Which type of cables are permitted close to the electrode holder?

The correct choice is the type of cable that is rubber covered and free from splices. This is pertinent in Shielded Metal Arc Welding (SMAW) practices because using rubber insulated cables ensures that the electrical connections are safe and protected from damage, which could lead to electrical hazards. Rubber is an effective insulator, providing a layer of safety against electrical shock for the welder, especially when working in environments where moisture or other conductive materials may be present.

Additionally, the requirement for cables to be free from splices is crucial. Splices can potentially create points of electrical failure, increase resistance, or even become sources of heat and sparks, which can be dangerous in a welding environment. Thus, ensuring that the cables are intact and properly insulated minimizes risks and maintains safe working conditions.

In contrast, the other types of cables mentioned do not adhere to the safety standards required for proximity to the electrode holder. Metal cables, for instance, lack insulation and can conduct electricity freely, posing a serious risk of shock or short circuiting. Plastic cables, while they can act as insulators, may not be rated for the high temperature and specific electrical conditions present in welding applications. Therefore, rubber covered cables free from splices are the most suitable and safe choice