Intrinsically Safe Systems
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luke warmwater
Senior Member
Re: Intrinsically Safe Systems
Article 504
Basically, it means 'truly' safe.
Article 504
Basically, it means 'truly' safe.
Re: Intrinsically Safe Systems
The definition of a intrinsically safe circuit by the American Petroleum Institute is.
Intrinsically Safe Circuit: A circuit in which sparks or thermal effect is incapable of causing ignition of mixtures of flammable or combustible materials in air under test conditions prescribed by ANSI/UL 913.
In most cases it is a circuit that has an approved safety barrier that limits the amount of current going to the equipment to a level than will not cause a spark that is hot enough to set off a combustible atmosphere/material. The equipment supplied by the barrier also has to be rated for use in an intrinsically safe circuit. This is so you don?t have equipment that has a capacitance or reactance large enough to store up the supplied current then discharge it at a level that would set off the combustible atmosphere/material. The barriers and equipment have to be approved for the type of area classification they are going to be used in.
The definition of a intrinsically safe circuit by the American Petroleum Institute is.
Intrinsically Safe Circuit: A circuit in which sparks or thermal effect is incapable of causing ignition of mixtures of flammable or combustible materials in air under test conditions prescribed by ANSI/UL 913.
In most cases it is a circuit that has an approved safety barrier that limits the amount of current going to the equipment to a level than will not cause a spark that is hot enough to set off a combustible atmosphere/material. The equipment supplied by the barrier also has to be rated for use in an intrinsically safe circuit. This is so you don?t have equipment that has a capacitance or reactance large enough to store up the supplied current then discharge it at a level that would set off the combustible atmosphere/material. The barriers and equipment have to be approved for the type of area classification they are going to be used in.
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- Lockport, IL
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- Semi-Retired Electrical Engineer
Re: Intrinsically Safe Systems
The dictionary I keep at my desk defines ?Intrinsic? as ?Belonging to a thing by its very nature.? In the context of interest here, ?Intrinsically safe? would mean that the voltage level at which the system operates and the energy that it might release in the event of a short circuit are not high enough to cause a fire.
The dictionary I keep at my desk defines ?Intrinsic? as ?Belonging to a thing by its very nature.? In the context of interest here, ?Intrinsically safe? would mean that the voltage level at which the system operates and the energy that it might release in the event of a short circuit are not high enough to cause a fire.
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