What Is a Safe Load Indicator and Why Is It Required?
A Safe Load Indicator (SLI), also referred to as an automatic safe load indicator or load moment indicator (LMI), is a critical safety device used in lifting operations to prevent crane overloading. In the context of tower cranes and mobile lifting appliances, it serves as the operator’s real-time alert system, providing accurate data on the load being lifted and how it relates to the crane’s safe operating limits. In Hong Kong, the installation and proper use of SLIs is not merely a best practice—it is a legal requirement under the *Factories and Industrial Undertakings (Lifting Appliances and Lifting Gear) Regulations (Cap. 59J)*.