CLAMP STRAPS MC FEEDER CONNECTION WITH ADJUSTABLE CLAMP STRAP . Bracket and Hardware Kit w/ Clamp Kit 0.94 to 0.61 23.7 to 15.5 919 * Torque value 50 (in - lbs) / 5.6 (Nm) NOTE: For assembly of bracket to housing only The given wire O.D. Where more than two NM cables containing two or more current-carrying conductors are installed, without maintaining spacing between the cables, through the same opening in wood framing that is to be fire- or draft-stopped using . The 3/8 hole is a starter hole for a knock out or to drill it out. The larger the hole for the ROMEX wire the better off you are, as long as you don't compromise the structural integrity of the 2-by-4. NM cable is counted as one conductor and the largest dimension is used to calculate area. $1.03 651SP. Manual Release Bracket - Locking Side no Cable Clamp * Strap, Single Screw, Zinc Die Cast, Oval . Based on NEC conduit fill, 3/4" conduit is not large enough for 2 cables of 12-2 Romex. Size Industrial design 1,1 189 Block form . c.s.a. Non-Metallic Boxes & Covers. Halex 1 in. Hi-Torque clamps are reusable and easy to retighten after expansion. SC-400-NM. (a) Each cable is fastened within 1 ft from the raceway. *Listed for MCI only. Consider at least a 6x6 box. Two conductors in conduit is to use a 31% fill. Conduit & cable clamps Conduit Static UPC/Part Catalog Size OD Range Load Box Number Number EMT & Inches Cap. metric cable imperial cable nom. We use electrical boxes of varying sizes or capacity (in cubic inches) because the number of electrical wires, connectors, devices varies as well. Nut - Torque to 95-105 (in-lbs), 11-12 (Nm) Cable Lug Cable Lug Terminal Washer* Washer* Cable Lug Terminal AP Connector Torque to 50-70 (in-lbs), 6-8 (Nm) Terminal AP Connector Torque to 50-70 (in-lbs), 6-8 (Nm) Bolt Bolt Number Number Size Size Cable 407-DC2G. Wire Size & Amp Ratings Cable Lugs & Connectors LV Lugs & Splices Part number Size Conductor Size AA16-M 8mm 16mm2 AA25-M 8mm 25mm2 AA35-M 8, 10mm 35mm2 AA50-M 12, 14mm 50mm2 AA70-M 12, 14mm 70mm2 AA95-M 12, 14mm 95mm2 Part # 952. Open the catalog to page 21. Signage clamp. Ampacity Charts COPPER ALUMINUM Wire Gauge Size 60C (140F) 75C (167F) 90C (194F) 75C (167F) 90C (194F) NM-B THW THWN-2 THW XHHW-2 UF-B THWN THHN THWN THHN--- SE XHHW-2 SE TWHN-2--- USE --- USE ----- XHHW --- XHHW ---14 15 20 25 --- --- . Specify the clamps. 79903860162 1BL050 2" 0.65 0.89 200 100 . Drawing Installation Instructions. Specify the ferrules. Products . Allow suppliers whose models I configure/download from 3DCC to contact me. equiv c.s.a. . (e) Each cable sheath extends not less than in. connections, please use the following guidelines for cable size, torque values and terminal protection. 84 product (s) found. Grayloc connector consists of two hubs, one seal ring, one set of clamps, stud bolts, and spherical-faced nuts. 1.050. Therefore, the wire size for 60 amp 220v, for example, is still 6 to 4 AWG. Romex connector used to secure connection of flexible cables or NM -B cable box. N-Type connectors are designed to satisfy the need for a durable, weatherproof, medium-size RF connector with consistent performance which includes models that support up to 18 GHz. . author * created date: 10/7/2008 1:56:13 pm . For 60 ampere breakers, electricians and professionals suggest using a wire size gauge ranging from 6 AWG to 4 AWG. size NM cable range Unit qty. You should use a trade size 3/4" connector or bigger for a 10/3 cable. Number Number Size Size Cable MALLEABLE IRON (REGULAR OPENING) 4 SCREW, STRAP TYPE CONNECTORS Grounding, Bonding, Splicing. The 1/2 inch is the id, then you have the wall thickness that the treads are cut into. Features and Benefits. (c) Fittings are provided on the raceway to protect the cables from abrasion. UL# E123751. The NORMACLAMP Hi-Torque Signage Clamp is produced using components entirely manufactured from stainless steel. An insert clamps the cable in place and provides more strain relief than standard snap-in cord grips for building cable. 