This standard is used with the intent to protect the wearer against the spatter (small splashes of molten metal), short-term electrical shock, accidental contact with live electrical conductors at voltages, and minimizes the possibility of short-term electrical shock and accidental contact with live electrical conductors at voltages.
Class 1 is against less hazardous welding techniques and situations, causing lower levels of spatter and radiant heat.
Class 2 is against more hazardous welding techniques and situations, causing higher levels of spatter and radiant heat.