Full scale fire experiments on electronic cabinets

Johan Mangs, Olavi Keski-Rahkonen

Research output: Book/ReportReportProfessional

Abstract

Three full scale fire experiments on electronic cabinets have been carried out. In the experiments one cabinet, the fire cabinet, was fitted with cables, circuit boards, circuit board rails and connectors and wiring behind the connectors. A mock-up cabinet made of thin steel sheets was attached to the fire cabinet in order to study the response of an adjoining cabinet to the fire. Another cabinet was placed at a distance of 1 m opposite the fire cabinet to represent a neighbouring row of cabinets. The fire cabinet was ignited with a small propane burner located at the bottom of the cabinet. Rate of heat release by means of oxygen consumption calorimetry, mass change, CO2, CO and smoke production rate, concentration of O2, CO2 and CO in the fire cabinet, gas flow velocity in the fire cabinet and gas and wall temperatures in all three cabinets were measured as a function of time. A rough estimate for the power and energy needed for cable bundle ignition was obtained. Similarly, fire growth rate after ignition was determined as well as time needed for ignition in the adjoining cabinet. A simple buoyant vent flow model is presented which serves to explain observed burning rates after flashover. The burning in the cabinet was found to be oxygen limited with incomplete mixing. A calculation formula for the rate of heat release after flashover in the cabinets is proposed.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages100
ISBN (Print)951-38-4624-5
Publication statusPublished - 1994
MoE publication typeNot Eligible

Publication series

NameVTT Publications
PublisherVTT
No.186
ISSN (Print)1235-0621
ISSN (Electronic)1455-0849

Fingerprint

Fires
Experiments
Ignition
Flashover
Printed circuit boards
Cables
Oxygen
Networks (circuits)
Vents
Calorimetry
Electric wiring
Steel sheet
Fuel burners
Smoke
Propane
Flow velocity
Flow of gases
Rails
Gases

Keywords

  • fire safety
  • fire tests
  • electric devices
  • cabinets
  • circuits
  • electric appliances
  • electric utilities
  • electric connectors
  • cables (ropes)
  • ignition
  • propane
  • burners
  • temperature
  • thermal radiation
  • rates (per time)
  • oxygen consumption
  • smoke
  • gas flow
  • carbon dioxide
  • carbon monoxide

Cite this

Mangs, J., & Keski-Rahkonen, O. (1994). Full scale fire experiments on electronic cabinets. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 186
Mangs, Johan ; Keski-Rahkonen, Olavi. / Full scale fire experiments on electronic cabinets. Espoo : VTT Technical Research Centre of Finland, 1994. 100 p. (VTT Publications; No. 186).
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Mangs, J & Keski-Rahkonen, O 1994, Full scale fire experiments on electronic cabinets. VTT Publications, no. 186, VTT Technical Research Centre of Finland, Espoo.

Full scale fire experiments on electronic cabinets. / Mangs, Johan; Keski-Rahkonen, Olavi.

Espoo : VTT Technical Research Centre of Finland, 1994. 100 p. (VTT Publications; No. 186).

Research output: Book/ReportReportProfessional

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N2 - Three full scale fire experiments on electronic cabinets have been carried out. In the experiments one cabinet, the fire cabinet, was fitted with cables, circuit boards, circuit board rails and connectors and wiring behind the connectors. A mock-up cabinet made of thin steel sheets was attached to the fire cabinet in order to study the response of an adjoining cabinet to the fire. Another cabinet was placed at a distance of 1 m opposite the fire cabinet to represent a neighbouring row of cabinets. The fire cabinet was ignited with a small propane burner located at the bottom of the cabinet. Rate of heat release by means of oxygen consumption calorimetry, mass change, CO2, CO and smoke production rate, concentration of O2, CO2 and CO in the fire cabinet, gas flow velocity in the fire cabinet and gas and wall temperatures in all three cabinets were measured as a function of time. A rough estimate for the power and energy needed for cable bundle ignition was obtained. Similarly, fire growth rate after ignition was determined as well as time needed for ignition in the adjoining cabinet. A simple buoyant vent flow model is presented which serves to explain observed burning rates after flashover. The burning in the cabinet was found to be oxygen limited with incomplete mixing. A calculation formula for the rate of heat release after flashover in the cabinets is proposed.

AB - Three full scale fire experiments on electronic cabinets have been carried out. In the experiments one cabinet, the fire cabinet, was fitted with cables, circuit boards, circuit board rails and connectors and wiring behind the connectors. A mock-up cabinet made of thin steel sheets was attached to the fire cabinet in order to study the response of an adjoining cabinet to the fire. Another cabinet was placed at a distance of 1 m opposite the fire cabinet to represent a neighbouring row of cabinets. The fire cabinet was ignited with a small propane burner located at the bottom of the cabinet. Rate of heat release by means of oxygen consumption calorimetry, mass change, CO2, CO and smoke production rate, concentration of O2, CO2 and CO in the fire cabinet, gas flow velocity in the fire cabinet and gas and wall temperatures in all three cabinets were measured as a function of time. A rough estimate for the power and energy needed for cable bundle ignition was obtained. Similarly, fire growth rate after ignition was determined as well as time needed for ignition in the adjoining cabinet. A simple buoyant vent flow model is presented which serves to explain observed burning rates after flashover. The burning in the cabinet was found to be oxygen limited with incomplete mixing. A calculation formula for the rate of heat release after flashover in the cabinets is proposed.

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KW - burners

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KW - thermal radiation

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KW - gas flow

KW - carbon dioxide

KW - carbon monoxide

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Mangs J, Keski-Rahkonen O. Full scale fire experiments on electronic cabinets. Espoo: VTT Technical Research Centre of Finland, 1994. 100 p. (VTT Publications; No. 186).