The limit for using a Bank of Communications credit card without accruing interest is called the free limit. According to relevant query information, the free limit of Bank of Communications credit card refers to the interest-free period limit of the credit card. Within a period of time (usually 20-50 days) starting from the credit card statement date, the cardholder can use the credit card's limit without incurring interest. This part of the limit is called the free limit. The size of the free limit depends on factors such as the bank's policy and the cardholder's credit rating.