My Wolf came with a metallic flex cable (technically a conduit) containing conductors to hard wire into a box. Examination of the conductors showed that they would be undersized if they were typical conductors rated for the oven current; instead they use high temperature insulation on smaller diameter wire. This saves a minute amount of copper. My guess is that because plugs (that I can find, anyway) are not rated for that wire temperature (vaguely recall 105C), hard wiring is necessary. (I seem to recall somewhere that wire nuts are rated to higher temperature, among other connection methods.) Wire nuts for AWG 6 (or in your case AWG 8) may be awkward to use in a box, so another option is a screw retention insulated union device such as the Greaves Corp. PBS2.

kas

All wall ovens are hardwired.

kaseki
thanks for the info, looks I'll need to find out what Electrolux sends out. The installation manual has limited info on that matter.
Was your Wolf a double wall oven? If so how did you "mount" a jbox?