Thomas and Betts FAQ s

Transcription

1 Question Do you need a bonding jumper with eccentric knockouts? What is the fire rating for Steel City boxes? Does Steel City offer a plenumrated box? The RS covers have tabs. How should these be used? What is the UL file number for steel boxes and covers? Can you mount a ceiling fan on the N? Are covers available for discontinued Thomas & Betts floor boxes? Can you install a steel floor box on or below grade? Is there a load rating that floor boxes must meet? How should the brass/aluminum carpet trims be installed? How many cables can you install in each pri-out on a non-metallic box? How do you secure the cable in a single-gang plastic box that has no clamp? What is the fire rating on Union non-metallic boxes? What is the UL file number of the non-metallic boxes? Which non-metallic boxes have the fire rating for shared firewalls without the use of putty pads? Thomas and Betts FAQ s Boxes & Covers Answer No, our boxes have passed the UL testing requirements. Two hours firewall/fire ceiling. Yes, SVT & SVT as well as covers 52-C-1-VT & 72-C-1-VT. For attachment of the device as required by the N.E.C. E2969. No, you must use a box that is UL listed for a ceiling fan (i.e CFB). Yes, for the 1900 series box. It comes in brass only; part number is 202-SC. Yes. According to the NEC, the floor box must have a corrosion-resistant finish if installed in this manner. Yes. UL requires floor boxes to meet a 300-pound load test. The brass/aluminum carpet trims are placed directly on the floor box. The covers are then put in place into the carpet trim. Take the one-inch screws provided with the carpet trim and put them through both the cover and trim and thread into the box. Two cables per pri-out in a single gang box, two gang or more it is one cable per pri-out. See NEC C. You install the NCCI-50 clamp in the thermoplastic soft box, or staple the cable within 8 of the box. Two hour firewall/fire ceiling. E The phenolic boxes can be used in a shared wall between apartments without the use of putty pads. May be installed within 3" of each other, but not back to back.

2 Question Are the natural nylon cable ties free of chloride, bromide, sulfate, fluoride and mercury? Are T&B cable ties manufactured with Halogen? Are halar cable ties plenum rated? Which of your cable ties are plenum rated? How can a user determine the type of tie that can be used with a specific chemical? Are T&B cable ties anti-static? Does T&B offer heat-stamped ties? Does T&B offer MIL-3367 listed ties? Are T&B cable ties NASA certified? Can I get replacement parts for cable tie tools? What is the bend radius of T&B grommeting? What is the application temperature for T&B acrylic and rubber adhesive mounting bases? What is the in use temperature for T&B acrylic and rubber adhesive mounting bases? What is the maximum load for T&B adhesive mounting bases? Cable Ties & Accessories Answer Yes. Chloride, bromide, sulfate, fluoride and mercury are not used in the production of the resin used in the production of natural cable ties. Typically, our cable ties are manufactured from non-halogen materials. For information on a specific tie, please contact Tech Support at Yes. Halar ties have the same UL listing as standard ties. Halar material is low-smoke and has good chemical resistance. All of our UL listed standard Ty-Rap brand cable ties are plenum rated. This includes the colored ties. The black weather resistant ties are not listed for plenum applications. The Catamount brand ties are not listed for plenum applications. There are chemical resistance tables in our Ty-Rap catalog designed to help a user decide what T&B cable tie will work best in their application. No. Yes. We offer heat-stamped ties in both our Ty-Rap and Catamount lines. There are minimum quantities required, special pricing for each order and a 8-10 week lead time for each order. Contact Tech Support at for additional assistance. Yes, we do offer MIL-3367 listed ties in both our Ty-Rap and Catamount lines. The Mil Spec numbers are listed in our catalogs with our qualified tie part numbers or you can contact Tech Support for additional assistance. Various products have at times been used in NASA-related applications. Yes, you can get replacement parts for T&B tools from our Tool Service Department by calling Acrylic: 65 degree to 120 degree F (18 to 49 degree C) and Rubber: 65 degree to 120 degree F (18 to 49 degree C) except for the quik-stick adhesive: 65 degree to 115 degree F (18 to 46 degree C). Acrylic: -20 degree to 212 degree F (-29 to 100 degree C) and Rubber: 0 degree to 150 degree F (-18 to 65 degree C) except for the quik-stick adhesive: 0 degree to 135 degree F (-18 to 55 degree C)..25 lbs.

