Today I tried to change an old broken pull cord light switch in an old building. The old switch was jammed and would not close. I replaced the switch (one way), put in a new light bulb but it didn't work. When I checked the voltage at the light I discovered there was only 110V there instead of 220V. As I said its an old building. What I also found strange was I had about 30V across the "supposed" live wire and switch wire at the pull cord switch. Any help would be greatly appreciated! Thanks.