Canadian Agricultural Products. To check for restrictions on fruits and vegetables from Canada, you can search the FAVIR database at www.aphis.usda.gov/favir/. Click the âFresh Fruit and Vegetablesâ link to the right to learn how to use the database.
The standard voltage for the telephone system is 48 volts DC. Ringing voltage is much higher, around 90 volts AC at a low frequency. When you place a load of about 600 ohms on the line, you are off hook or connected. Telephone ringer voltage is 50.5 volts at standing and -50.5 volts at ringing.
dc voltage dangerous <=60V used for wired phone supply give irritation to most. <=110V US, shock but mostly not lethal. 220-240V Europe, on the avarage lethal for about a minute. During the first world war there was a decision to use 220V instead of 110V because then wiring could be a quarter thick. That helps to supply more copper to the battlefield during the first world war.