Should explosion-proof flexible connecting conduits be installed or not?？

weOneRiseComeLeading看OneNextfollowingSeveralStandardRegulations:

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

no.7.4.8ChipsArticleBody Text:CableconductPipe And Detectioncomponent Or on-siteInstrumentTableInArea，MostShould挠PerformancePipeLinkedWelding，ShouldDistributionWithWaterproofCurved。Connections with field instrument boxes, junction boxes, terminal boxes, etc., should be sealed and firmly fixed.。

Its explanatory note: To prevent dust, water, and other liquids from entering the detection element or field instrument, flexible conduit connection can be adopted. Some projects also use interrupted connections between the cable conduit and the detection element or field instrument, using sealing fittings when cables enter the detection element or field instrument.。

2、SH/T3521-2013《PetrochemicalInstrumentTableEngineeringconstructionTechnical Regulations》

no.8.4.7ChipsArticleBody Text:CableProtectionPipe And ThenRecentWorkshopDomesticInstrumentTableDisc、Instrument Box、WiringBox、ThroughWiringBoxEtc.partConnectionWhen，ShouldShouldWithSealing PerformanceForPlan， And HandlePipeSolidStableInvincibleInteractionsturdy。The protection conduit opening should be about 250mm lower than the instrument wiring inlet. Flexible conduit connection should be adopted between the detection element or nearby instrument panel. When explosion-proof flexible connecting conduits are not used, the conduit end should be made into a bell mouth shape or fitted with a wire protection cap.。When cable protection conduits are laid from top to bottom, a drainage tee should be added at the lowest point.。The instrument panel and instrument wiring inlets should be sealed with cable sealing glands.。

3、SH/T3019-2016《PetrochemicalInstrumentTablePipelinecircuitDesignstandardized》

no.7.3.6ChipsArticleBody Text:CableProtectionPipe And Detectioncomponent Or on-siteInstrumentTableInArea，Chooseexplosion-proofFlexible ConduitConnectionWhen，MaintenanceSupportPipeShouldSmallInInstrumentTableDiscIntoLineReputation约250mm，CableProtectionPipeFromSupremeTowardNextLayEquipmentCustomer FirstInstrumentTableDiscWhen，inPipetailendDemandPlusDrainLevelThreeVentilation。When flexible conduit connection is not used between the cable protection conduit and the instrument, the conduit end should be fitted with a wire protection cap (protective mouth) or made into a bell mouth shape.。

4、HG/T20512-2014《InstrumentTableDistributionPipeDistributionLineDesignstandardized》

no.8. 1. 13ChipsArticleBody Text:on-siteInstrumentTable、WiringBox、ThenRecentWorkshopDomesticInstrumentTableDisc(Cabinet)的CableLineAdvancedOutputReputation贸EasyTwoSideCableMaintenance，ShouldadoptfollowingTwoVariousform:

（1）CircuitRotateForm:CableSealingConnectorexplosion-proofFlexible Conduit And GalvanizedZincWeldingSteelPipeLinkedWelding。

(2) non-rotary type: cable sealing gland plus cable tray, or cable sealing gland plus galvanized welded steel conduit。

Based on the specific contents of the above standards, it can be seen that the explosion-proof flexible conduit is not necessarily required to be installed。The explosion-proof flexible conduit can provide advantages such as protection against mechanical damage, corrosion resistance, resistance to continuous high temperatures, waterproofing, anti-aging, and a combination of flexibility and robustness. If considered for safety protection and construction convenience, it can be used。

In fact, the wiring here is divided into two methods: "rotary type" and "non-rotary type"。

（1）CircuitRotateForm:CableLineinStainless SteelPipe Or explosion-proofFlexible ConduitDomesticcomprehensiveInvincibleGot it.Maintenance，nonDewOutput的InvincibleAspect，InvincibleAsEasyRestrictedmachineryequipmentCreate伤， Generally With2VariousSystemOperatingmethod:

A、MaintenancenonSeamlessSteelPipe→Cable Entry Device→InstrumentTableInstrumentIntoLineReputation，CableLineInvincibleOverseasDew，Such asNextDiagramLocationsIndicate。

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

(2) non-rotary type: After the cable is led out from the field instrument or junction box, within a short section, the cable protective conduit is interrupted, and a short section of cable is exposed without protection。ordinary EverywhereOperatingAlgorithm:

A、MaintenancenonSeamlessSteelPipe→OverseasDewOneSmallSectionCableLine→Cable Entry Device→InstrumentTableInstrumentIntoLineReputation，Such asNextDiagramLocationsIndicate:

OutputSelfInexplosion-proofConsiderAchieve，Mostimportant的IsCriticalWithCable Entry Device（Also Known AsCableSealsEtc.）。Common cable entry devices include explosion-proof glands, explosion-proof Y-type flange adapters, etc. Their sealing structures generally have three types: a. elastic sealing rings; b. metal or composite sealing rings; c. filler materials. Regardless of which cable entry device is used, products that meet the corresponding explosion-proof level should be used。

Special attention should be paid to the drainage issue after the cable protective conduit is laid from top to bottom. The above standards provide recommended practices。

One point that is very easy to overlook: According to GB 50058-2014 "Code for Design of Electrical Installations in Explosive Atmospheres", Article 5.4.3, Clause 5, main text (1) During normal operation, protective sealing shall be provided within the 450mm range of all ignition source enclosures。(2) For steel conduits with an outer diameter of 50mm or more, protective sealing shall be provided at a position within 450mm from the introduced explosion-proof junction box。

That is, the cable entry device shall be implemented within the 450mm range of the instrument housing。Such as:

（1）on-siteInstrumentTable→MaintenancenonSeamlessSteelPipe（LongShort＞450mm）→explosion-proofYTypeFlangeConnector→MaintenancenonSeamlessSteelPipe；

（2）on-siteInstrumentTable→nonCable Entry Device的挠PerformancePipe（LongShort＞450mm）→explosion-proofYTypeFlangeConnector→MaintenancenonSeamlessSteelPipe；Therefore2VariousWiring Layoutall And standardizedStandardInvinciblecompliant。

For specific implementation strategies of cable explosion-proof sealing measures, refer to the relevant chapters and sections of GB3836, GB50093, GB50058, and GB50257。

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The above is about whether the explosion-proof flexible conduit needs to be installed？Basic introduction of explosion-proof flexible conduit manufacturers. For more latest information, please visit Hualong explosion-proof at www.hlfangbao.com.