1/2. : Product UPC-A Labeled: APC Romex connectors can be installed where UL listed product is required. Standard Carton : Weight/ Carton (Lbs) A This will depend on the type of conduit and wire that you're using. If you go by the 1/3 rule, then 1 1/8 diameter is the maximum diameter, but that only gives the wire 1 1/8-inch protection from nails and wall board screws. Our Hose Clamps can be hand tightened up to 15.5 NM without the screw slipping or distorting the screw cage during its installation and . 1/2" is the smallest trade size available/allowed. 0.365. Pkg. Jul 19, 2017 It's a trade size not a measurement. Specify the cable. CLAMP CONNECTOR. Type NM is intended for installation in accordance with Article 356 of the NEC (ANSI/NFPA-70) for Flexible Liquidtight Nonmetallic Conduit (LFNC-B or FNMC-B). The centering ring contains a rubber elastomer o-ring. The flex-lock construction provides better flexibility with a leak-free connector, while universal fit allows for installation flexibility. Across from the wire gauge, you'll find the maximum number of wires that can be placed inside your conduit diameter. Size: 6 AWG Number of Conductors: 3 PVC Insulation Thickness: 0.76 mm / 0.029 inches Ground Wire Size: 10 AWG 1.280. . The PYI Hose Clamp utilizes a durable riveting screw cage design that is machined from a single piece of 316L stainless steel which is capable of withstanding high tightening torque and internal hose pressure. As eddy indicated you can use it as mechanical protection provided it is done properly. Wt. N Female Cable Clamp Jack; UG-23D/U, F/U S G T RFN-1024-1SI 15 N Female Crimp Cable Jack N G T RFN-1028-I 16 N Female Crimp Cable Jack; UG-1688/U S G T RFN-1028-SI 16 tNC TNC Male Clamp Plug S G T RFT-1201-SI 17 TNC Male Clamp Plug N G T RFT-1202-I 18 TNC Female Clamp Jack N G T RFT-1214-I 19 TNC Female Crimp Jack N G T RFT-1216-I 20 UHF You might have 3/8ths cable end, but they don't make 3/8 electrical male end connectors. Cableway Wire Fill; Cord Grips Cable Ranges; . Cable with 10-gauge wires has orange sheathing (used for 30-amp circuits). 2 Screw Connectors for Oval NM Cable, 3/4" Size, NM Clamp Type, Fits oval NM 8-2 to 6-3 Wire, Non-Watertight, Zinc Die Cast. N-Type Connectors. 370-4 and 250-114a 8. Home / Products / Non Metallic Sheathed Cable / Clamp Connector. Non-Metallic (NM) Twin-Screw Clamp Connector ( 15) $298 1-1/4 in. NM - Non Metallic Sheathed Cable. In this video we discuss what BX connectors are and. information is an estimate. ins mm inch 0.5 1/0.80 .00077 .80 .032 1/029 .029 - - - - - 1/036 .36 1.0 . Metric. Table 1. Use to connect building cable for dry locations, also known as Romex type NM-B cable, to enclosures and outlet boxes by pushing these grips into a knockout.. For technical drawings and 3-D models, click on a part number. You need to choose your fill table. It must be calculated as the largest ground wire that enters the electrical box. 2 GR20 for industrial or B20 for oilfield applications) . Light weight, compact and vibration proof design. Missouri Western University Mar 10, 2008 #1 Always wondered why a 3/8"NM romex clamp is called 3/8 nothing on it is 3/8 inch the mounting hole is 7/8" it fits 1/2" ironpipe thread the inside hole is 9/16" and the romex is 1/2" wide and not 3/8 thick I use them all the time but why are they not called what they are? RIGID CONDUIT AND KNOCKOUT SIZES. Non-Metallic (NM) Twin-Screw Clamp Connector ( 6) $310 Halex 1-1/2 in. 4 sch 80 pipe schedule. This fitting was designed to make your job easier by saving you time. Outside diameter 16 inches and below rounded . Drawing Installation Instructions. Commercial, Industrial, Residential Raceway Fittings. 