3 The locking barb in the Ty-Rap cable ties is made from what material? What is the temperature range for the high-temperature cable ties? What is the flammability rating for Nylon 6.6? Are Ty-Rap cable ties RoHs compliant? Do we have any ties that do not require an installation tool? What material is in our detectable cable ties that makes the tie detectable? The locking barb is made of 316 stainless steel. The TYHT series temperature range is from -40 to 302 (-40 to 150C). UL94V-2 Yes, Ty-Rap cable ties are compliant with the European Directive 2002/95/EC, RoHs/2002/96/EC/WEEE. Yes, the TwistTail. This tie comes in 7,11, and 14 inch white and UV-Resistant Black nylon 6.6. Iron polymer and Barium Sulfate. Conduit & Cable Fittings Question What type of plating is used on T&B fittings? Are Steel City EMT compression fittings UL listed as raintight? Are your liquidtight fittings NEMA 3R, 4, 6 and 13 rated without a sealing ring? What material is the bushing made from in T&B cord grip connectors? What type of threads are used on the hub portion of T&B fittings? Can I purchase T&B fittings as components? Are T&B fittings Class 1, Div 2 approved? What material is used to manufacture diecast parts? Where are T&B fittings manufactured (country of origin)? Answer Our T&B fittings are electro-zinc plated with a blue chromate coating. Our Steel City line has an electro-zinc plated finish. Yes they are, Steel City series TC111A-RT (1/2") through TC116A-RT (2") Our liquidtight fittings are NEMA 3R, 4, 6 and 13 rated when installed with our 5262 series sealing rings. The 1/2 and 3/4 inch have a Geolast bushing, the 1 inch and larger are Neoprene. T&B liquidtight and cord grip fittings are manufactured with NPT threads on the hub side of the fitting. T&B liquidtight and cord grip fittings can be purchased as components. T&B liquidtight and cord grip fittings are approved for Class 1, Div 2 application only where general purpose equipment is approved - per NEC B. T&B die cast parts are made from Zamac 3 zinc. T&B fittings are made in several locations. Contact Tech Support for information on specific parts.

4 How can I check the temperature rating of a part? Are T&B cord grip fittings submersible? Can I mount T&B fittings vertically in a wet location? Does T&B offer a PG threaded cord grip connector? What is the torque requirement for a locknut? Please contact Tech Support for assistance in determining temperature ratings. T&B cord grip line has not been tested for underwater uses. Yes. T&B liquidtight or cord grip fittings can be mounted in the vertical position. Yes. Our product line includes the CC-PG and CC-ISO (non-metallic) threaded fittings. UL514B requires that the locknut be hand tightened and then further tightened with a screw driver and hammer 1/4 turn. What is the torque requirement for Torque requirements are noted in UL514B, table 15. the gland side of the fitting? T&B will check the sizes needed against our product How do I size a Star-Teck fitting? offering. The O.D. over the insulation and MC cable and the hub size are required. Can I get Star-Teck fittings in stainless Stainless steel is available. Brass is not offered. steel or brass? Can a Star-Teck fitting be buried in Star-Teck fittings are not approved for direct burial. concrete or earth? Can I buy Star-Teck connector No. Star Tek components are not sold separately. components? How much sealing compound is required for a seal? Is a sealing ring required when installing a Star-Teck connector in a punched hole? What is the difference between AC and MC conduit? What is the material used by T&B in EFC and LTC conduit? Can EFC tubing be used for robotic applications? What is the ASTM spec for the zinc STX and ST series fittings are supplied with product literature that notes the amount of compound that is required for each size fitting. If you know the fitting part number, Tech Support can check the amount of compound required. If you are using a STX and ST series fitting and require a NEMA 3R, 4 & 13 rating, our 5262 series sealing rings are required. The STE and STEX series have a built-in sealing ring that meets the NEMA 4, 4X and 6P requirements. AC cable is limited to four conductors, plus a ground wire. The wire size allowed is 14 AWG to 1 AWG; it also contains a 16 gauge bonding wire that is run within the armor jacket. MC cable is not limited to the number of conductors and is supplied in sizes from 18 AWG to 2000 MCM. LTC conduit and EFC tubing are manufactured with a rigid PVC helix and PVC outer jacket. It could be used in many robotic applications, but there are applications where the EFC tubing may not be suitable, please contact T&B Tech Support for further assistance. We use a ZAMAK 3 Zinc in the manufacture of our die

