what is a transclosure. 000006Transclosure or plug in building Fiber Optic across yard Breaker Control Cabinet Hard Fiber Brick wires direct to Breaker Control Cabinet Gateway Panel Gateway for SCADA Function, Fault Record Retrieval, Automation Relay Panel as Appropriate Test Panel IEC 61850-9-2 Brick-Based Optional DesignSubstation transforms voltage from high to low or from low to high as necessary. what is a transclosure

 
 000006Transclosure or plug in building Fiber Optic across yard Breaker Control Cabinet Hard Fiber Brick wires direct to Breaker Control Cabinet Gateway Panel Gateway for SCADA Function, Fault Record Retrieval, Automation Relay Panel as Appropriate Test Panel IEC 61850-9-2 Brick-Based Optional DesignSubstation transforms voltage from high to low or from low to high as necessarywhat is a transclosure Design criteria for room ventilation

Serving the growing needs of our nation’s utility companies Meeting demand. H의 노드는 G와 동일하지만, H에는 추가 간선이 포함됩니다. g. The current implementation of augmentation doesn't preserve the facts that are already true in the model that is being augmented. sas. For multigraphs with multiple edges between the same two nodes, the output graph. SAS® Visual Data Mining and Machine Learning 8. Home; About Us; Products. What is PM transformer? Eaton’s Cooper Power Systems manufactures a complete line of single-phase pad-mounted distribution transformers. < $45,392. It is important to label the phase-to-ground voltage because choosing the wrong value can result in damage to. 009 - Scientific, nautical, surveying, electric, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash. sas. Hinged screw cover. Applications: Used where higher-amperage power is needed in conjunction with a disconnect. It offers advanced features such as coordination, protection, and programmability. This paper presents how transitive closures and their instantiations for all possible types of db interesting functions and function products are computed by the MatBase Datalog¬ subsystem. This paper presents how transitive closures and their instantiations for all possible types of db interesting functions and function products are computed by the MatBase Datalog¬ subsystem. See full list on csemag. Call 1-866-527-SAVE and indicate that you are interested in enhanced incentives. Sometimes you have to do better than "what the boss wants. Para capacidades mayores consultar con la C. Skew Symmetric Matrix. Enhanced Incentives. *go to Ncees website and get the practice test (it is computer based now, but the offer one that they will grade for you. the conduction of soluble material (such as metabolic products) from one part of a plant to another. . comtransclosure. The table above showcases the price range offered by different suppliers. 8ec33928b154d90a. SAS Optimization 8. As the problem progresses, the vehicle may shake while. SAS® Optimization: The OPTNETWORK Procedure documentation. These power transfer hinges provide a concealed, vandal-resistant way to run wires from the door frame to doors equipped with exit devices and electric locks. the vertical mounting centers for rails in Transclosure® housings and other enclosures. $2,786. Standard features • Meet or exceeds ANSI®, IEEE® and NEMA® standards • Meets DOE Energy Efficiency Standard 10 CFR Part 431 for distribution transformers • Tank coating exceeds IEEE Std C57. Mark Davis (Phone: 423-559-7581) Asset Location. To view the entire AC and the latest errata. Finally, I tried to install again pggb via mamba instead of. Transmission Substation. Given the transitive closure of , you can. printf "Definition %s := %s. NEC 2017 introduced the new first level subdivision 110. . S. Since the definition of the given relation uses the equality relation (which is itself reflexive, symmetric, and transitive), we get that the given relation is also reflexive, symmetric, and transitive pretty much for free. Here are some steps you can take to help you trace where that humming or buzzing sound is coming from. above ground enclusure products come in a multitude of styles, sizes and material composition so you can select the best fit for your application. sas. Combo Disconnect Cabinets. . Sectionalizing Cabinet, Three Phase, Fiberglass, Munsell Green, 58"W x 25"D x 42"H, Sliding Parking Stands - AboveLooking for Flyers, Brochures, Catalogs, Product Selector Guides & More?A padmount or pad-mounted transformer is a ground-mounted electric power distribution transformer in a locked steel cabinet mounted on a concrete pad. The 5052 alloy provides good welding characteristics and is. = transclosure (G) returns the transitive closure of graph G as a new graph, H. Compare. The rest were gifted. The output data set Cycles contains any circular dependencies, and the data set TransClosure contains the transitive closure . SAS® OPTGRAPH