Electrical Questions? Ask an Electrician Online.
Hi, I'm Mike G and I'll be assisting you. You need to look for a disconnect. It will either be another panel, a small breaker box or a fused manual switch.
Look at the wiring leaving the main panel. Follow the larger cables to get to an area where you'll find the breaker box.
Keep looking around, there has to be one. It should be accessable. It will be somewhere between the main panel and the dryer. There isn't anything more I can suggest. Good luck.