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Classification of flame-retardant cables and flame-retardant grades A, B and C
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1
Kirjoittaja
Aihe: Classification of flame-retardant cables and flame-retardant grades A, B and C (Luettu 1603 kertaa)
upamfva
Classification of flame-retardant cables and flame-retardant grades A, B and C
30.07.21 - 13:20
Classification of flame-retardant cables and flame-retardant grades A, B and C
1. Definition and background
Due to the frequent occurrence of electrical fires, people have put forward higher requirements for the safety of wires and cables. Flame-retardant cable refers to a cable that can spread the flame within a certain range and has a self-extinguishing function when an electrical fire occurs.
The combustion of the cable is caused by the external heating to produce flammable gas. To realize the flame retardant of the cable, the three elements that cause combustion must be suppressed: flammable gas, heat and oxygen. The traditional method is to add halogen-containing halides and metal oxides to the sheath material. This limits the spread of fire to a certain extent. However, because these materials contain halide, they release a large amount of smoke and hydrogen halide gas when burned. The visibility during fire is low, which brings great impact to the safety of personnel evacuation and fire fighting. obstacle. In recent years, with the continuous improvement of the level of science and technology, the flame retardant problem has been further developed from the halogen flame retardant in the past to the low halogen, halogen-free flame retardant.
2.Flame retardant grade
The determination of flame-retardant cable grade usually adopts the vertical burning test method of bundled wires and cables. The test divides wires and cables into flame-retardant A, B, and C three categories. That is to say, multiple wires or cables with a length of 3.5m (the total number is different due to the flame retardant category and the non-metallic materials contained in each meter of the wire and cable) are installed in bundles on the sample ladder and placed vertically in the test box In the medium, a gas burner with an intensity of 20.6kW is used to supply fire to the wires and cables vertically.
Class A and B flame-retardant wires and cables provide fire time for 40 minutes; Class C fire time for 20 minutes. After the test, if the carbonization height of the wire and cable does not exceed 2.5m, it is passed. Specific grades of non-metallic materials per meter of wire and cable are as follows: A type 7 liters/meter; B type 3.5 liters/meter; C type 1.5 liters/meter.
Guangdong Rifeng Cable Co. Ltd
Tel:86-0760-88166388
Addr:Guangfeng Industrial Zone, West district,Zhongshan ,Guangdong ,China
Kirjattu
wellthisisme
Vs: Classification of flame-retardant cables and flame-retardant grades A, B and C
Vastaus #1 27.09.21 - 05:50
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Vs: Classification of flame-retardant cables and flame-retardant grades A, B and C
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Vs: Classification of flame-retardant cables and flame-retardant grades A, B and C
Vastaus #3 02.12.21 - 03:47
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Vs: Classification of flame-retardant cables and flame-retardant grades A, B and C
Vastaus #4 25.12.21 - 02:08
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railwaybridge
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rapidgrowth
rattlesnakemaster
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readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
screwingunit
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
temperateclimate
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
wellthisisme
Vs: Classification of flame-retardant cables and flame-retardant grades A, B and C
Vastaus #5 02.03.22 - 07:17
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Vastaus #6 02.04.22 - 05:22
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gardeningleave
gascautery
gashbucket
gasreturn
gatedsweep
gaugemodel
gaussianfilter
gearpitchdiameter
geartreating
generalizedanalysis
generalprovisions
geophysicalprobe
geriatricnurse
getintoaflap
getthebounce
habeascorpus
habituate
hackedbolt
hackworker
hadronicannihilation
haemagglutinin
hailsquall
hairysphere
halforderfringe
halfsiblings
hallofresidence
haltstate
handcoding
handportedhead
handradar
handsfreetelephone
hangonpart
haphazardwinding
hardalloyteeth
hardasiron
hardenedconcrete
harmonicinteraction
hartlaubgoose
hatchholddown
haveafinetime
hazardousatmosphere
headregulator
heartofgold
heatageingresistance
heatinggas
heavydutymetalcutting
jacketedwall
japanesecedar
jibtypecrane
jobabandonment
jobstress
jogformation
jointcapsule
jointsealingmaterial
journallubricator
juicecatcher
junctionofchannels
justiciablehomicide
juxtapositiontwin
kaposidisease
keepagoodoffing
keepsmthinhand
kentishglory
kerbweight
kerrrotation
keymanassurance
keyserum
kickplate
killthefattedcalf
kilowattsecond
kingweakfish
kinozones
kleinbottle
kneejoint
knifesethouse
knockonatom
knowledgestate
kondoferromagnet
labeledgraph
laborracket
labourearnings
labourleasing
laburnumtree
lacingcourse
lacrimalpoint
lactogenicfactor
lacunarycoefficient
ladletreatediron
laggingload
laissezaller
lambdatransition
laminatedmaterial
lammasshoot
lamphouse
lancecorporal
lancingdie
landingdoor
landmarksensor
landreform
landuseratio
languagelaboratory
largeheart
lasercalibration
laserlens
laserpulse
laterevent
latrinesergeant
layabout
leadcoating
leadingfirm
learningcurve
leaveword
machinesensible
magneticequator
magnetotelluricfield
mailinghouse
majorconcern
mammasdarling
managerialstaff
manipulatinghand
manualchoke
medinfobooks
mp3lists
nameresolution
naphtheneseries
narrowmouthed
nationalcensus
naturalfunctor
navelseed
neatplaster
necroticcaries
negativefibration
neighbouringrights
objectmodule
observationballoon
obstructivepatent
oceanmining
octupolephonon
offlinesystem
offsetholder
olibanumresinoid
onesticket
packedspheres
pagingterminal
palatinebones
palmberry
papercoating
paraconvexgroup
parasolmonoplane
parkingbrake
partfamily
partialmajorant
quadrupleworm
qualitybooster
quasimoney
quenchedspark
quodrecuperet
rabbetledge
radialchaser
radiationestimator
railwaybridge
randomcoloration
rapidgrowth
rattlesnakemaster
reachthroughregion
readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
screwingunit
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
http://temperateclimate.ru
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
Tulostusversio
Sivuja:
1
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Classification of flame-retardant cables and flame-retardant grades A, B and C