5 used in T&B fittings? Do your fittings meet UL514B requirement? Where can I find MSDS sheets for T&B products? What benefit does Dura-Plate provide me? Can I get T&B hubs in SST in sizes larger than 2"? What is the difference between a Form 7, a Form 8, and a Series 35 iron conduit body? Do T&B Conduit Body Covers interchange with the Crouse-Hinds Form 5 conduit bodies and the appleton Form 35 conduit bodies? Is LTA series Aluminum Liquidtight Conduit UL Listed? How much lighter is aluminum conduit as compared to steel conduit? Is the Thomas & Betts aluminum liquidtight conduit RoHS compliant? What is the outer jacket made from? If the outer jacket of the LTA series is made from PVC, what does it matter what the inner material is made from? Does any other manufacturer offer the entire system of aluminum liquidtight fittings and conduit? cast fittings. The majority of our fittings meet UL514B, but there are cases in which we offer products that UL does not rate. MSDS sheets are available through our web site. There are products that are covered by Articles that do not require an MSDS sheet. The Dura-Plate finish provides a greater resistance to corrosion and meets or exceeds ASTM B117 salt spray test requirements. We only offer the T&B hub in stainless steel in the 1/2 to 2" sizes. There are primarily 2 differences between each of these fittings. These pertain to the mounting of the cover, and the size of the fitting. Yes, they are UL interchangeable with both. LTA Aluminum liquidtight conduit is not UL listed. Aluminum conduit weighs about 37% less than it's steel counterpart. Yes. The outer jacket of the LTA aluminum liquidtight conduit series is made from PVC. Excellent against corrosion resistance. All conduit systems breath, and in general are not hermetically sealed. Corrosion in the form of vapors, and condensation can penetrate into steel jacketed liquidtight conduit. This would not be a concern with the LTA series offered by T&B. No. There are manufacturers that make aluminum fittings, and there are others that make conduit however, no one other than Thomas & Betts offers both.

6 Terminals, Lugs, Connectors, Markers & Heatshrink Question Can aluminum conductors be used for HPS style split bolts? When should two bolts be used instead of split bolts? What torque requirements are recommended on T&B bolted products? What advantages do bolted connections have over compression connectors? Does T&B offer tooling for crimping connectors? What is the gauging of a die? Does T&B offer tool repair parts? Can a T&B tool be used to crimp a competitors' lugs? Can other manufacturers' tools be used on T&B lugs? What type of T&B crimps does T&B Tools offer? Can special flex wire sizes be used in T&B connectors? Will T&B certify to customer specifications? What material is used to make Dragon Tooth connectors? Can Dragon Tooth connectors be used for either aluminum or copper conductors? Are Dragon Tooth connectors UL Answer Yes. They can be used for applications not requiring a listing, such as utility applications. Where UL listing is required, the recommended product is the APS series. Two bolts should be used in applications where a more secure connection is required. The two bolts provide greater clamping force for high mechanical stress applications such as vibration. Torque requirements are typically determined by the listing agency such as UL or by standards written by ANSI, NEMA, etc. Manufacturer's test and recommend products consistent with these standards and listing agencies. Bolted connectors eliminate costly tooling and are generally more massive than a comparable compression fitting. A bolted connector can be reused and retightened. Yes. T&B offers a broad variety of hand tools, hydraulic tools and battery operated tools for connectors. Gauges are used to assure calibration. T&B Tool Service can supply gauges. Yes. Please conact T&B Tool Service for assistance. T&B's tools are specifically designed for use with T&B connectors. There are some products that have been tested and listed with UL and CSA. Please contact Tech Support for more information T&B hand tools offer a "Diamond or Box" crimp. T&B hydraulic tools are supplied with individual dies that use a "hex" shape, as well as "rounding" dies for high voltage connectors. T&B also offers an "indent" crimp in our (Smart Tools), both in hand pump self-contained and remote hydraulic head. Many different flexible strand wires have been tested in T&B connectors. If the wire stranding you are using is not listed in our catalog, please contact Tech Service for review. If it has not been tested, it may be possible to test and list your wire with our connectors. T&B certifies its high-quality products. Products are not manufactured to customer specifications. T&B's insulation-piercing Dragon Tooth connectors are made from copper. Yes. Yes.

