class 1 div 1 flexible conduit

2021/05/21

Even so, that may not be the only hazard that needs to be considered (see photo 5). 1.5 In Canada, the requirements in this standard generally address class of workmanship in. ACK6F-A includes 5 six ounce cement pouches. Only digits are allowed. Since ignitible concentrations are expected under normal conditions, it is also anticipated that these faults could result in an explosion within the wiring method that must be contained. Suitable for 300 and 600 volt applications. Description: The flexible inner core is identical to that found in Type LA. For installation outdoors, on an insulator or under conduits (sheaths, gutters etc.). Where the outer sheath is made of copper, it must provide an adequate path to serve as an equipment grounding conductor. Wiring methods permitted in these spaces include threaded rigid metal conduit and threaded steel intermediate metal conduit. A liquidtight flexible steel conduit designed specifically for extreme hot or cold environments. www.ecmweb.com is using a security service for protection against online attacks. These fittings are suitable for use in hazardous locations where flammable gases, vapors, powdered metals, or dust is present. Although the wiring is not an ignition threat, due consideration should be given to the operation of the circuit. Hyundai Premium Efficiency Motors: Rigid Base, Hyundai Rigid Base: 575 volt -- HHI, Linear Limit Switches - These circuits are not dependent on the protection provided by the wiring method to prevent ignition of a flammable atmosphere.

Threaded rigid metal conduit (Type RMC) or threaded steel intermediate metal conduit (Type IMC). These fittings include a grounding lug that holds a grounding wire for bonding applications. A 7/8" (22 mm) knockout is standard for 1/2" conduit connections. An untrained handyman could install this conduits cabling system. Side rotary switches are user-selectable CW, CCW, or both. This UL approved Class 1, Div 1, Groups B, C, D Very cost effective cabling system is all you will ever need. These general requirements apply to the wiring in Class I, Class II, and Class III locations under the Division system. GlobalSpec 2022 All Rights Reserved. Code calculators automatically generate a detailed list of requirements. Wiring requirements for the Class I, Zone system are found in 505.15. They provide Class 1 protection against electrical shock. (see photo 8). BRONZE BRAID, BRASS CORE MATERIAL 36 INCH UL 886, CSA C22.2 APPROVAL CLASS I GROUP D, CLASS II GROUP E F G, CLASS III ENCLOSURE 1-1/2 INCH TRADE SIZE (1) MALE NIPPLE, (1) UNION END TYPE BRASS END, DUCTILE IRON UNION FITTING MATERIAL UNILET[R] BRAND INCLUDES. GET YOUR CEUS TODAY, 1998-2021. grain. Compressor Panels use it as all you are doing is providing mechanical protection.. You have to run an external EGC too I have been told. Unpack the code through illustrations and descriptions. These fittings join liquid-tight conduit to fixtures, electrical boxes, or enclosures with a straight connection. National Electrical Code 2020 of Illinois, (B) Special Occupancies, Class I Locations, National Electrical Code 2017 of Illinois, 500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2, Article 501 Special Occupancies, Class I Locations, (1) Special Occupancies, Class I Locations. This process is automatic. However, those involved with electrical installations should be aware that many occupancy standards and recommended practices do limit wiring methods or modify general wiring requirements in unclassified locations near classified spaces. They have a split gland ring that slips onto liquid-tight conduit to form a tight seal. They have a split gland ring that slips onto liquid-tight conduit to form a tight seal. You will be redirected once the validation is complete. Hall Effect Shaft Speed Sensor -- 1101, Flow Transmitters - See NMLT connectors for further information. Quickly locate sections across your jurisdiction. Therefore, the wiring method is not limited. The requirement to be wrenchtight is one of the most important installation rules for conduit installed as a wiring method for hazardous (classified) locations.

