What are you running with your dryer?
The kettle in the kitchen normally trips it but our floor vac does as well as the microwave.. I also trip it when I run the microwave and the kettle at the same time..
Do you have safty switches?
Yes at the main box is one of those Special cutout switches but that is not tripping the regular breaker is
How old is the house?
25+ Years?
Does the dryer run ok alone?
Yes all by itself fine
Is their any moisture in the laundry or is it raining?
Some moisture but not heaps and we normally open the laundry door to the outside so minimal moisture if any at all..