240 Volt portable radiator, no indeterminate terminal on womanly conclude receptacle - any problems? 8/3 wire run from Panel to outlet box, womanly end plug have...

8/3 wire run from Panel to outlet box, womanly end plug have 3 terminals, 1-hot (Black), 2-hot (Red), 3-ground(Green). But I own a white neutral unused in the box beside no terminal. Is it safe to tuck it into the box and plug my stove in?
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Answers:    yes.
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Yes, this should be only just fine. All newer 240V appliances now require a indeterminate wire, but unless they own an electronic board in them, they won't know the difference. If your's have a 3-prong plug, just plug it within.