Customer had a tripped art fall breaker and side panel and explain how to test and reset breaker. The original issue was that the nursery room was not working and had no power from plugs or switches. Explain to customer that the breaker trip for a reason, reset breaker and everything worked other than closet light. And realized that the breaker tripped every time you cut the light on. Took down light fixture and opened up switch and saw that there was a ground wire, touching a hot wire on the switch, causing the breaker to trip. Repaired switch and light fixture and everything worked with no issues. Explain to customer that she had two majorly oversized circuit breakers in the electrical panel with the wrong type breaker made from home line. Explain it is a BR panel and that a 30 amp breaker should not be on a 14 gauge wire.