n1163 said:hello, does anyone know if three piece couplings are legal to use in a class 1 div 1 area? the one's in question are cast iron and the manufacturer is unknown.
Don,don_resqcapt19 said:In this area a "3 piece coupling" is the item that is also known as an Erickson. This product is not suitable for use in a Class I, Division 1 area. You need an explosionproof union for that application.
Don