Physical installation of the cable must be done in a manner to prevent tensile stress on these terminations (see figure 4 and photo 2). The National Electrical Installation Standards (NEIS) includes a family of publications that provide excellent guidelines and criteria for what constitutes good workmanship in electrical contracting. The connection stands up to wet and corrosive environments. The cable is typically less expensive that two explosion proof junction boxes, 2 ericsons and two sealoffs. Where flexible cord is installed as provided in 501.10(A) and 501.140, the cord must be listed for extra-hard usage and include an equipment grounding conductor A review of NEC Table 400.4 will provide a description of the cords that are considered extra-hard usage. As mentioned above, the provisions in 400.8 are applicable to cords installed in accordance with 501.140. Simple: The modularity of the. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 30 Amp Permanent Series Single and Multiphase GFCI, Hall Effect Proximity Sensors - connector body style - Suitable for use in hazardous locations per Class I, Div. Some listed explosionproof enclosures may require only 4 threads fully engaged because of the factory provided NPT entries; these are recognized by exception to the general requirement. 16.25OZ 460.1G Kwiko TwinPak Sealing Cement. In many cases, the integrity of explosionproof enclosures depends on this requirement being satisfied [see figure 2]. Cables are permitted to be rated up to 35 kV. The cable system provides a simple solution to many difficult wiring problems and makes for a dependable and permanent installation for virtually all types of electrical circuits. 1 & 2, Class III, Div. flow ranges (0-1 GPM to 0-10 GPM). electrical Standard for Industrial Machinery NFPA-79. Multispectrum Infrared Hydrogen Flame Detector -- Model X3302, Standards and Technical Documents - The connection stands up to wet and corrosive environments. Informational Note: For the requirements for electrical and electronic, Informational Note: See the information on construction, testing, and marking of cables and cable. Extreme care must be applied to select a fitting that matches the cord diameter to ensure that the explosionproof integrity of the enclosure is not compromised. Meets the same tough standards as UL, "Reduced Wall Flex". B Class F insulation Service Factor 1.15 Flexible Conduit Box Location (Available as Top, Right or Left Mounted) Easy conversion to F1, F2 (Fitted removable mounting feet) Double Shielded Ball Bearings Provision for drainage holes in lowest, Description: Type TC-ER cable shall include an. You must have JavaScript enabled in your browser to utilize the functionality of this website. With these wiring methods, it is anticipated that ground faults and/or short circuits could take place within them and they would be able to contain those faults. Where the outer sheath is made of steel, a separate equipment grounding conductor shall be provided. JavaScript is disabled. However, there are specific spacing requirements between IS circuits and those not instrinsically safe. Each cable is color coded to match the equipment that it is connecting to. Often equipment and wiring installations have to be located within hazardous (classified) locations, and safe installations require a thorough understanding of more restrictive wiring rules. Fittings available in the marketplace are either listed as explosionproof or not listed as explosionproof. Since overcurrent protection is crucial to reliable electrical system operation and safety, overcurrent device selection and application should be carefully considered. The other end inserts into a knockout and tightens down with a locknut. Multiple fault output options are available. When the circuits are intrinsically safe, the energy is maintained at a level where it cannot ignite the atmosphere if the circuit is opened, shorted, or faulted to ground or other faults occur. The installation of ITC-HL cable is limited by the Code to industrial establishments with restricted public access and facilities where the conditions of maintenance and supervision ensure that only qualified persons service the installation. ANSI/NECA NESI-1 provides general requirements for good workmanship in electrical contracting, and NEIS 101 provides specific installation guidelines for rigid metal conduit, intermediate metal conduit, and coated rigid metal conduit. 1&2, Nema 4X and IP65 ratings. Where a color code is used for intrinsically safe circuit conductors or wiring, such as raceways, boxes, and so forth, the color light blue is required [NEC, 504.80(C)]. 