Why are synthetic materials like polyester and spandex not suitable for electrical work?

Synthetic materials such as polyester and spandex are not suitable for electrical work primarily because they have a low melting point. When exposed to high temperatures, such as those that could be encountered during electrical faults or arc flash events, these materials can melt. If they melt, they can adhere to the skin and cause serious burns. This characteristic poses a significant hazard in environments where electrical work is performed, where the risk of extreme heat or fire exists.

Understanding the risks associated with fabric materials is crucial for safety in electrical work. While other options like weight and cost may also be concerns in different contexts, the immediate danger of melting and potential burns makes polyester and spandex particularly unsuitable for use by linemen and electrical workers.