336-15 7. Non-Metallic Fittings (NM) The Halex Non-Metallic category offers different options to connect Non-Metallic sheathed cable to a metal box or enclosure. NM cable connector zinc die-cast. . imperial strand conductor o.d. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges (please see top right figure - click to enlarge). cable size chart . Handles combinations of NM cable from #14 to #10. Superior Performance: Our compact Ranger cord connectors, available in steel, stainless, aluminum and non-metallic styles, provide twice the cable range with superior strain relief and a gland that restricts cable bending.. . Below is a chart of wire size for a given amperage: Wire Size: Amps: Wire Type: 3/0 Gauge: 200 Amps: Service entrance: 1/0 Gauge: 150 Amps: Service entrance and feeder wire: 3 Gauge: 100 Amps: Service entrance and feeder wire: 6 Gauge: 55 Amps: Feeder and large appliance wire: 8 Gauge: 40 Amps: High-strength designs for harsh environments. Sep 4, 2017. . Built in accordance with MIL-C-39012 and CECC 22110/111, SMA connectors can be mated with all connectors that meet these specification mating diameters regardless of manufacturer. From the above table, you can see that for NPS 2, Pipe ID is near to pipe NPS, and for NPS 14, pipe OD is the same as NPS. When calculating the available space you would allow for one 12 gauge wire for all three ground wires. Wire & Cable Tools & Equipment Power Management Lighting Electrical Components New Products. Features. Trade Size: 3/8" E-mail Product Information . Time Saver. : Ship Carton Qty. (f) The raceway is properly secured. This item: Sigma Electric C-500 NM/SE 3/8-Inch Clamp Type Connector, 100 Count $27.40 Gardner Bender PS-150 Plastic Staple, Inch., 14/2, 12/2, 10/2 (NM) Cable, Quick / Easy Installation, for Romex, UF, (NM) & More, 100 Pk., White $5.13 Southwire MSB22+ 1 Gang Device Box (22.5/Cu) with Depth Adjustable, Heavy Duty 42lb $3.86 nm cable clamp 71, Aug. 1976. The data in the chart do not ensure a guarantee of quality or a warrant characteristic of our products. Be sure that the clamp will meet or exceed the max amperage rating of the ground cable that it will be used with. *Types RHH, RHW, and RHW-2 without outer covering. Read down the first column on the fill table to find the wire gauge. Floor Boxes & Covers. Step 1: Open your NEC book to chapter 9. Non-Metallic (NM) Sheathed Cable Clamp Connectors ( 14) $698 Halex 3/8 in. Connectors for MC, Flex, and NM Cable is part of Topaz's "Essential Knowledge" series of training videos. New Products by Arlington . This guide does not address wire and cable evaluated only for suitability as factory-installed (See page E-9 for parts 8403 - 8410) Refer to pages C-14 and C-15 for complete cable ranges. Romex Brand SIMpull NM-B cable is designed for easier pulling, resulting in easier installation. Rigid Min Max Lbs. Wire Size for 60 Ampere Breaker. Most common is the Clamp Connector, available in 3/8" (1/2" knockout) up to 2". +2 Clamp type cable connectors terminate NM Cable or Flexible Cord to a 1/2-in knockout For one 14/2 - 10/3 NM Cable or .29-in - .45-in Flexible Cord (See NM Cable Sizes Chart in the image gallery for multiple cable configurations) Features a reversible locknut to preserve grounding Trade Size in Inches 3/8-in Package Quantity 10 OVERVIEW KL: indicates manufacturer (in this case Klauke) 22: Die set code (only for compression lugs DIN 46235) 12: Metric bolt size for connecting bolt: size M12 (12mm hole diameter) 150: Cross section of conductor in sqmm. Up to 3 NM cables at one time. Connector, Clamp Type, Two-Piece, Steel. ARTMARK Cat. (d) The raceway is sealed. For containment of 1000 volt and lower potential circuits. All household wires have a rating of at least 600V, so only amperage really matters when it comes to determining wire gauge. System of Measurement. Sigma Electric ProConnex 44660 NM/SE Clamp Type Connector 3/4-Inch, 3-Pack 99 3 offers from $8.84 