18.4 or UL 2239. This UL approved cable is manufactured from completely inorganic material. This type of cable is permitted to be used in Class I locations when the termination fittings are listed for this location. Movement of these mechanical devices requires more flexibility than was required in the past, which often necessitates the use of more flexible cords and greater lengths of flexible cord to complete electrical installations. Fittings: Suitable for use with nonmetallic fittings marked for FNMC-B or LFNC-B for liquidtight flexible nonmetallic conduit Type B or with standard metal liquidtight fittings. The termination fittings are specifically listed for Class II, Division 1 locations. Since Class I, Division 1 locations are expected to include ignitible concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors under normal operating conditions, the wiring requirements are more restrictive (see photo 1). and 3/4? When situations in an electrical installation warrant flexible connections in Class I, Division 1 locations, two options for the wiring methods are permitted: flexible fittings and flexible cord. . This is always a practical approach and a good exercise of ingenuity, although it is not always possible. Some sizes are listed only for Groups C and D, while others are available for Groups A, B, C and D. These fittings are very rugged and suitable for physical abuse while providing flexibility for difficult installation or vibration of equipment. The product will be reserved for you when you complete your order. Submit your email address and receive a link to reset your password: Use this job address for your current shipping address? In cases where increased use of robotics is employed, overall safety is improved because less human involvement is required to perform functions that were once extremely labor intensive. Sign In to access your account information. The copper sheath and conductors, insulated with magnesium oxide ensure that the cable is able to withstand the effects of fire and is fully usable afterwards. Our specially designed PVC jacket passes the stringent requirements of the VDE test 0281 part 1 and HD 21.1 oil test providing, Description: These fittings join liquid-tight conduit to fixtures, electrical boxes, or enclosures at a 90 angle. It is made of a high strength aluminum alloy, approximately, ELECTRI-FLEX COMPANY, Roselle, IL USA, manufactures, AI Gateway and hyperspectral imaging plug-in developed with per, Industrial Computers and Embedded Systems, Material Handling and Packaging Equipment, Electrical and Electronic Contract Manufacturing, RTD Temperature Probes - Description: 1 & 2 - Flexible metallic conduit grip insulated - UL Listed CSA Certified, Description: The listing for the fittings ensures that these threaded connections result in an explosionproof assembly. Type TC-ER-HL cable is permitted as a flexible wiring method in industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons service the installation, for applications limited to 600 volts, nominal, or less, and where protected from damage by location or a suitable guard. It is a factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation enclosed in a liquidtight and gastight continuous copper or alloy steel sheath. STRAIGHT TYPE STAINLESS STEEL MATERIAL LIQUIDTIGHT CONDUIT USED ON CSA C22.2 APPROVAL 3/8 INCH TRADE SIZE NON-INSULATED THROAT TYPE ENCLOSURE CLASS I DIV 2, CLASS II DIV 1 AND 2, CLASS III DIV 1 AND 2, Description: Where necessary to employ flexible connections, as at motor terminals, one of the following shall be permitted: Where seals are required for boundary conditions as defined in. 1 work (explosive proof for gases) and have never used standard liquid-tight (metallic) flex conduit. Fittings: Suitable for use with nonmetallic fittings marked for FNMC-B or LFNC-B for liquidtight flexible nonmetallic conduit Type B or with standard metal liquidtight fittings.

Leverage the most sophisticated code compliance platform. The permission provided in several of the special occupancies required that rigid PVC conduit be installed below a minimum of 600 mm (24 in.) The cables eliminate the need for expensive labor. Union, 1 Inch, Female/Female, Aluminum, Conduit to Conduit, Explosion-Proof/Dust-Ignitionproof. Note: Product availability is real-time basis and adjusted continuously. It must be made up wrenchtight and have five threads fully engaged where connected to explosionproof enclosures. These fittings are suitable for use in hazardous locations where flammable gases, vapors, powdered metals, or dust is present. This identification requirement applies to raceways, cables, cable trays, and other wiring methods used for intrinsically safe system wiring. Maximum amount of digits: 6. The Code does not prescribe which option must be selected, but users must realize that this location has or could have ignitible concentrations of flammable vapors under normal operation. Wiring methods permitted in Class I, Division 1 locations are identified in Sections 501.10(A) and include threaded rigid metal or threaded steel intermediate conduit. Description: The concern here is the possibility of compromising the intrinsic safety of the circuit through inductive or capacitive coupling conditions related to close proximities of other wiring. loading, battery rooms, compressor areas, generators, refrigerants, gas plants. 