500-7 lists explosive gas monitors in lieu of explosionproof wiring methods but doesnt really specify what the monitors must do...I have some ITrans fixed point monitors and audible/visual signalling devices. does this satisfy the the requirements? there are also a pair of fault contacts in the monitor to indicate a fault in the system....is this option also required to be configured into the system? any guidance would be appreciated
500-7
- Thread starter badjeepr
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- Illinois
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- retired electrician
Have looked at the references listed in the FPNs? I don't have copies of them, but I expect you will find your answers there.
Don
Don
LarryFine
Master Electrician Electric Contractor Richmond VA
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- Henrico County, VA
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Have patience, young Jedi. Not everyone here has time to read and respond to the forum more than once a day, if even that often. You should allow at least 24 hours to bump a question. Plus, this is a voluntary "service" and we don't get paid to be here.badjeepr said:
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Don's point is well taken. There are very limited applications for gas detection and they are listed in 500.7(K)(1),(2) and (3). The FPNs each relate to one of those applications.
Here is the applicable code on subject:
(K) Combustible Gas Detection System. A combustible gas detection system shall be permitted as a means of protection in industrial establishments with restricted public access and where the conditions of maintenance and supervision ensure that only qualified persons service the installation. Gas detection equipment shall be listed for detection of the specific gas or vapor to be encountered. Where such a system is installed, equipment specified in 500.7(K)(1), (K)(2), or (K)(3) shall be permitted.
The type of detection equipment, its listing, installation location(s), alarm and shutdown criteria, and calibration frequency shall be documented when combustible gas detectors are used as a protection technique.
FPN No. 1: For further information, see ANSI/ISA-12.13.01, Performance Requirements, Combustible Gas Detectors.
FPN No. 2: For further information, see ANSI/API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division I or Division 2.
FPN No. 3: For further information, see ISA-RP12.13.02, Installation, Operation, and Maintenance of Combustible Gas Detection Instruments.
(1) Inadequate Ventilation. In a Class I, Division 1 location that is so classified due to inadequate ventilation, electrical equipment suitable for Class I, Division 2 locations shall be permitted.
(2) Interior of a Building. In a building located in, or with an opening into, a Class I, Division 2 location where the interior does not contain a source of flammable gas or vapor, electrical equipment for unclassified locations shall be permitted.
(3) Interior of a Control Panel. In the interior of a control panel containing instrumentation utilizing or measuring flammable liquids, gases, or vapors, electrical equipment suitable for Class I, Division 2 locations shall be permitted.
(L) Other Protection Techniques. Other protection techniques used in equipment identified for use in hazardous (classified) locations.
It has only 3 areas of use listed. If any of the 3 apply you are good to go. As far as 2nd part of question, I would hope if you refer to info referred to in FPNs, you would get your answer.
(K) Combustible Gas Detection System. A combustible gas detection system shall be permitted as a means of protection in industrial establishments with restricted public access and where the conditions of maintenance and supervision ensure that only qualified persons service the installation. Gas detection equipment shall be listed for detection of the specific gas or vapor to be encountered. Where such a system is installed, equipment specified in 500.7(K)(1), (K)(2), or (K)(3) shall be permitted.
The type of detection equipment, its listing, installation location(s), alarm and shutdown criteria, and calibration frequency shall be documented when combustible gas detectors are used as a protection technique.
FPN No. 1: For further information, see ANSI/ISA-12.13.01, Performance Requirements, Combustible Gas Detectors.
FPN No. 2: For further information, see ANSI/API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division I or Division 2.
FPN No. 3: For further information, see ISA-RP12.13.02, Installation, Operation, and Maintenance of Combustible Gas Detection Instruments.
(1) Inadequate Ventilation. In a Class I, Division 1 location that is so classified due to inadequate ventilation, electrical equipment suitable for Class I, Division 2 locations shall be permitted.
(2) Interior of a Building. In a building located in, or with an opening into, a Class I, Division 2 location where the interior does not contain a source of flammable gas or vapor, electrical equipment for unclassified locations shall be permitted.
(3) Interior of a Control Panel. In the interior of a control panel containing instrumentation utilizing or measuring flammable liquids, gases, or vapors, electrical equipment suitable for Class I, Division 2 locations shall be permitted.
(L) Other Protection Techniques. Other protection techniques used in equipment identified for use in hazardous (classified) locations.
It has only 3 areas of use listed. If any of the 3 apply you are good to go. As far as 2nd part of question, I would hope if you refer to info referred to in FPNs, you would get your answer.
- Location
- Illinois
- Occupation
- retired electrician
yes i believe the installation falls into the use of detectors but the customers intent is to only use them for audio/visual signalling with no intent of the detectors de-energizing circuitry within area... it just doesnt seem safe! regardless im looking for the requirements of the detectors ie: is audio/visual signalling accpetable?
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