Final answer:
Manual electrode holders must safely handle the rated current, be designed for arc welding and cutting, be fully insulated against maximum voltage to ground, and only approved holders should be used.
Step-by-step explanation:
The requirement for manual electrode holders in the context of arc welding and cutting is multifaceted. These electrode holders must be capable of safely handling the maximum rated current that they are intended for. Additionally, they need to be specifically designed for use in arc welding and cutting processes to ensure safety and functionality. Another important requirement is that the holders be fully insulated against the maximum voltage to ground to prevent accidental electrocution or short circuits. Lastly, it's also imperative that only approved manual electrode holders are utilized to maintain safety standards and ensure the integrity of the welding equipment.