1, Group B, C, D and, Description: Sunlight Resistant (UV) Sunlight Resistant (UV) APPLICATION: This conduit is intended for use according to the Canadian Electrical Code (CEC CSA 22.1) as described in clause 12-1300 for dry, damp or wet locations. The Code currently permits any type of metallic sheath, but the product standard (UL 2225) limits the sheathing material to aluminum. Other key requirements in Article 504 include rules for separation, identification, and conduit sealing. BRONZE BRAID, BRASS TUBING MATERIAL 15 INCH UL 886, CSA C22.2 APPROVAL CLASS I DIV 1 AND 2 GROUP A B C D, CLASS I ZONE 1 AND 2 GROUP IIA IIB IIC, CLASS IIDIV1 AND 2 GROUP E F G, CLASS III ENCLOSURE 1/2 INCH TRADE SIZE (1) FEMALE UNION, Description: No need for expensive sealoffs and ericsons. All of these systems provide acceptable protection of the electrical circuits and containment of possible faults to prevent ignition of surrounding ignitible atmospheres. All units are available in an Automatic or Manual (safe start) reset type. or by grounded metal partitions or insulating barriers. flexible liquid-tight conduit fittings (RTDZ/S-LT models) Intrinsically Safe (IS) Class I, Div I (A, B, C, D), Class II, Div I (E, F, G) I.S. through 100 mm (4 in.). Since a Class I location is a space where flammable vapors exist in an ignitible concentration with air, the possibility of appreciable amounts of oxygen necessary for combustion would normally occur only in voids of underground spaces. JavaScript seems to be disabled in your browser. A failure in the wiring system in any location is never desirable, but the risk of explosion that exists in hazardous (classified) locations provides urgent reasons to ensure that the minimum requirements of the Code are met. These fittings are suitable for use in hazardous locations where flammable gases, vapors, powdered metals, or dust is present. Sealing Fitting, Vertical/Horizontal, 1 1/2 Inch, Female, 25% Fill, Malleable Iron, For Use With Rigid/IMC Conduit in Close Turing Radius. Note ground wire is connected, Description: In addition to the more robust wiring methods described above, where the wiring is intrinsically safe, any wiring method permitted for unclassified locations and any wiring method or cabling system recognized in Chapters 7 or 8 of the NEC is permitted [NEC, 504.20]. The reduced outer diameter permits easy handling and installation in confined areas. 1: Seals are provided in conduit and cable systems to minimize the passage of gases and vapors and prevent the passage of flames from one portion of the electrical installation to another through the conduit. Should the circuit have a safety function that would be lost if the circuit were damaged, then the wiring method would become very important. The termination fittings are specifically listed for Classes I , Division 1 locations. I believe you can use it in Zone 1 areas on Intrinsically Safe systems.. The cable complies with Articles 330, 500 and 501 and all other applicable provisions of the National Electric Code. 2: For information on construction, testing, and marking of cable. I have done quite a bit of Class 1 Div. The connection stands up to wet and corrosive environments. Click here for instructions on enabling javascript in your browser. Built for difficult industrial applications, a weatherproof enclosure protects the electronics with Class 1, Div. The Code permits any wiring method that is acceptable for an unclassified location to be used for intrinsically safe (IS) circuits. Where this wiring method is selected, the responsible decision-making party must be prepared to demonstrate to the authority having jurisdiction (AHJ) through adequate documentation that those conditions do indeed exist (see photo 4). These fittings join liquid-tight conduit to fixtures, electrical boxes, or enclosures at a 45 angle. RTD Temperature Sensor -- RTDS-LT (Right-Angle), Multiconductor Cables - They have a split gland ring that slips onto liquid-tight conduit to form a tight seal. for the larger sizes. If account exists, an email will be sent with further instructions. Likewise, separate sections of this wiring created by walls, partitions, or other enclosures are required to be identified. By using this site, you agree to our Privacy Policy and our Terms of Use. requirements defined in NEMA MG-1 table 12-12 3-year warranty NEMA Design B Cast iron frame and conduit box Inverter ready, 10:1 CT / 20:1 VT Double drilled feet to accommodate mounting flexibility (324T-447T) F2 field mountable Class I, Description: HLR 750 Series -- HLR 750-6000, Speed Sensors - A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. I don't know the similarities and differences between NEC and CEC regarding Hazardous locations, but you can't use regular seal-tite in a class 1 div 1 location here. The other end inserts into a fixture, electrical box, or enclosure and tightens down with a locknut. Browse Machine Vision Systems Datasheets for Pleora Technologies Inc. Browse Patch Panels Datasheets for Belden Inc. Browse Shrink Tubing Datasheets for Daburn Electronics & Cable, Units of Measure: English Size, Metric Size, Cable