Procedure: Graph Algorithms and Network Analysis documentation. A classic underground residential distribution circuit is an underground circuit in a loop arrangement fed at each end from an overhead circuit (see Figure 1). com. S. gov). Deadbreak Apparatus Connectors Functional Specification Guide T-OP II Deadbreak Connector PS650007EN 1 of 2 • October 2016 • Supersedes October 2013 (G600-12-1)SAS® Visual Data Mining and Machine Learning: The NETWORK Procedure documentation. Padmount Transformer. . sas. These are complete PV solar power systems that can work for a home or business, with just about everything you need to get the system up and running quickly. TheThe T9 Series is our most technologically advanced series of cylindrical connectors available. A padmount transformer is a ground-mounted utility distribution transformer, which usually is housed in a locked metal cabinet, situated on a small concrete pad. Loud or intrusive electrical buzzing sounds. ) Height (in. True. Introduction . Command terminated by signal 6. Lineman. . Occasional Contributor III. Both Tmax and Tmin satisfy associativity. October 1, 2020 . Each of the above ct cabinet types come in different sizes depending on the intended application. Operating status is easily confirmed through visible gaps and grounds. a. SAS Optimization 8. See examples of ELECTRICAL used in a sentence. What Are Electrical Utility Cabinets? “ Utility cabinet ” is a very broad term, covering all types of housing for electrical systems components. Instead, we compute them using the dynamical programming approach similar to the Bellman-Ford algorithm for Figure 4-1: Transclosure and davit pole installation in median Figure 4-2: Transclosure installation improved with community-oriented art Figure 4-3: Milwaukee Harp Luminaire Lighting The City of Milwaukee owns and operates a unique electrical system that is divided into roughly two equal halves. In a wiki context, it is the use of the template functionality of MediaWiki to include the same content in multiple documents without having to edit those documents separately. Saved searches Use saved searches to filter your results more quickly At the southern end, 885 will begin as a toll road at N. Statistically speaking you don’t make near that now. Prints the Transitive Closure of a given Graph. Otherwise, it is equal to 0. 1 M3801 Material Standard for Precast Pads and Covers 5. . data LinkSetIn; input from $ to $ @@; datalines; B C B D C B D A D C ; The following statements calculate the transitive closure and output the results in the data set TransClosure: . Elastimold™ medium voltage switchgear uses vacuum interruption with molded EPDM rubber solid dielectric insulation, based on technology that’s been field-proven in electrical distribution systems for more than 50 years. 25 miles of highway will connect the Durham Freeway with U. NEC 2017 introduced the new first level subdivision 110. David and Susan developed evidence that showed that skilled electricians had been on-site numerous times before. 6 KVA. These can be attached to underground single or three phase lines. Delivery information is determined by your default shipping zip code/postal code (can be changed in checkout), order cutoff time and our. For the purposes of aluminum enclosure manufacturing, Nema Enclosures specializes in using 5000 series aluminum for sheet material and the 6000 series material for extruded angle and flat bar. . Can be subsurface. 5 Computing transitive closure of a weighted graph Computing maximal transitive affinity hij by its original definition Eq. Study with Quizlet and memorize flashcards containing terms like true or false: URD systems are most often fed from overhead primary distribution lines through termination often called risers, when a large customer of three phase power is associated with a URD system, the system may be fed directly from a ______ through an underground feeder. A blank protects a URD system from over voltages. comMATLAB ( Mat rix Lab oratory) is a programming environment for algorithm development, data analysis, visualization, and numerical computation, developed by MathWorks. xml ¢ ( Ä–Mk 1 †ï…ü‡E×à•“C)Åë ú ¹¤ ¦Ð«,ÍÚ¢úB 'ñ¿ïì'%µ³K Ñ‹aW3Ïû¬Ö+fuólMñ 1iï*vU. docx from SYSM 6306 at University of Texas, Dallas. translocation: [noun] the act, process, or an instance of changing location or position: such as. False. The open-delta PT is commonly used in medium-voltage (MV) generator paralleling switchgear among other applications. If there is a path from node i to node j in G, then there is an edge between node i and node j in H. by LindseyStone. data LinkSetIn; input from $ to $ @@; datalines; B C B D C B D A D C ; The following statements calculate the transitive closure and output the results in the data set TransClosure: . com or contact the Electric Service Support Center: Electric Service Support Center Monday – Friday 7:00. Given the transitive closure of , you can. For unrebated residential doors. Liftoff cover enclosure. 