Advances in cable and conduit sealing for Class 1 hazardous locations

Ballard, Andrew; Alexander, R.B.

doi:10.1109/pcicon.1996.564872

Cited by 1 publication

(5 citation statements)

References 1 publication

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“…Installing equipment in an electrically classified area offers three wiring choices: Placing all ignition sources (arcing and sparking devices) inside an explosion-proof enclosure, providing appropriate seals, , and wiring it with conduit or approved cables (hereafter referred to as explosion-proof). Wiring the system as intrinsically safe, , typically by providing an approved barrier on each device, so that the total possible energy in the system, even in a fault state, is insufficient to ignite a gas or vapor. Determining that the system is inherently too low in energy to ignite a gas or vapor and that it can be wired as nonincendive …”

Section: Allowable Wiring Methodsmentioning

confidence: 99%

“…• Placing all ignition sources (arcing and sparking devices) inside an explosion-proof enclosure, l providing appropriate seals, 23,m and wiring it with conduit or approved cables (hereafter referred to as explosion-proof). • Wiring the system as intrinsically safe, 24,n typically by providing an approved barrier on each device, so that the total possible energy in the system, even in a fault state, is insufficient to ignite a gas or vapor.…”

Section: ■ Allowable Wiring Methodsmentioning

confidence: 99%

“…Placing all ignition sources (arcing and sparking devices) inside an explosion-proof enclosure, providing appropriate seals, , and wiring it with conduit or approved cables (hereafter referred to as explosion-proof).…”

Section: Allowable Wiring Methodsmentioning

confidence: 99%

“…See also NFPA 70 National Electric Code Article 501.15, Babiarz et al 25 and Ballard and Alexander. 26 n NFPA 70 National Electric Code Article 504. See also PEPPERL+FUCHS 27 and Cooper Crouse-Hinds.…”

Section: ■ Summarymentioning

confidence: 99%

“… m Intended to keep any ignition inside the enclosure from spreading through the wiring system and retaining the force of any explosion within the enclosure. See also NFPA 70 National Electric Code Article 501.15, Babiarz et al and Ballard and Alexander …”

mentioning

confidence: 99%

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Primer on Area Electrical Classification for Research Laboratories

Palluzi

2023

ACS Chem. Health Saf.

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Numerous published and anecdotal accounts exist on flammable liquids and gases igniting in chemical laboratories. This hazard could be mitigated by a better understanding of the principles behind electrical classification, which determines the type of electrical equipment that can be safely used in the presence of flammable materials. Laboratories can successfully apply electrical classification to reduce the risk of fires and explosions, but its proper application requires experience in research operations, the principles and practices of area electrical classification, proper hazard analysis and risk assessment, and some understanding of the methods available for compliance. This article provides a primer for laboratory personnel to assist them in determining if electrical classification of their operations and equipment may be warranted.

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