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However, the fact that the cable rating is 67% that of the circuit breaker, not 50%, means that a ring has to be significantly out of balance to cause a problem. In a ring circuit, if any poor joint causes a high resistance on one branch of the ring, current will be unevenly distributed, possibly overloading the remaining conductor of the ring.
A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook. In terminology devised by phone phreaks, a ringing generator is a magenta box.
Ring circuits are a way of installing a circuit using a cable size smaller than an equivelent radial circuit could safely manage as the loadings on the cables are reduced by 50%. These are common in the UK, and a small number of other countries.
These were single-stroke bells: applying current to an electromagnet pulled the bell's clapper against the bell or gong and gave one chime. The bell did not ring continuously, but only with a single ring, until current was applied again. To sustain the tone, these bells were usually much larger than are used today with interrupter bells.
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Western Electric hand telephone set of c. 1930 with its ringer box or subscriber set in the background.. A ringer box is a telephone signaling device, similar to a bell box.It usually contains an electromechanical gong and was used with most early desk stand telephones, such as candlestick telephones and the Western Electric type Western Electric hand telephone sets, which were too small to ...
The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message. [45] The "Ring Chime" accessory is a unit plugged into a power outlet to play the doorbell's chime. The "Chime Pro" is an extended version that also doubles as a wireless repeater for Wi-Fi networks. [46]
A Simplex-brand fire alarm bell. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.