Should explosion-proof flexible conduit be installed or not?？

weOneRiseComeLeading看看followingSeveralstandardizedRegulations:

1、GB 50093-2013《AutomatedInstrumentTableEngineeringconstruction And qualityAcceptance Specification》

no.7.4.8ChipsBody Text:CableconductPipe And Detectioncomponent Or on-siteInstrumentTablePositionArea，ShouldUsers挠PerformancePipeConnection，ShouldEquipmentWithWaterproofCurved。Connections to field instrument boxes, junction boxes, terminal boxes, etc., should be sealed and securely fixed.。

Its commentary: To prevent dust, water, or other liquids from entering sensing elements or field instruments, flexible conduit connections can be used. In some projects, cable conduits are also disconnected from sensing elements or field instruments, and seals are used where cables enter the sensing elements or field instruments.。

2、SH/T3521-2013《PetrochemicalInstrumentTableEngineeringconstructionTechnical Regulations》

no.8.4.7ChipsBody Text:ProtectionPipe And ThenInvincibleInstrumentTableDisc、Instrument Box、Junction Box、ThroughLineBoxEtc.ComponentsConnectionWhen，ShouldWithSealingMeasures， And WillPipeSolidStablefirmSolid。The conduit opening should be about 250 mm lower than the instrument equipment inlet. Flexible conduit connections should preferably be used between the conduit and detection elements or local instruments. When explosion-proof flexible conduit connections are not used, the conduit end should be machined into a bell mouth or fitted with a wire protection cap. When the protective conduit is laid from top to bottom, a drainage tee should be added at the lowest point. The cable inlets of instruments and instrument equipment should be sealed with cable sealing glands.

3、SH/T3019-2016《PetrochemicalInstrumentTablePipelinecircuitDesignstandardized》

no.7.3.6ChipsBody Text:ProtectionPipe And Detectioncomponent Or on-siteInstrumentTablePositionArea，adoptexplosion-proofFlexible ConduitConnectionWhen，ProtectionPipeReputationShouldLowInInstrumentTableIncoming LineReputation约250mm，ProtectionPipeFromSupremeTowardNextLayCustomer FirstInstrumentTableWhen，inPipeLastendShouldPlusDrainLevelThreeVentilation。When flexible conduit is not used between the protective conduit and the instrument, the conduit end should be fitted with a cable protection cap (protective ring) or machined into a bell mouth.。

4、HG/T20512-2014《InstrumentTableDistributionPipeDistributionLineDesignstandardized》

no.8. 1. 13ChipsBody Text:on-siteInstrumentTable、Junction Box、ThenInvincibleInstrumentTableDisc(Cabinet)的CableAdvancedOutputReputationOverseasSideCable的Protection，ShouldadoptNextColumnTwoVariousmethod:

（1）ContinuityForm:CableSealingConnectorexplosion-proofFlexible Conduit And GalvanizedZincWeldingSteelPipeConnection。

(2) non-continuous type: Cable sealing glands plus cable tray, or cable sealing glands plus galvanized welded steel conduit.。

Based on the above code requirements, it can be seen that explosion-proof flexible conduit is not mandatory.。Explosion-proof flexible conduit can provide certain characteristics such as protection against mechanical damage, corrosion resistance, high-temperature resistance, waterproofing, anti-aging, and flexible firmness. It can be used if protection and construction convenience are considered.。

In fact, the wiring here is divided into two forms: "continuous type" and "non-continuous type."。

（1）ContinuityForm:CableinSteelPipe Or explosion-proofFlexible ConduitDomesticcompleteInvincibleHighlyAchieveProtection，nonOverseasDewPositionProcessing，InvincibleEasyRestrictedmachineryOverseas伤， Generally With2VariousStriveAlgorithm:

A、ProtectionSteelPipe→Cable Entry Device→InstrumentTableequipmentIncoming LineReputation，CableInvincible裸Dew，Such asNextDiagram。

B. Protective steel conduit → flexible conduit with cable entry device → instrument equipment cable entry, with the cable not exposed, as shown below.。

(2) non-continuous type: Over a relatively short distance after the cable is led out from the field instrument or junction box, the protective conduit is interrupted, and a short section of cable is exposed without protection.。commonStriveAlgorithm:

A、ProtectionSteelPipe→裸DewOneSmallSectionCable→Cable Entry Device→InstrumentTableequipmentIncoming LineReputation，Such asNextDiagram:

OutputInexplosion-proofConsider，keyIsCriticalWithCable Entry Device（AlsoCalledCableSealsEtc.）。Common cable entry devices include explosion-proof glands, explosion-proof Y-type sealing joints, etc. Their sealing forms generally include three types: a. Elastic sealing ring; b. Metal or composite sealing ring; c. Packing material. Regardless of the cable entry device used, products meeting the corresponding explosion-proof rating must be used.。

It is worth noting that drainage issues should be considered when the protective conduit is routed from top to bottom. The above codes provide recommended practices.。

One point that is easy to overlook: According to Article 5.4.3, Clause 5, Main Text (1) of GB 50058-2014 "Code for Design of Electrical Installations in Explosive Atmospheres", isolation sealing shall be provided within 450mm of the enclosure of all ignition sources during normal operation.。(2) Isolation sealing shall be provided within 450mm of the flameproof junction box where steel conduits with a diameter of 50mm or more are introduced.。

That is, the cable entry device shall be implemented within 450mm of the instrument equipment enclosure.。Such as:

（1）on-siteInstrumentTable→ProtectionSteelPipe（LongDegree＞450mm）→explosion-proofYTypeSealingConnector→ProtectionSteelPipe；

（2）on-siteInstrumentTable→nonCable Entry Device的挠PerformancePipe（LongDegree＞450mm）→explosion-proofYTypeSealingConnector→ProtectionSteelPipe；ThereforeTwoVariousDistributionLineAll And standardizedrequirementsInvincible符。

For cable flameproof sealing measures and implementation methods, refer to the relevant chapters of GB3836, GB50093, GB50058, and GB50257.。

explosion-proofFlexible ConduitManufacturer

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The above is about whether flameproof flexible connecting conduits should be installed or not.？Introduction to the manufacturer of explosion-proof flexible connecting pipes. For more related information, please visit Hualong Explosion-proof at www.hlfbdq.com/.