Hide fields based on drop down selection with “or” statement

I am creating an asset inventory sheet for high voltage electrical equipment, on this sheet I have a drop down for the asset type. I also have fields for the specifications of the equipment. I am wanting to hide the spec fields that do not apply to the asset type when it is selected. My problem is there are certain specs that apply to multiple asset types so I would need some type of  "or" statement but I can not figure out how it should be shown in the formula. 
Here is what I have right now:

if(this.getField("Select Asset Classification").value=="Breaker"){event.target.display=display.visible}else{event.target.display=display.hidden}

I tried .value=="Breaker"||"Transformer" but that did not work. Does anyone have any suggestions? Thank you in advance.