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[DOPEinDOPAMINE]

List the main differences between an AX. and a DC. switchboard ?

 

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An AX (air circuit breaker) switchboard and a DC (direct current) switchboard differ in several aspects. Here are the main differences:

1. Function: An AX switchboard is used for AC (alternating current) electrical systems while a DC switchboard is used for DC electrical systems.

2. Voltage: An AX switchboard can handle voltage up to 600V while a DC switchboard can handle voltage up to 1500V.

3. Arc Interruption: AX switchboards use air circuit breakers which can interrupt an arc fault while DC switchboards use magnetic or hydraulic breakers which cannot interrupt an arc fault.

4. Components: AX switchboards may have components such as relays, transformers, and power monitoring devices for AC systems while DC switchboards may have components such as rectifiers, batteries, and inverters for DC systems.

5. Safety: AX switchboards may have safety features such as earth fault protection and short circuit protection while DC switchboards may have safety features such as reverse current protection and overcurrent protection.

In summary, the main differences between an AX switchboard and a DC switchboard are their function, voltage capacity, arc interruption capabilities, components used, and safety features.

 

[DOPEinDOPAMINE]

What are the four fault ratings of a circuit breaker?

 

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The four fault ratings of a circuit breaker are:

1. Interrupting Rating: This is the maximum fault current that the circuit breaker can interrupt safely without causing damage to itself or the connected equipment.

2. Short-Time Rating: This is the maximum fault current that the circuit breaker can safely interrupt for a specific duration of time, usually ranging from 3 to 30 seconds.

3. Continuous Current Rating: This is the maximum current that the circuit breaker can handle on a continuous basis without overheating.

4. Momentary Rating: This is the maximum fault current that the circuit breaker can safely interrupt for a very short duration, usually less than one second.