7 listed? Do you have to strip the varnishtype insulation from the magnet No. wire before crimping? Who uses Dragon Tooth connectors? Primarily electric motor and transformer manufacturers. Can you use either stranded or solid wire with Dragon Tooth connectors? Yes. How do you match a connector with It is based upon the circular mil area of the conductor. a particular wire size? For rectangular wire, the formula is as follows: Width X Height X How is the circular mil calculated? 1.273x106. For round wire, it is based upon the gauge. What is the purpose of the Dragon Tooth design? What types of connectors are available for a specific magnet wire? What type of tooling is available for these magnet wire connectors? Can magnet wire connectors be used on steel wire? What type of testing has been done for magnet wire connectors? Explain how various magnet wire combinations are used? What is the shrink ratio for thin-wall tubing? What is the difference between CMP and CPO series tubing? Does T&B's thin-wall heat shrink meet the requirements of MIL /5? How many feet come in a bulk reel of thin-wall tubing? Does T&B's thin-wall tubing come supplied with an adhesive lining? Does T&B offer thin-wall in specialcut lengths? Is T&B's thin-wall tubing considered flame-retardant? What is the voltage rating for heat shrinkable products? To pierce through the magnet wire's insulation without stripping the insulation from the wire. We offer ring tongue, fork tongue, quick disconnects and parallel splices. We offer hand tooling, battery operated, air hydraulic and hydraulic. No. The magnet wire connectors are designed to work with aluminum and copper wire only. T&B does 180 degree current cycling test and tensile strength test. Our Magnet Wire connectors are designed to work with specific circular mil area of wire combinations. Different combinations of magnet wire can be used in most casesin a particular connector as long as the listed wire combination is not exceeded based on the maximum circular mil area noted. 2:1 Shrink Ratio. No difference in material; it is strictly a packaging difference. Yes. It depends on the diameter of the tubing: 1/16 to 1/4 = 1000 ft; 3/8 = 500 ft; 1/2 = 400 ft; 3/4"" to 1"" = 300 ft." Standard thin-wall is non-adhesive. Yes, contact Tech Support. Yes. 600 volts.

8 Does T&B offer heavy-wall tubing in various colors? Is the heavy-wall tubing rated for direct burial? What is the temperature rating for your Sta-Kon terminals? Do we offer terminals with a higher temperature rating? What is the material of our terminals? Do we offer any other types of finishes? Do our terminals meet with any milspecs? Are any of your terminals, splices or disconnects UL listed for multiple wires? Are your terminals, splices, and disconnects listed for stranded and solid wire? Are our splices and flag terminals available on Mylar tape? Do we have a CE rating for our terminals, splices and disconnects? Can we use other manufacturer's tools with Sta-Kon terminals, splices and disconnects? Can you use the TBM25S on Sta-Kon terminals? Is AMP, Molex and Spec-Kon's Only Black and Red. Yes. Nylon insulated and vinyl insulated terminals are rated at 105 degree C (221 degree F). Tefzel insulated terminals are rated at 150 degree C (302 degree F). Non-insulated terminals with standard plating are rated at 150 degree C (302 degree F) We do on the non-insulated terminals and disconnects. We offer different types of plating which can increase the temperature rating up to 260 degree C (500 degree F). Our terminals are made of copper alloy with an Electro-tin plating. Yes. On non-insulated terminals, splices and disconnects we offer (in bulk packages) nickel plating (NP), gold plating (GP), silver plating (SP) and plain finish or not plated (PF). Just add the corresponding suffix to the end of any "bulk" part number... i.e. C71NP. Yes. We are currently on the QPL MIL-T-7928, under designation series MS17143-XX, MS20659-XXX, MS21004-XX and MS XXX. Some of these parts are listed in the back of the Sta-Kon catalog. Contact Tech Support for more information. Some of them are. We currently have multiple wire listings for vinyl-insulated ring and fork terminals RA, RB and RC series. We also have some listings for nylon insulated rings as well as our RAA and RBB series splices. We do not currently have multiple wire listings on our disconnects. You can use both stranded or solid wire on our insulated rings and forks from #26AWG up to #10AWG, our non-insulated rings and forks from #22AWG up to #8AWG, and splices up to #10AWG. Our disconnects are for stranded wire only. No. No. According to the European Commission in their "Guidelines on the Application of Council Directive 73/23/eec" -- July, 1997, application of the CE Mark to many electrical or electronic components is not necessary. Even where applicable under one or more Directives, only products placed on the European market themselves are required to carry a CE Mark. No. When crimping Sta-Kon terminals, splices or disconnects the only tested and UL listed tools are Sta-Kon tools. No, the TBM25S is for Color-Keyed lugs only. We do offer a similar hand tool for larger Sta-Kon's -- part number ERG2008. No.

