Fuse vs earth wire. Which is more effective? Watch

iWoof
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Which is more effective when it comes to electricity and safety?

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iWoof
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Anyone?

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iWoof
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Bump

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uberteknik
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(Original post by iWoof)
Which is more effective when it comes to electricity and safety?

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This is a serious but open ended question because neither system is either/or. Both are implemented together or in conjunction with other safety systems.

The problem is defining effective in the context of safety. No system is 100% safe. Rather than defining safe it may be best to start with a definition of unsafe: the probability of a situation or fault occurrence leading to a condition which may cause injury or death. It then comes down to the type of situation needing to be mitigated.

Fuse wires protect against faults in equipment or situations which may lead to a fire. Such a failure could endanger many lives, say for instance in a domestic house trapping a family in an upstairs room. i.e. protects against fire and smoke. Death may be slow and unnoticed (smoke inhalation at night) and could affect many people. Fuse wires will not always protect against electrocution in which as little as 50mA @ 50V d.c. is enough to kill by causing heart seizure for instance, but still not enough to cause the fuse wire to rupture.

Earth wires protect users from potentially lethal voltages appearing at unexpected and accessible places such as within bathrooms, kitchens, or the outer casing of electrical equipment etc. i.e. protects against electrocution. Death can be very quick/instantaneous but probably limited to the person inadvertently touching the faulty equipment. However, on its own, an earth wire may still cause overheating through large current flows (kW of power from the mains) and lead to a fire because the power source is still present.

Used together, an earth system is designed to divert lethal currents away from people through a path of least resistance to ground (earth) potential. The low resistance earth wire path will sink high current from the supply via the fuse wire which will then blow and cut off the power supply to prevent the spread of fire and creation of smoke.

The fuse wire and earth wire are designed to protect against different faults and hence outcomes. The question is open ended because it
cannot be answered without some kind of quantitative risk assessment which itself is often interpreted subjectively.

Footnote: A far better method of protection are the Residual Current Circuit Breaker (RCCB) and Earth Leakage Circuit Breaker (ELCB).

http://www.bbc.co.uk/schools/gcsebit...elecrev4.shtml
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iWoof
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(Original post by uberteknik)
This is a serious but open ended question because neither system is either/or. Both are implemented together or in conjunction with other safety systems.

The problem is defining effective in the context of safety. No system is 100% safe. Rather than defining safe it may be best to start with a definition of unsafe: the probability of a situation or fault occurrence leading to a condition which may cause injury or death. It then comes down to the type of situation needing to be mitigated.

Fuse wires protect against faults in equipment or situations which may lead to a fire. Such a failure could endanger many lives, say for instance in a domestic house trapping a family in an upstairs room. i.e. protects against fire and smoke. Death may be slow and unnoticed (smoke inhalation at night) and could affect many people. Fuse wires will not always protect against electrocution in which as little as 50mA @ 50V d.c. is enough to kill by causing heart seizure for instance, but still not enough to cause the fuse wire to rupture.

Earth wires protect users from potentially lethal voltages appearing at unexpected and accessible places such as within bathrooms, kitchens, or the outer casing of electrical equipment etc. i.e. protects against electrocution. Death can be very quick/instantaneous but probably limited to the person inadvertently touching the faulty equipment. However, on its own, an earth wire may still cause overheating through large current flows (kW of power from the mains) and lead to a fire because the power source is still present.

Used together, an earth system is designed to divert lethal currents away from people through a path of least resistance to ground (earth) potential. The low resistance earth wire path will sink high current from the supply via the fuse wire which will then blow and cut off the power supply to prevent the spread of fire and creation of smoke.

The fuse wire and earth wire are designed to protect against different faults and hence outcomes. The question is open ended because it
cannot be answered without some kind of quantitative risk assessment which itself is often interpreted subjectively.

Footnote: A far better method of protection are the Residual Current Circuit Breaker (RCCB) and Earth Leakage Circuit Breaker (ELCB).

http://www.bbc.co.uk/schools/gcsebit...elecrev4.shtml
Very well explained, thank you so much

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