Design of electrical appliances
If appliances that use mains electricity should develop a fault the
consequences to the user can be lethal.
In the design of electrical appliances
steps are taken to prevent this.
It is always possible for appliances to...
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Design of electrical appliances
If appliances that use mains electricity should develop a fault the
consequences to the user can be lethal.
In the design of electrical appliances
steps are taken to prevent this.
It is always possible for appliances to
become faulty.
However, the design precautions taken are such that a single
fault will not result in any danger to the user.
On appliances that have large areas of exposed metal, say a PC or an
electric fire, this metal is connected to the Earth pin of the mains plug.
The
idea is that if high voltages should develop within the PC due to a single
fault, this cannot reach the user, as the whole unit is enclosed in a "safe"
earthed case.
This type of protections is known as Class I.
The other way of providing protection is by the use of two separate layers of
Insulating Oil Testers.
If a single fault resulted in the first layer of
insulation being breached, then the second layer of protection is still
available.
This method is used
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