Yes, 4 wires. There are 4 'prongs'. A 4-wire 220v line is used for appliances such as stoves and clothes dryers. A 4-wire line usually has 2 insulated power wires (red and black), one neutral wire (white) and a green or bare ground wire. This adapter just plugs into that 4-wire plug, and basically uses half the circuit to give 110V to your gas stove for the igniter and electronics.
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This adapter converts the 240 down to a single 120 VAC Outlet protected by non-replaceable 15 Amp fuse. So you should measure 120 V.
Yes, that's exactly what it's for, and what I used mine for when I switched to a gas stove.
Its rated for 15 amps(built-in fuse) so that should not be a problem.
Its simple. This adapter just plugs into the 220 outlet and provides a standard 120 outlet to plug your appliance into. So its just the cost of the adapter.
Please consult with your local electrician.
it is UL certified in the US now so it should work with codes. NOTE this has a 240 14-50R connector (straight prongs) and will not fir the 14-30r the 4 prongs with the L
It has a built-in 15 Amp fuse, so that shouldn't be a problem.