What is the maximum length allowed for a flexible cord supplying a 120-volt room air conditioner?

The maximum length allowed for a flexible cord supplying a 120-volt room air conditioner is typically 10 feet. This limitation is in place primarily for safety reasons. The National Electrical Code (NEC) establishes this guideline to minimize the risk of electrical hazards, such as overheating or damage to the cord from being too long. A longer cord can increase resistance and the potential for voltage drop, which can affect the performance of the air conditioner and lead to overheating. Additionally, ensuring the cord length remains within specified limits helps prevent tripping hazards and keeps the installation neat and manageable.

Shorter cord lengths, such as 4, 6, or 8 feet, may also be mentioned in various contexts, but they do not meet the requirement for maximum cord length as specified for standard air conditioning unit installations. The 10-foot limit is thus the most practical and safe choice for this application.