Unlikely to be recent, the industry has been using impregnating varnishes for 30+ years, rather than wax. However, that does not mean that the wax itself is necessarily bad!
Wax is flammable, and if the transformer is old enough to be a wax jobbie, the wire enamel could be questionable. I have known old transformers break down due to shorted turns, get hot and start smoking. Never seen if they catch fire, I've always caught them before that happened! (Twice).
Wax is flammable, and if the transformer is old enough to be a wax jobbie, the wire enamel could be questionable. I have known old transformers break down due to shorted turns, get hot and start smoking. Never seen if they catch fire, I've always caught them before that happened! (Twice).
