\n\n \n
\n \n
\n \n \n

\n Notes <\/h4>\n <\/div>\n <\/div>\n \n \n
\n \n
\n

In the past, the UL 508A standard defined the FLC as "Full-Load Ampere Rating". But in the NFPA 79 standard, this value was called "Full-Load Current".<\/p>\n

Since the term "Full-Load Ampere Rating" could be confused with the term "FLA" (but, in reality, instead it was meant FLC), GT Engineering, as a member of the UL 508A working group, proposed some modifications to the UL 508A standard<\/a>, in order to align the use of the terms "FLA" and "FLC" to NEC and to the NFPA 79 standard.<\/p>\n<\/div> <\/div>\n \n \n

<\/div>\n \n\n <\/div>\n <\/section>\n\n \n","protected":false},"excerpt":{"rendered":"

THE DOUBT:<\/p>\n

In North America, each motor has two current values:<\/p>\n

– Full-Load Ampere (FLA)<\/p>\n

– Full-Load Current (FLC)<\/p>\n

What are the differences and when are the…<\/p>\n","protected":false},"author":1,"featured_media":33790,"parent":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[50],"class_list":["post-2011","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-ul-and-csa-conformity"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"\nDifferences beetween FLA and FLC<\/title>\n<meta name=\"description\" content=\"THE DOUBT: In North America, each motor has two current values: <p st...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gt-engineering.it\/en\/insights\/ul-and-csa-conformity\/differences-beetween-fla-and-flc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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