Southwire 28828222 50' 12/2 with Ground Romex Brand SIMpull Residential Indoor Electrical Wire Type NM-B, Yellow, 50 Feet, Ft 3,278 17 offers from $49.10 What's in the box Sigma Electric ProConnex 49663 NM/SE Clamp Type Connector 1-Inch, 1-Pack NM CLAMP TYPE CONNECTORS Clamp Type Cable Connectors Die Cast Zinc Catalog # : 2711 Trade Size: Cable Size: Dimension A: Dimension B: Dimension C: Dimension D: Dimension E: Dimension F: Dimension G: Package Type: Std. Most NM-connectors are approved for securing only one or two cables, but there are connectors listed to handle even more. Cable with 8-gauge or larger wires has black sheathing (used for 40- to 60-amp circuits). Cord connectors prevent cable pullout and provide a tight seal against elemental damage. Non-Metallic (NM) Twin Screw Sheathed Cable Clamp Connectors ( 11) $548 Halex 2 in. Qty. 2 screw clamp type. Maximum Number of Compact Conductors in Electrical Nonmetallic Tubing (ENT) Using a Locknut Cable Clamp A locknut-type clamp is the classic metal cable clamp with a short, threaded cylinder and locknut on one end and a saddle-type clamp with two screws on the other end. Amphenol RF's N-Type connector features a threaded coupling mechanism and is fully interchangeable with N-Type connectors made to the MIL-C . 4 Sizes Available. Cable clamps should be evaluated for performance with the actual wire to be used. Order History. Available in galvanized, aluminized, or stainless steel to meet the specific needs of your vehicle. (1) UL Table NAE.3. E28474 LR49636 840 8400 8401 CATALOG . Next time you are in a store look at 1/2 rigid conduit. per 100 ACB38DCZ1 3/ 8" 14/2 - 10/2 50 9 ACB50DCZ1 1/ 2" 12/3 - 8/3 25 10 ACB75DC 3/ (3) Dimensions for trade sizes of 1/4 through 1-1/4 are from Table 20.2 of ANSI/UL 514-1978. 8412-8417 Cable Template; Charts and Guides. This is almost as bad as ground pin up or down! Strain Relief Connectors | McMaster-Carr. EZ-400-716M-X. Cable with 14-gauge wires has white sheathing (used for 15-amp circuits). Each #6 wire needs 5 cubic inches and each #8 needs 3 cubic inches. That is far too big for a 4x4 box. The cable must be secured as it enters the conduit and the conduit and metal box must be bonded. View Our Catalog. Pages created with Serif WebPlus. Inch. 6.2-8.5 Nm Battery cable bolt 60-96 in-lbs 6.8-10.9 Nm Voltage regulator locknuts 70-100 in-lbs 7.9-11.3 Nm Main 40 amp circuit breaker Keps nuts 20-35 in-lbs 2.3-4.0 Nm Battery hold-down clamp TORX bolt 15-20 ft-lbs 20-27 Nm Passing lamp bracket fork side TORX bolts 15-20 ft-lbs 20-27 Nm Passing lamp bracket fork side stud acorn nuts 72-108 in . Also available is a Snap-In version that comes in 3/8" (1/2" knockout) and 3/4". Flexible Metal Conduit (FMC) Combination Clamp Connector (5-Pack) ( 31) $563 /bag Halex 3/8 in. Metal boxes SHALL BE grounded with a separate machine threaded ground screw. and must be connected to junction boxes and the like with conduit connectors that secure to the tubing by means of a set screw or collet and nut; then the . We also utilized the 2014 NEC Chapter 9, Table 9 numbers for impedance and voltage drop calculations. Page: 1/161. For connectors that cost less and install faster, see page C-9. AutoCAD AutoCAD LT Autodesk Inventor CADKEY CATIA Mechanical Desktop Other Pro/Engineer SDRC I-DEAS SolidEdge SOLIDWORKS UniGraphics. 1/4. Available in Sizes: 3/ 8"-", ", & 1". Cable Ties. (2) Maximum Outside Diameter Per ANSI C80.1-1977. 71, Aug. 1976. Nylon products include durable cord grips that withstand continuous flexing and bending. 