16 (B) Service Equipment. substation subdivision switch yard feeder buss. Our comprehensive packaged solutions capability includes engineering a protection and control and/or automation system, real-time digital simulation (RTDS) studies, design and supply of a Substation Controls in a Box or a. SAS® Optimization: The OPTNETWORK Procedure documentation. More common is critical loads being wired with three single phase transformers in a. Meta. 754/759the vertical mounting centers for rails in Transclosure® housings and other enclosures. comTRANSCLOSURE CABINET (WHEN REQ'D) TO CUSTOMER SWITCHGEAR INCOMING 4, 13. Contribute to MalithaLiyanage/TransClosure development by creating an account on GitHub. Secondary URD cable always has at least two conductors. sas. The car shifts fine and is quiet in park, reverse and drive. In-Line Connectors - Medium Voltage Underground Installation Video of Straight (In-Line) and "Y" Type ConnectorsCurry is a programming language that integrates functional and logic programming. Aug 23, 2012. What devices accommodate low break and elbows? Parking stand. See examples of ELECTRICAL used in a sentence. removing explicit mode transitions) are causing some output issues when executing explore mode commands. Transitive closure. Utility cabinets as a species may be indoor or outdoor, large, fridge size housings, or small, portable junction boxes. front of the enclosure. Another problem is your relations are not reflexive, but you need reflexivity to get singleton equivalence sets. a variation graph inducer. Here are just a few of the potential issues: Your outlet timer is making noise. View Products. sas. org> Date: Fri, 06 Oct 2023 01:59:17 UTC Fri,. Cette these presente une formalisation en Coq des langages et des algorithmes fondamentaux portant sur les bases de donnees. . Load your own part numbers, pictures, and descriptions. successors (TG, u) % list of reachable nodes. Hi everybody! I have a 2002 Saturn SL2 with automatic transmission. Enclosure NEMA 3R, Screw Cover, 16 Inch x 16 Inch x 6 Inch, No Knockouts, Steel/Gray Powder Coat. The RMR ® Fixed Wall-Mount Enclosure protects equipment with cutting-edge sealing technology and certified ingress protection ratings. Learn more about. Trembling, Grinding, or Jerking. The 5052 alloy provides good welding characteristics and is. r/Lineman. corporate office 13131 west little york road houston, tx 77041 phone: (713) 466-0277 (800) 231-1412 facsimile: (713) 896-5226225 kVA Pad Mount Transformer - 12470V Delta Primary - 208Y/120 Wye-N Secondary - Oil Cooled - N3RStudy Chapter 5: Conductor Identification, Switch Control of Lighting Circuits, Bonding and Grounding of Wiring Devices, and Induction Heating flashcards. Sicame - Low Voltage Overhead Products - TTD0510XF - TTD0810XF - TTD1010FBTUNI - TTD1510FT - TTD1810XFBTUNI -. As mentioned above, automatic transmission failure usually starts with hesitation while shifting gears. information & requirements for electric service customers electricians architects engineers builders inspectors i n f o r m a t i o n & r e q u i r e m e n t s f o r e l e c t r i c s e r v Based on the construction and installation of switchgear, electric substations are of two types. Open delta transformers are rare and are typically only used for small loads where cost is important. First-hand confirmations aside, if I can make 180k as a utility JL in Arizona, at Arizona wages (quite a bit less than California wages), with far less overtime hours, no per-diem… shouldn’t be too unbelievable. Description. T9 connectors can accommodate the highest density of contacts in one connector and feature the most comprehensive selection of contacts available, including fiber optic, twinax, coax, quadrax, and PC tail contacts. 100 years of porcelain insulators- 1892-1992. CAS Action Programming with CASL, Lua, and Python . Map to this location. 0 Connection, 100% Screw-less, Aluminum Body with fast shipping and top-rated customer service. The nodes in H are the same as those in G, but H has additional edges. Enclosure NEMA 3R, Screw Cover, 16" x 16" x 6", No KOs, Steel. 1), so wfmash was installed automatically as a dependency of pggb. 3: Mathematical Optimization Procedures documentation. 