Circuit_Total_Limitation_(CTL)
Circuit total limitation
Present-day standards for electrical panels
Circuit total limitation (CTL) is one of the present-day standards for electrical panels sold in the United States according to the National Electrical Code. This standard requires an electrical panel to provide a physical mechanism to prevent installing more circuit breakers than it was designed for. This has generally been implemented by restricting the use of tandem (duplex) breakers to replace standard single pole breakers.
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