9 autofeed tool compatible with Sta- Kon terminals on mylar tape? Are T&B crimp terminals available in bulk package quantities? What is the amperage rating for our terminals, splices and disconnects? Where on the barrel of the terminal should the indent be made when crimping Sta-Kon terminals? Can I use my T&B Sta-Kon tooling on Catamount terminals? What is the number of cuts or crimps I can get from a fully charged battery? What is the overall life of a battery? How can I tell when a compression is complete? Can a T&B cutter be overloaded when cutting? How can I release the jaw if it hangs up after a connection or cut is Yes, our Spec-Kon product line offers the equivalent items in bulk package quantities. Our terminals are tested and listed to the requirements of UL486A. The basis of this testing requirement is that the connector shall run cooler than the listed conductor. Since the connector is running cooler than the conductor, the limiting factor is the temperature restraints on the conductor. The performance of T&B Sta-Kon terminals is not hindered when crimpedin any radial position on the wire barrel. The crimp indenture can be located on the seam of our brazed terminals, on the backside of the barrel of all terminals, or on the topside of the barrel of all terminals. You can use the WT112M and WT2000. It depends on the size and type of cable being compressed or cut. We have noted there are many variables that determine the number of cycles. Our product catalog has crimping or cutting estimates listed to use as a guideline. Some variables include: Ram travel-stroke; type of material being cut or compressed - Cu, Al, Steel, rebar, etc.; Size of material being cut or compressed; Outside temperature; Weather conditions; Battery condition. Users can increase battery life cycle by allowing the tool to rest in between a series of cuts or crimps. Both CRCTBPEI and CRCTBP can be recharged approximately times, which may vary depending on recharging frequency. Proper maintenance will give you the maximum number of recharge cycles. The CRCTBPI has an indicator on its side that will give you a reading on the number of recharge cycles. The CRCTBPI indicator circuit has a 1 year guarantee and all batteries have a 5 year guarantee. T&B can analyze and condition any battery suspected to be losing capacity, simply return it to us for a FREE evaluation. All T&B Battery powered tools have a by-pass cartridge that relieves pressure when maximum output is reached. This is noted by a series of audible "clicks" followed by the tool running in "neutral" mode. The tool cannot be cycled again until the ram is released. It is not necessary to fully retract the ram. This will save on battery cycle life when crimping smaller wire. Yes! Although the cutters are equipped with a by-pass cartridge, the blades are susceptible to damage when cutting materials other than those specified. However, the tools' hydraulic circuit will be protected from overload by a pop-out overload button. Wait 15 seconds and reset by pushing it in. In both cases, the release mechanism must be activated. Once it's activated, continue to hold this position to assure the return