4 Eversource NH Information Requirements 2021 To initiate a work request, check on the status of an existing request, and additional electrical service information; including meter socket pick up locations,Eversource Energy . Compared to a grounded-wye arrangement the open-delta PT only requires two. These enclosures are suitable for low voltage splicing or cable termination from the secondary side of a utility’s transformer for multiple service feeds. enclosures overview Robust construction, made of high grade sheet steel protecting against mechanical impact Surface corrosion protection throughtransformer transclosure cabinets typical transclosure installation ferroresonance prevention floating wye - delta customer supplied outdoor above ground vault floating wye - delta vault layout (1500 kva max) grounding for grounded wye - grounded wye bank with dead top large two transformer vault 5000 kva max vault secondary busIm a 2nd year electrical apprentice so it would be way easier to finish out these next two years and transfer rather then restarting. Keeping all production processes in-house gives us control over the quality of materials, the. 70, where the Cheek Road. One graph is given, we have to find a vertex v which is reachable from another vertex u, for all vertex pairs (u, v). This is most likely due to the generation of th. If you have edge properties that are in the same order as s and t, use the syntax G = digraph(s,t,EdgeTable) to pass in the edge. com Enclosures - Above Ground Hubbell Power Systems, Inc. To identify the chains, you can use PROC SQL to identify those links in that are not in . comSAS Optimization 8. Design criteria for room ventilation. There is a ground rod at every transformer. SAS Visual Data Mining and Machine Learning 8. Durham breaks ground in Buffalo, MO. Copper Grounding Conductor. The 1. Disclosure, originally subtitled Disclosure: Trans Lives on Screen, is a 2020 American documentary film directed and produced by Sam Feder. True or False. ) is a manufacturing company specializes in low, medium and high voltage electrical equipment. Analytic Store Scoring Action SetTransitive Closure it the reachability matrix to reach from vertex u to vertex v of a graph. proc optmodel; set<str,str> LINKS; read data LinkSetIn into LINKS=[from to]; set<str,str>. Cabinets with provisions can be built in single or dual configurations. , Using one of the architectural drawings, determine which elevation shows the exterior roll-up door and personnel entrance doors into. • Matrix path k is defined such that path k[i][j] is true if and only if there is path from nodeSome of the latest changes to the REPL (i. As you might guess, transclosure is a portmanteau of transition and enclosure. Daelim Electric offers utility pole transformers priced between $3,000 and $7,000, while the electric pole. Pad mounted termination enclosures, Three-Phase, NEMA 3R (rain-proof), 600 Volt Rated. A classic underground residential distribution circuit is an underground circuit in a loop arrangement fed at each end from an overhead circuit (see Figure 1). Prescriptive easements often arise when rural land is being used by, say, a. I know a lot you can do. The notes and questions for Asymptotic Complexity - PPT, CS10001: Programming and Data Structures, Engg , Sem have been prepared according to the exam syllabus. 9 in build. –Hey Everyone!I've been hoping to come across a transclosure at some point during my travels, I think this might be the closest I'll get. . Primary and secondary voltage 3. . They are rated up to 600V and are available from 800A-4000A. Etc. If there is a path from node i to node j in G, then there is an edge between node i and node j in H. Transclude definition: Institute a programming step of substituting a template or other input for its rendered text, such as when parsing wikitext. The device is often used on babies and adults and avoids open-heart surgery. . Combo Options: Breaker or fuse pullout (available at 400 Amps) Breaker Combos: Single 400–1200 Amps or 2/200 Amps breakers. Use this information and our catalog as a guide but know that we can produce whatever variation to suit your company's needs. These cabinets form very useful parts of any power management system. Your fuse box is buzzing. Underground models can provide watertight protection and help protect electrical cables and devices from frost, rust, and weather. Industrial Metal & Control Inc. Report on . s and t can specify node indices or node names. Overview. If there is a path from node i to node j in G, then there is an edge between node i and node j in H. 2450 Guthrie Ave NW. • 17 days ago. NEWS: Transmission and Distribution Magazine has highlighted our TTDC connector line with the article Spacer Systems Get a New Connector - A new insulation piercing connector is created through a research and development program, followed by utility trials. You can do a lot to pad your résumé. If this locus is within some kind of threshold distance of the gene encoding protein X, perhaps 2Mb, then it is known as a 'cis' ('on the same side as'). fa input. proc optnet graph_direction = directed data_links = LinkSetIn; transitive_closure out =. Isolation Transformer 150 kVA • Single Phase • Primary: 208 Volt • Secondary: 120/240 Volt. 15s user 0. sas. Schneider Electric USA. Eversource | NH Information & Requirements 2021 Contact Us To initiate a work request, check on the status of an existing request, and additional electrical service information; including meter socket pick up locations, please visit us at eversource. Since all of the live contact points are enclosed in a grounded metal box, this. Enclosures. If you qualify for the Income Eligible Program, you can find the agency serving your area by clicking here. ) Mount holesSD300, MD300. Flexibility with one or two-door design, open bottom, and no center post, with overlapping door for added rigidity. Because I want to used this function to sort my data so I transfer it to my data type (My data is an xsd type). Prescriptive easements often arise when rural land is being used by, say, a. A loud buzzing coming from the AC panel board. Proper tapering of the primary insulation requires taping the conductor as a protection to avoid damage by the knife blade. Standards UL Type 3R Complies With. 7511 June, 2014The output data set Cycles contains any circular dependencies, and the data set TransClosure contains the transitive closure . Open. Use acoustical dampening material. Completely concealed hinge system. This course also describes the general. No what I'm saying is: if you want to be a lineman, be a lineman. “The Durham Company is excited for the future growth of our company and for our expansion into the Buffalo, Missouri area,” The Durham Company CEO, G. Number of Household Members. sas. List. A set of 13 (per phase) 500 MCM conductors might get you there. asking for the origin* e^0 should display two provenance sequents: one for e^0, one for e^1, which happens to be an alternate. Design criteria for room ventilation. provide data concerning system parameters (voltage, current flow, power flow) for use in operating the utility system. MTU 10V0183 GS350 Gas Generator Set 350 kWe/60 Hz/Standby/208 - 600V Reference MTU 10V0183 GS350 (300 kWe) for Prime Rating Technical Data System ratingsS&C’s “live-front” PMH Pad-Mounted Gear features directly accessible components which are readily visible during operation of the gear. By Hubbell Power Systems. However, in the following case I have the example of a query that is notElectric power hinges provide an electronic access control mechanism for secure locking of commercial doors. I’m from South Jersey. Hubbell Shelters can be used in a myriad of pad-mounted equipment applications. Sounds electrical to me, definitely not a grinding noise. Command terminated by signal 4. By Hubbell Power Systems. In computer science, transclusion is the inclusion of part or all of an electronic document into one or more other documents by reference via hypertext. There is limited adoption of. SYSM 6306, Modeling and Simulation, Classwork 07 1. The transitive closure of a graph is a graph such that for all there is a link if and only if there exists a path from to in . Dead front transformers are fully insulated and can be switched by lineman using rubber gloves. c. Once you have cycles the transitive closure should convert them to reflexive symmetric subsets. The output data set Cycles contains any circular dependencies, and the data set TransClosure contains the transitive closure . Transitive closure. Aluminum mechanical bar connector eliminates compression tools, lugs and bolt assemblies;Aluminum enclosure is lightweight, low maintenance and has excellent corrosion resistance;Ample working space, allowing for easier termination with a removable swinging door;All-welded construction: welds and seams are ground smooth;Manufactured to. Maybe I am missing something concerning the definition of the satisfiability of a query. All information is real-time so you receive the most current, up-to-date inventory availability and pricing. Income Eligible Program. Coupling is achieved with one 360. According to our records, this release is the only version of this file offered by MathWorks. The program calculates transitive closure of a relation represented as an adjacency matrix. Concentric Neutral. The output data set Cycles contains any circular dependencies, and the data set TransClosure contains the transitive closure . Padmount Transformer. If there is a path from node i to node j in G, then there is an edge between node i and node j in H. Combine self-service technology with expertise cost-effectively for superior customer experience and more efficient operations. 83 of May 2, 1941, as amended. Figure 4-1: Transclosure and davit pole installation in median Figure 4-2: Transclosure installation improved with community-oriented art Figure 4-3: Milwaukee Harp Luminaire Lighting The City of Milwaukee owns and operates a unique electrical system that is divided into roughly two equal halves. The program calculates transitive closure of a relation represented as an adjacency matrix. The film follows an in-depth look. Hahah right. 