Telephone Set Protection

 

Переведите

telephone set______________________________________

protector unit______________________________________

carbon protector block_______________________________

ground network____________________________________

 

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1. Fuses__________________________________________

— serve as protectors.

— protect the protector blocks.

— are not used with insulated wires.

2. Power contact current may overheat either the protector or its ground part

3. A protector unit_________________________________

— is an important part of the system.

— serves as protection element.

4. No charges move through an open circuit.

5. No fuse is used in case of the building being served by insulated wires.

 

Прочитайте и переведите вопросы, найдите ответы в тексте

• Why do telephone sets need protection?

• Why is a fuse an important part of a protector block?

• What parts does a protector unit consist of?

• What units serve as protection devices?

• What current may overheat the protector?

 

 

Transmitting lines that serve telephone sets may have contacts with pow­er lines or with lightning. Therefore telephone sets and their lines need pro­tection. Protector units connected to the transmitting lines serve as protec­tion devices.

Usually a protector unit consists of carbon protector blocks connected between each wire of the line and the ground. Fuses are also the widely used elements of the protector blocks; they protect protector blocks against power contact currents.

It should be noted that a fuse is an important part of protector blocks; without it power contact currents may overheat the protector or its ground conductor. But sometimes fuses are not used. No fuse is used in case the building is served by insulating wires that are connected to metal – sheathed cables on the line pole.