Medium rate voltage connectors especially cable and wire are the power transmitters most often used in the commercial, industrial and electrical industries. Nowadays, these products are used for thermostat devices and temperature controllers. Standard voltage values for MV (medium voltage) cables are between 5 kV and 35 kV, but this range may vary depending on the manufacturer and standard. MV-90 cables and MV-105 cables are rated up to 90°C and 105°C respectively and are the two most common designations. Medium voltage cables are available in a variety of styles and their basic structure and common uses should be understood before purchase. 
Medium voltage cables are available in single and multi-conductor, shielded and unshielded types for flexible installation. Medium voltage cables are typically designed with ethylene propylene rubber (EPR) or cross-linked polyethylene (XLPE) insulation. Some common jacketing materials for medium voltage cables are polyvinyl chloride (PVC) and chlorinated polyethylene (CPE). The most popular shielding options are copper tape shielding or copper wire shielding spirally applied to the insulation. Medium voltage cables are available in two insulation classes, 100% or 133%. These insulation levels allow the cable to better handle voltage surges in the event of a system failure. The insulation class you choose depends on the fault recovery time of the system. If the fault clearance time is 1 minute or less, use 100% isolation rated cable. 100% is typically used for grounded systems with minimal voltage rise. Uses 133% isolation level for troubleshooting in less than 1 hour. It is typically used in high resistance grounded or ungrounded systems where voltage levels can increase phase by phase. Medium voltage cables are often used as the main power source for a number of applications. If you install these cables according to NEC standards, they are suitable for wet or dry locations. Known for their electrical stability and rugged design, medium voltage cables are used in harsh applications such as pulp and paper mills, petrochemical plants, steel mills, textile mills, water and wastewater treatment plants, mines, railways and power plants. MV cables are also approved for conduit, open tray, overhead, direct burial and underground conduits. 
Medium voltage cable for thermostat
Unlike low voltage thermostats that control heating and air conditioning systems, base plate heaters use a mains voltage thermostat installed as part of a full voltage circuit to heat the heater. The thermostat can be mounted directly on the heater itself, or it can be wall mounted so that the circuit wires go through the thermostat first to the base plate heater. The new mains voltage thermostat is connected as part of the new base heater. Thermostats can also wear out and need to be replaced. Regardless of where it is located, connecting a line voltage thermostat to an electric baseboard heater is a relatively easy task. The line voltage thermostat for the baseboard heater is really just a variable switch that is mounted on the circuit from the breaker panel to the baseboard heater. The device works in the same way as a dimmer providing variable control to a light bulb. Basic line voltage thermostats use simple rotary knobs, but there are more advanced electronically programmable models. Although programmable thermostats offer more control options, they are wired in the same way as regular rotary thermostats. Mains voltage thermostats can control a pedestal heater or several heaters connected to each other. A thermostat works by measuring the room temperature and controlling the amount of current in the wires leading to the heater. Most baseboard heating systems use 240V circuits, but 120V heaters can also be used. They are often used to provide extra heat to a single room, which is also provided by the central heating system. 
There are two types of mains voltage thermostats for 240V heaters: unipolar and bipolar. Unipolar thermostats are sometimes referred to as "two-wire" thermostats, while bipolar thermostats are referred to as "four-wire" thermostats. Some thermostats can be connected in both directions. In a unipolar thermostat, only one of the two hot wires entering the thermostat box is connected to the thermostat. Another wire runs through the thermostat box and continues to the base plate heater. This means that the bottom plate always flows and flows into it. For bipolar thermostats, both hot wires entering the thermostat box are connected to the thermostat. Bipolar thermostats provide a true "off" function because when the thermostat is turned off, the off current to the base heater is completely cut off. Be sure to select the thermostat type specified by the base heater manufacturer. Most specify unipolar or bipolar thermostats, although some may allow it. Let’s discuss a bit more about the different unique specifications which MV cables can have, then we will discuss the thermostat types and specifications. Copper and aluminum are the two most important conductor materials. Copper is mainly used in medium voltage designs, while the lighter weight aluminum is more commonly used in high voltage cables. Different materials are used for medium voltage jackets. Cross-linked polyethylene or XLPE is the most recommended, but ethylene propylene rubber or EPR, chlorinated polyethylene or CPE, and neoprene are also used. 
