Thermal stress cracking isn't different for insulated glazing and uninsulated glazing. Steel doors are available in uninsulated, insulated, and double skin steel. Unheated and uninsulated freight cars were used. This contrasts with the traditional practice of using uninsulated conductors separated by air gaps. An analogy for this is having two uninsulated electrical wires placed adjacent to each other. An uninsulated drain wire is contained inside the screen to facilitate ground connection. On land cables could be run uninsulated suspended from poles. Uninsulated PVT collectors are beneficial for operation near and below ambient temperatures. For this reason, the tanks often stopped short of the hotter and uninsulated smokebox. When quenched, the uninsulated edge contracts, causing the sword to first bend towards the edge. In some situations this could leave areas of wall uninsulated.