3/8. inch conductor o.d. UPC/Part Catalog Conduit Size Box Number Number EMT/Rigid Qty. 2-hour fire-rated RHH cable has ceramifiable insulation which has much larger diameters than other RHH wires. Allow users to contact me by email about models I contribute to 3DCC. into the panelboard. Available in brass and stainless steel with . (630) 833-0300. NM Cable Connector, Type: 2-Screw Clamp, 3/8 Inch, NM Cable Size: 14-2, 12-2, 12-3 AWG or (2) 14-2 AWG, Flex Cord Size: 0.300 - 0.560 Inch, Material: Zinc Die Cast. A 12-2 NM cable (2-wire) contains 2 insulated 12 AWG current carrying conductors (black and white) and a bare ground wire.A 14-3 NM cable (3-wire) contains 3 insulated 14 AWG current carrying conductors (black, red, white) and a bare ground wire.The 2 line wires are different phases (A and B) and share the neutral wire for return current. Non-metallic sheathed cable connectors CLAMP TYPE - ZINC DIE CAST Clamp type & grommets NON-METALLIC CABLE CONNECTOR - PLASTIC Applications: . TRADE SIZE. All cable jackets SHALL extend at least 1/4 inch into the box. We also allowed for up to a 5% voltage dropwhich some people might consider too high. AC/MC Selection Chart Catalog UPC Trade K.O. . Listed and marked for outdoor use. More devices require more cubic inches, as per tables of electrical box size given in this article series. Non-Metallic Twin Screw Clamp Connectors (100-Pack) ( 69) $5866 /box Get Everything You Need (18) The ampacity of Types NM, NMC, and NMS cable installed in cable tray shall be determined in accordance with 392.11. Mfr: Halex. Information taken from NEC Appendix C, Table C.2. Cable with 12-gauge wires has yellow sheathing (used for 20-amp circuits). Insert the cable into the knockout and slide it under the clamp. Good luck on your test. . Pre-Galvanized steel. All openings in boxes SHALL BE adequately closed. You can easily convert inch dimension to mm by multiplying it by 25.4 and rounding as follow; Outside diameter above 16 inches rounded to nearest 1 mm. Non-Metallic (NM) Twin-Screw Clamp Connector ( 6) $310 Halex 3/8 in. Quote: If all you're looking for is physical protection on the walls, 3/4" PVC is all you need. Assembly and maintenance are easy. UPC 751338195004. Mfr. Liquid Tight: Our cord connector design utilizes a neoprene bushing that produces liquid-tight installations.. Non-Metallic: Black Beauty cord connectors . Sigma ProConnex 1-in Die Cast Zinc Clamp-on Type Service Entrance Connector Conduit Fittings Item # 45362 Model # 49663 Shop Sigma ProConnex 166 +2 Clamp type cable connectors terminate NM or SE Cables to a 1-in knockout ACL Clamp Bolt Sizes by Size and Type. SKU M52591. Once the short circuit capacity of the system has been determined, choose the appropriate size cable. 7 DIE CAST 2 SCREW CONNECTORS . Classified, or Verified wire and cable (see Appendix A for designations). SIZE: DESCRIPTION: ITEM # 3/8" NON . mm metric strand nom. Cable Connectors For NM SE MCI MCIA AC cable. lbs. DIMENSION A. DIMENSION B. The cable jacket is color-coded for quick size identification; White - 14 AWG, Yellow - 12 AWG, Orange - 10 AWG, and Black - 8 AWG and 6 AWG. Electric signs and outdoor lighting over 1000 volts. c) Focuses on the information contained in UL Certified, Listed, Classified, or Verified wire and cable product markings (what the markings mean, where they may be located, etc.). Multiple ground wires are only considered to be one conductor. For Knockout Trade Size. The construction of the worm-drive housing on the band facilitates installation of a wide range of signs. Sizes 1/ 2 " thru 6" per proposed revision to NEMA Engineering Bulletin No. TC-400-716-MC. "Tool kit for LMR-400 crimp/clamp connectors (includes CCT-02, CST-400, CT-400/300, Tool Pouch)" Strip Tool. Connectors include three drive screws Robertson / Star / slot. Sizes 1/ 2 " thru 6" per proposed revision to NEMA Engineering Bulletin No. As an example you have a two 14 gauge and one 12 gauge ground wire in the electrical box. mikegp said: I just dremeled it out and it looks like it'll be fine. Bolt Size Nm (Dry) Nm (Lubricated) 5/16 UNC - 18: 11.2: 10.05: M8 x 1.25: 21.57: 19.09: M10 x 1.5: 42.17: 37.85: M12 x 1. . Supply that with #2 Cu or #1/0 Al wire or