Conductor: Copper and Copper Alloys, Cable Insulation: Polyvinyl Chloride (PVC), Linear Actuator Types: Pushbutton or Plunger, Features: Adjustable Time Delay, Automatic Self-test, Explosion Proof, NEMA 4 Rated Enclosure, Device Type: Ground Fault Circuit Interrupters (GFCI), ElectricalOutput: Analog Current, Analog Voltage. Generate a code sheet that integrates with your drawing set. A reliable and up-to-date source of codes. Plug, Close-Up, Recessed Head, 1 1/4 Inch, Explosion-Proof, Aluminum, For Use with Rigid/IMC Conduit, Plug, Close-Up, Recessed Head, 1 1/4 Inch, Explosion-Proof, Malleable Iron, For Use with Rigid/IMC Conduit, Allowed files: docx | doc | zip | png | gif | jpg | tiff | pdf. This cable can be used without conduit (exposed runs). This is a multi-conductor, gas and vaportight continuous corrugated metal-sheathed cable provided with an overall polymeric jacket and an additional equipment grounding conductor sized in accordance with NEC 250.122. Provisions to include the current exception into Article 501 permit Type PVC and Type RTRC conduit to be installed underground in any facility that includes Class I locations. Pre-measured Kwiko cement and Pre-measured water (in an inner bag). Wiring requirements within Class I hazardous areas using Division system are found in Part II of Article 501. This is a multi-conductor, gas and vaportight continuous corrugated metal-sheathed cable provided with an overall polymeric jacket and may or may not include an additional equipment grounding conductor sized in accordance with 250.122 (see photo 5.04). Description: In addition, the unit can be installed as a panel mount. prior to the point where the bend to emerge from the earth occurred. Rotary Limit Switches - Has to be the spendy explosion proof stuff. The copper cable sheath meets NEC grounding requirements. Type MI cable, and within specific industrial applications, listed Types MC-HL and ITC-HL cable systems are permitted. 1: For information on construction, testing, and marking of Type P cable, see ANSI/UL 1309-2017, Informational Note No. fitting that can connect to PVC, EMT, Burial and Flexible conduits. Informational Note No. Type TC-ER-HL cable is required to have an overall jacket and a separate equipment grounding conductor(s) in accordance with 250.122 [501.10(A)(2)(3)]. An HLR LVDT's lead wires exit through a radially mounted 1/2-14 NPT male threaded conduit fitting for easy attachment to an explosion-proof junction box as well as rigid or flexible conduit. H07V-U rigid wires are used for domestic circuits in conduits or tubing, or for wiring and cabling electrical device panels. STRAIGHT TYPE MALLEABLE IRON (BODY/NUT) MATERIAL FLEXIBLE METALLIC CONDUIT USED ON UL 514B, CSA C22.2 APPROVAL 5 STANDARD PACKAGE 1-1/2 INCH TRADE SIZE NON-INSULATED THROAT TYPE ENCLOSURE TYPE CLASS I DIV 2, CLASS II DIV 1 AND 2, CLASS III DIV, Description: Description: MI cable has multi-piece fittings that are threaded together when installed. Additional examples can be found in documents such as NFPA 50B, Liquefied Hydrogen Systems at Consumer Sites, which prohibits the installation of hydrogen systems beneath electric power lines. Where the circuits installed are intrinsically safe, as verified by the control drawings, the Code permits the use of any wiring method suitable for use in unclassified locations, including those permitted in Chapters 7 and 8 [NEC, 504.20]. of Articles 511 through 516. 2: Gas or vapor leakage and propagation of flames may occur through the interstices between the strands of standard stranded conductors larger than 2 AWG. Where this wiring method is selected, the responsible decision-making party must be prepared to provide documentation to the authority having jurisdiction that those limiting conditions exist, and the AHJ must be prepared to evaluate the submitted documentation and determine if it meets the criteria specified for use of this method (see photo 3). Two characteristics of workmanlike installations in hazardous (classified) locations include tightness of fittings and suitable securing and supporting of the rigid metal conduit as required. Some raceways are installed in underground applications where flammable liquids are stored, handled or processed above those spaces. Ground Rod and its little-known use in the NEC, Back to Basics The 480/277 V to 208/120 V Wye Transformer Installation, Industrial Safety: Supplying Headlamps as Critical PPE in Hazardous Locations, 700.10(A) and Identification of Emergency System Wiring and Circuits, Disconnecting Means for Motor and Air-conditioning Equipment. 