The most important factor a cable manufacturer must consider when selecting a cable and its jacket material is the proper wall thickness, especially according to UL and CSA standards. End users should consider how the jacket will withstand their environment such as sunlight, heat, cold, etc. We discussed the thermostats and the MV cables, as the above information show MV cable can handle the heat and cold with a suitable sheath that makes it one considerable As was mentioned, in general, thermostats are responsible for temperature control, and there are different types with different functions. Can be used to control engine internal temperature, room temperature, parts internal temperature and all parts that need to be checked. We now refer to two examples of thermostats used in electrical panels: 1- Room thermostat: This type of thermostat is used to control the temperature in closed spaces, such as rooms or boards. This type of function is very simple and has several parts: The degree of temperature regulation is usually between 10 and 60 degrees. Power supply for operation (of course, some are completely mechanical structures that do not require a power supply) Open and close the contacts to control and control the fan or heater, you can see on the opposite card that 220 volts is connected to the PH and N base to supply the thermostat, open contact 15-18 for the command connections to the coil contactor C. Suppose we want to set the temperature in the electrical room to 23 degrees. When the thermostat is installed in a panel, its switches will operate when the temperature rises above a set limit. Connect contactor C. It is now possible to connect the contactor to the fan and extract the hot air inside the electrical panel. This is where the ambient temperature is usually higher than we need. 2- Thermostat with thermocouple: Suppose I want to keep the temperature inside the oven at 200 degrees. For this we cannot use the previous type of thermostat because the temperature inside the oven is 200 degrees and there is one with a thermocouple. 
Medium voltage wire for thermostat
The low voltage cable and wire are mostly used in the thermostat for temperature control but in some of these devices, the medium voltage comes in handy too. To keep the temperature of the system within a certain area and range, they use a device called a thermostat. The temperature maintenance function is performed by controlling the flow of thermal energy into or out of the system. Generally speaking, a thermostat is an automatic electrical controller used to regulate the temperature of an enclosed space. Typically, this function is connected to cooling or heating equipment, so by disconnecting and connecting the equipment, it automatically keeps the room at a set temperature. Now, according to the above, when the temperature of the unit reaches the set point, the thermostat performs its task, which is to stop and disconnect the circuit of the unit, and when the temperature goes from 3 to 5 degrees Celsius, if the set point drops, it will reconnect the circuit, so the unit will turn on and start working. Thermostats are used to regulate the temperature of liquids, gases and solids in different parts of a heating or cooling installation, as we will explain below:
- Construction sector: The construction sector, including temperature control for central heating and air conditioning systems, coolers and fan convectors, etc.
- Industrial sector: including greenhouses, furnaces, boilers, etc.
- Household appliances segment: washing machines, frying pans, electric samovars, dishwashers, electric ovens, electric water heaters, and gas water heaters.
Thermostats are divided into different types according to the installation location, season, function type, sensor type, working area, number of working positions and heat as follows:
- In terms of heat, it is divided into hot type and cold type.
- According to the type of operation, it is divided into interrupted and progressive.
- According to the installation position, it is divided into room type, channel type, submerged type and wall-mounted type.
- As for suffering, it is divided into below zero and above zero.
- As for the number of steps, it is divided into one step, two steps and one step (step control).
- According to the sensor type, it is divided into lantern type, bimetal type, varistor and diaphragm type.
- According to the season, it is divided into three seasons: summer, winter and second season.
Mechanical sensor thermostats work by using commands from thermal sensors to break and connect circuits through a series of mechanical interfaces to micro switches. There are two different types of electromechanical thermostats themselves. Temperature sensor, its function is described as follows: 1- The first operation is based on the principle of fluid expansion. This means that when the temperature of the sensor rises, the liquid enters the membrane through the capillary and creates a working expansion through which the circuit can be opened or closed using a spring switch. 2- The other is a metal thermostat with metal expansion, the metal expands and the spring key works directly. The thermostat works with a digital sensor, it receives a command from the temperature sensor and sends it to a micro-relay through an electric current, which disconnects and connects the electric current.