This question is best answered by addressing several points;
A. Wireless communication is the safest alternative. Wherever possible, one should opt to using wireless headset under their arc flash hood. The communications device would be completely covered by the hood and would not interfere with the performance of the hood. However, working conditions may make it difficult to use wireless communications. Strong electromagnetic field could interfere with communication sine waves; as communications sine waves could hinder the operation of control devices.