34K subscribers in the Lineman community. The information contained in this document is not a design manual nor is it to be a substitute for responsible engineering practice. The directed graph G can be represented by the links data set LinkSetIn as follows: . @salmans you wanted me to write this down in the meeting i believe you mean that the SMT solver, when generating a model, deals with equality, and will collapse two names into the same element. transClosure() • The matrix multiplication that is performed is O(n3). The way they were explained to me is that it is an overhead transformer mounted to a short pole and inside a enclosure to protect it. For multigraphs with multiple edges between the same two nodes, the output. Each half is defined by the voltage of the system. With this associativity, T(w12,w23,w34) is uniquely defined and is denoted as T(P14). A. Flase. Some electrical cabinets feature Quazite® precast polymer concrete construction that’s. A 4000A switchboard “SWBD-1” serves retail electrical panels ranging from 150A to 400A, loadcenters in both rental and condo units, and a 2000A switchboard “HSWBD”. 2 2. A closing disclosure is a legally-required, five-page statement of your final mortgage loan terms and closing costs. V. 3: Mathematical Optimization Procedures documentation. Easy to install and safe kit with the 10amp fuse remaining captive on the load-side when opened. This transfer switch shows examples of how both labels are implemented in an end-user application. Ainsi, ce fourni des specifications formelles issues des deux approches differentes pour la definition des modeles de donnees: une basee sur l’algebre et l&#39;autre basee sur la logique. Rip pops. Study with Quizlet and memorize flashcards containing terms like What is exposed once you open the door to a live front switch?, What is an NX fuse?, How many amps is a single ph live front switch? and more. . El transclosure se construir segn normas ASA y NEMA. 5 mm, compression +/- 1. Cummins OTEC 480-Volt 225-Amp 3 Phase PowerCommand 40 Automatic Transfer Switch NEMA 3R | A066Y110. Your dryer is making a buzzing noise while running. 23s total 12224Kb max memory. 23. Comes pre-assembled with 1’ whips, contains two insulation piercing connectors, and provides a water-tight connection. Given the transitive closure of , you can. At Systems Control, we design, manufacture and test our turnkey equipment enclosures all under one roof. 16 (A) of NEC 2017. Rip pops. You're correct. The enclosure shall be fabricated from 11-gauge A60 cold rolled galvanneal steel. Suppose we have three transformers each having the same rating (50 KVA). . Resource Quick View. Finally, they may check for any loose wires or frayed insulation near the circuit breaker box and repair them if necessary. Element (i,j) in the matrix is equal to 1 if the pair (i,j) is in the relation. 1 M3801 Material Standard for Precast Pads and Covers 5. less-flammable liquid** InstallationTrinetics multi-connection secondary termination enclosures provide safe, convenient, and aesthetically pleasing connection points for multiple services suitable for up to 600V. right now, the REPL will not reload the theory if the configuration options are changed possible solutions: keep it as it is as is, with a printout making the user aware that they should reload rel. You can reduce the noise produced by the transformer by covering the walls of the transformer cabin with noise absorbent materials such as acoustic tiles, kimsul, or fiberglass. 3: Network Optimization Procedures documentation. Instructions: The following standards are from AC 150/5370-10, Standards for Specifying Construction of Airports. A transclosure is a pole mounted switch that connects a URD system turn underground feeder cable. I’ve retired almost half of these over my 17 years in the trade. Annual Household Income. sobrecierre, cierre de la mandíbula antes de que los dientes superiores e inferiores se junten. True. The enclosure shall be fabricated from 11-gauge A60 cold rolled galvanneal steel. I have a new pad mounted transformer with ten conduits going to a transclosure ( just a big JB with four busses). What is a Transclosure? Within our Electric Network we have several transformers within transclosures. . Transitive Closure it the reachability matrix to reach from vertex u to vertex v of a graph. Distribution grid refers to the final stage of the electrical grid which distributes electricity to homes, industry, and other end users. If you want to be an electrician than be an electrician. When you call let tc = transClosure matrix, tc is just an alias to matrix which has been changed. *get one of the many practice books, like Surveying Porblems.