4-20 mA Shaft Speed Sensor -- ST420-DI, Thermocouple Temperature Probes - Description: In industrial establishments with restricted public access, where the conditions of maintenance and supervision ensure that only qualified persons, Flexible cord in accordance with the provisions of 501.140, terminated with, Rigid metal conduit (Type RMC) and intermediate metal conduit (Type IMC) with listed threaded or threadless, Types PLTC and PLTC-ER cable in accordance with Part II or III of, Types ITC and ITC-ER cable as permitted in, Type MC, MV, TC, or TC-ER cable, including installation in cable tray systems. Type ITC-HL is suitable for use in Class II, Division 1 hazardous (classified) locations. The connection stands up to wet and corrosive environments. On the other hand, the use of flexible cord should always be minimized where other methods can be utilized to connect electrical circuits to equipment. Rapidly and efficiently calculate project parameters. 931 XP (Explosion Proof) Class I, Div I (C, D) Class II, Div I (E, F, G) Class III XLB-1 enclosure The 931 XP is mounted in a cast aluminum enclosure and is supplied with a mounting bracket and 10 feet of 3-conductor shielded. Use of certain types of non-metallic conduit in underground installations evolved from permission for use in bulk storage facilities in the 1950s to an exception that permitted the use underground in any facility with Class I locations in 1996. Heavy-duty plug-in switches have a double seal on the head and complete gasket cover. Flexible fittings, sometimes called explosionproof flex, are available from several manufacturers in sizes 13 mm ( in.) To produce assemblies, the cable is cut to the desired length, pigtails are brazed on and terminated with union type glands with male NPT threads. Within those threading requirements are provisions for adapting from National (American) Standard Pipe Taper (NPT) to metric threading. Intrinsically safe systems include control drawings, and the zener diode barriers often reference a particular control drawing as well (see photos 6 and 7). In an ideal and most conservative situation, the installation of underground raceways below these spaces should be avoided. Such communication through Type MI cable is inherently prevented by construction of the cable. These wires are commonly used to obtain better contact and greater resistance to vibration. Excerpted from Hazardous Locations, Third Edition, Published by IAEI. The cords must be continuous; they must be supported or secured to prevent tension on the terminal connections; be terminated with a cord connector or attachment plug listed for the location and they must be sealed where they enter explosionproof enclosures or boxes to maintain the explosionproof integrity of the enclosure. The general requirements of Chapters 1 through 4 apply to these installations unless modified or amended by the specific applicable rules in Chapter 5. Conductors of intrinsically safe circuits are permitted where they are separated from nonintrinsically safe circuit conductors by a space of not less than 50 mm (2 in.) These fittings are suitable for use in hazardous locations where flammable gases, vapors, powdered metals, or dust is present. Temperature extremes and highly corrosive liquids and vapors can affect the ability of seals to perform their intended function. Informational Note No. In many facilities or installations, raceways must be installed underground to electrical equipment located in the aboveground space. concrete-encasement on the underground installation of Type PVC and Type RTRC conduit where it was installed in a location not already addressed in Articles 511 through 515. The product standard used to evaluate these is UL 1203 Explosionproof and Dust Ignitionproof Electrical Equipment for Use in Hazardous (Classified) Locations. They have a split gland ring that slips onto liquid-tight conduit to form a tight seal. It is important to consider all of the activities that take place on a normal basis that might subject flexible cords to physical damage and to provide proper precautions to protect the cord or cable where it is used.

They form a tight seal to protect wire and cable in areas where flammable gases, vapors, powdered metals, or dust is present, and they also stand up to wet and corrosive environments. Get everyone on the same page and streamline code research. Type MC-HL is permitted in Class I , Division 1 hazardous (classified) locations. The conduit must be threaded with a National (American) Standard Pipe Taper (NPT) thread that provides a 1 in 16 ( inch) taper per foot. The concrete-encasement provided some additional protection where normal activities within facilities are less predictable than those within the special occupancies (see figure 3 and Table 1 for further information on the evolution of wiring methods and on Type RTRC conduit). The other end inserts into a knockout and tightens down with a locknut. The control drawing is required for proper installation of these systems and is also necessary for making an inspection (see the annex for an example of a typical intrinsically safe system control drawing). The installation of MC-HL cable is limited by the Code to industrial establishments with restricted public access and facilities where the conditions of maintenance and supervision ensure that only qualified persons service the installation. Sealing Fitting, Vertical/Horizontal, 1 1/4 Inch, Female, 25% Fill, Malleable Iron, For Use With Rigid/IMC Conduit in Close Turing Radius.