cable at 125A. Points 0.01. Quantities will fluctuate and do not reflect what we can acquire from supplier. Consult manufacturer's conduit fill tables. Dual gripping saddle clamps Saddle clamps ride up and down A on screw for ease of installation Tri combo head screw UL listed for MCAP/MCI-A & MCI-A HCF cables Applications To connect Flex, AC, and MC cables to a box or enclosure Standard Material Tubular steel Steel locknuts Standard Finish Zinc plated E148716 The configuration shown above, where a cluster of wires enters the top of the box through a single opening, is called a chase nipple. (b) The raceway doesn't penetrate a structural ceiling. 1 Sizes Available. On 2019-04-30 6 by lakelyn Non-Metallic Twin Screw Clamp Connectors (100-Pack) ( 69) $5866 /box ALL SIZES ARE INCHES . NEC sec. thereafter, and within 8 inches of a single gang non-metallic box without clamps. EZ-400-TM-RA-X. UPC: 051411051037. Mighty-Merge Multi-NM Cable Connectors and Transitions can help terminate up to 6 NM cables in one knockout or conduit run. Non Metallic Sheathed Cable Clamp Connector (Sizes) Twin-screw type Fits NM Cable: #6/3 to #2/3 AWG Flex cord .800 to 1.350 inches diameter or SE cable 3 conductor or 3#1/0 min; 3 conductor or 3#2/0 max Indoor use only To connect non-metallic sheathed cable to a steel outlet box or other metal enclosure Bolted Framing, Strut Fittings & Clamps. Specify the cable length, and the color of the jacket desired. Terminal Types . Manufacturer Topaze. Download FlEx Tubing Dimension PDF Seal rings are designed to be reusable and usually only one connector size is necessary for each pipe size. For our extension cord size chart calculations, we assumed 120V single phase with a power factor of 1. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50 . RGD - Rigid & Intermediate Metallic Conduit. Tighten the clamp's screw to secure the cable. No. SIZE: DESCRIPTION: ITEM # 1 1/2" NON-METALLIC CLAMP CONNECTOR: 05115: 2" NON-METALLIC CLAMP CONNECTOR: 05120: . Table 18 states that you cannot use NMD90 in a conduit. NEC sec. 1-1/4 in. nm clamp type connectors non-watertight two screws zinc die cast topaz unit ship wt/ cat # upc# size fits cable ctn case case 3/8" nm cable 120 10690 1/2" nm cable from 2#14 100 1000 50 to .64 max opening for oval nm cable 952 19500 3/4" oval nm 8-2 to 6-3 25 250 25 953 19510 1" oval nm 8-3 . Consult RK Rose+Krieger GmbH's entire Solid clamps - the aluminium tube connectors catalogue on DirectIndustry. 370-17a 9. It is a fast and easy way to pull NM-cables into a box, but not code approved. The Grayloc hub designation (e.g. Part Number: ST-400C-2 . Solid Clamps - Angle clamps Right . ACL Clamps use a variety of thread sizes which have been selected for the clamping force requirement of each size and style of clamp. 600 Volt Secondary Distribution. If you want to do it as planned, you will need a LARGE box. LQD - Liquid Tight Conduit. Conductor insulation is 90C-rated polyvinyl chloride (PVC), nylon jacketed. NEC sec. Our inventory of flexible cord connectors provides excellent strain relief and creates a secure connection, avoiding costly re-work. . Size . Nominal Size (inches) SH SSH . For steel and aluminum jacketed cables. DIN crimp cable lugs show the required number of crimps stipulated by the manufacturer: Marking "KL 22 12 - 150". Colour Hole Size Conductor Size RF-M Red 3, 3.5, 4, 5, 6, 8, 10, 12mm 0.25-1.5mm2 . caused by temperature fluctuations, and . 3.2. Drawing STEP File. Its applications are outlined in NEC 2008 and NEC 2011 Article 334. . 3/4. One-inch or 3/4-inch holes would be better. Zinc die-cast. Then you can feed whatever breakers the heater needs at the time you select it. Non-metallic sheathed NM-B cable is used in normally dry installations in residential wiring, as branch circuits for outlets, lighting and other residential loads. al hildenbrand Senior Member Locations: