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.
In the 5-wire system, there are 3 hot wires, 1 neutral wire, and 1 grounding wire. The common 3-wire receptacle uses only one of the 3 hot wires. In North America, minicomputers frequently are designed to use a 208V 3-wire system. In this 3-wire system there are 2 hot wires and 1 ground wire (no neutral wire). In this case the two hot wires are the power carrying wires. In Europe, the normal 3-wire receptacle is symmetrical so that the neutral and hot wire connections can be swapped by simply rotating the plug.