10 made? If the tool jaws are fully advanced and will not retract, how can I tell if the release mechanism is working? Can I release the tool if the battery fails and I don't have a spare battery available? What will happen if I drop the tool? How difficult are the battery power tools to repair? What does the red LED indication on the side mean while activating the tool? oil port is open and at the same time carefully pry the jaws apart. The pistol style, or double trigger tools, (TBM6BSCR/TBM58BSCT) have a mechanical release trigger which can be activated at any time during the cycle. It may be hard to depress if fluid pressure has built up and has not yet bypassed. In this case, pull trigger with both hands or reactivate the tool until the by-pass is achieved. Recheck trigger release and it should easily be depressed. If jaws will still not retract, refer to the previous question. The push button tool, TBM14BSCR, utilizes an electrical retract mechanism which can be activated anytime during cycling. If you can hear it function, then the return port is open and there should be no pressure at the tool jaw. Remember to hold this button while freeing the jaw as described above. Yes! (Remember that this only applies to the electrically released tools). The tool pressure can be released by unscrewing the center 4 mm hex screw located on the bypass cartridge at the top of the TBM14BSCR. Remove the rubber plug, insert a 4 mm hex wrench and unscrew until the ram retracts. Once released, you must contact our service department to reset the pressure using a pressure gauge. The pistol style tools do not need a battery to release since they utilize a mechanical lever and can be released at any time. The tool housings are made of high impact plastic and have been designed to handle waist high drops. Case damage may still occur depending on the impact angle. At this height the internal components should not be affected. A new housing and labels are available at a minimal cost. All BATTPACs come with a shoulder harness or carrying strap and should be used while lifting the tool to help avoid drops that may damage the unit. We do not recommend that you attempt to repair the tools unless you have T&B factory training. Putting the internal components into the housing is difficult because you must route wire, fit small springs and trigger components, and properly align all pieces for an exact fit. Components may be damage if they are installed incorrectly and the tool will not function properly. Servicing these tools by anyone other than authorized repair centers may void manufacturers warranty. We recommend factory service until proper repair training is obtained. The display lights when the battery has passed the 75% depletion level. The LED display will light when the trigger is depressed to indicate the battery is almost spent. It may also light when the cut or compression reaches the top cycle. The flashing display serves as a reminder to have a spare battery on hand. Continue to operate the tool until it does not respond to the pull of the trigger. Remember to let the battery cool before

11 How can I tell if the batteries are charged? Can the BATTPAC be used on energized cables? Can battery powered tools be insulated? Do extreme hot or cold temperatures have any effects on the battery powered tools? Do the Power Distribution Blocks meet the DIN rail mounting standard? What is the maximum operating temperature for Power Distribution Blocks? Do the Terminal and Tap Power Distribution Blocks contain any lead? Do the Terminal and Tap Power Distribution Blocks meet "finger safe" requirements? Are the new Power Distribution Blocks available in both DIN rail mountable and "back pan" screw mountings? Can the Power Distribution Blocks charging. The chargers LED display will go out indicating a full charge on the CRCTDC 12V DC charger. The CRCTQC 15 minute quick charger will show an orange LED display indicating a full charge. The new CRCTBPI "SMART" battery is now available and has an LED circuit that will readily indicate the percentage of charge while in use or by depressing the "check" button. All tools can be used on energized cables without harming the internal circuitry. They have been tested up to 50 KV, however, if the tools are grounded or touch other electrical phases on high voltage lines, they would be destroyed. Caution must be paramount when using any product around energized cable. Always adhere to your company's procedure. Yes! T&B can supply these tools with a dipped head to protect from "brush" contact while in use. We use a double stage process that is rated at 1000V, and can be installed on all compression heads. Precautions should be taken to avoid grounding conditions. Yes! Although these tools are designed to be used in all types of weather conditions, extreme hot or cold temperatures will effect tool performance. Extremely hot temperatures, above 110 degrees F will cause the battery to heat up rapidly and may reduce crimping cycles. It may also increase cycle times caused by thinning hydraulic fluid at these temperatures. Extremely cold temperatures, below -10 degrees F will cause the hydraulic fluid to be thicker, and related components to slow causing reduced cycles. Prior to using the tools in these cold temperatures, it is recommended to allow the tool to warm to room temperature for optimal performance. Yes, Blackburn PDB's are suitable for both DIN and high DIN 35 rails. 80 degrees Celcius No. The blocks are Rohs compliant and also meet requirements of California Proposition 65. Yes, IEC 529 with IP-20 grade finger-safe protection. Yes - and for many sizes, both features are incorporated into the design. Yes, the new distribution blocks are aluminum extrusions that

12 be used for both Copper and Aluminum Conductors? Will the Power Distributon Blocks have UL approval and listing? What kind of tools are required for installation of Power Distribution Blocks? What do the different colors represent, i.e. Grey, Green and Yellow, and Blue and Grey? can be used with both copper and aluminum conductors and are pre-filled with oxide inhibitor to keep conductor materials from oxidizing. Yes, UL Standard 1059 category XCFR2, file E All installers will have a full complement of tools required for these installations. Allen (hex) wrenches are used to drive high quality fine threaded screws to achieve the required tightening torque. Although the blocks cand be used interchangeably, the following key designates the application: Grey: Power Circuit Green and Yellow: Grounding Circuit Blue and Grey: Neutral Circuit