Microwave needs to have its own dedicated circuit. Is this a microwave hood or two separate appliances?

Lighting circuits are dedicated circuits also. They cannot be fed of of a countertop or any other outlet circuit. A MW needs a dedicated circuit, as does a fridge.

So.. they wired it wrong then?

They are separate appliances... microwave is in the pantry on the circuit marked microwave.. went to cook today (breaker still flipped for work im doing) and the hood doesn't work.. no lights.. no fan.

Yeah, each appliances should be on it's own circuit so as not to overpower system.

So what do I do now? This build was a nightmare... they tried to wire a cooktop and double oven together on a single 50A circuit.. had 2 bathrooms with no outlets in them .. it's been a battle. When are folks held accountable?

https://mrelectric.com/dedicated-circuits

My house is 25 years old, and it was wired with no dedicated circuit for a microwave. We just put one in ourselves this winter. No more popping the circuit with the toaster oven and microwave together.

There's nothing obligatory in the code to put these appliances on a dedicated circuit unless the manufacturer says it's required. It might be a good idea depending ont he unit. Mr. Electric's webpage is not accurate in the least. Almost every statement on that page is incorrect.

First off, who has a hair dryer in the kitchen. Who puts a toaster on a dedicated circuit?
Who puts dryers in kitchns? "Double Pole" has nothing to do with "preventing a circuit from drawing too much power," it's because the appliance needs 240V.

I have no idea what the second bullet item is supposed to mean but it makes little sense. The circuit breaker is supposed to be sized for the ampacity of the wire and devices on the circuit. If you get that right, there's not going to be any overheating and fire. Get it wrong and it matters not if it is a shared or dedicated circuit.

The comment about fixed appliances is nonsense. The code says nothing of the sort.

The important takeaway from the outage here is that the lights shouldn’t be on the same circuit as the MW. Lighting should be on a lighting circuit, with no outlets on it. ”Best practice”, especially in new construction, says that a MW should have a dedicated circuit. That may or may not be a local code. But mixing lighting with a MW isn’t code anywhere.

"Who puts a toaster on a dedicated circuit?"

Yeah I read that and I went..."huh??". I will concede that a toaster can hog amps though. And with a MW on the same 20 amp circuit, using them together will trip the breaker.

Lights can NOT be on the small appliance circuits whether the circuit is dedicated to the microwave or not. That's not been permitted in the code for decades.

Again, if your municipality follows the NEC, there's no requirement for a dedicated circuit for any cord and plug connected appliance unless the manufacturer's instructions require it. Now you may CHOOSE to have an additional circuit (still has to meet the Small Appliance circuits except for two exceptions), but it's not required by the NEC.

And, IIRC, the range hood does not require a dedicated circuit.

If it is cord and plug connected, it has to go on a small appliance (20A) circuit though probably not a dedicated one (unless the manufacturer says it must).

If it is hard-wired, it can't go on a small appliance circuit, but still doesn't need to be a dedicated circuit unless the manufacturer says it must.