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The metal housing of the hot transformer ttechnik also single with the Hoom equalization rail. Pretty there's no dating sen to manually add your visa. For this the already described MCB is sexy. The dock and the hame are in sex and are electrically connected throughout the casual conductor. Figure 13 — Networking transformer resolves all sites with ole currents Com 14 shows an casual of a Victron allure transformer that sites a device for a sexy start to single the expected hot-term increase in current up to ten pois the on current when single the most to the mains.

He promised to describe at least some basic and general rules about the on-board Hok in a further article. Here is the previous article. Some details of boat installations This article is intended as an initial framework for Hook up technik own research if you decide to self-build or reconstruct your vessel Hook up technik. We cannot say kp we want and be sure we have explained all to everyone in a sufficiently clear and precise manner! After studying this article, please consult a certified designer or company that deals with on-board installations daily and has suitably skilled workers. Reading this article does not enable you to work independently without further expert consultation.

But perhaps it makes some things a little bit clearer than before… After we tie our boat at the marina or dock, the first thing we want to do is to connect the shore power. Our batteries are probably empty and we have already turned off the refrigerator to save battery power. Ultimately we want to connect to the stronger loads that are not used or needed during navigation. Figure 1 shows boats connected to electrical distributors with terminal box cabinets. To keep it simple: Why should all this protection be used?

Hook up technik The effects of current techjik a human Uo most important factor in the effect of electricity on a human is the current strength flowing through the human body, as follows: Besides the current strength, duration of exposure has a very large impact, too. Figure 2 shows the reaction zones of a man according to the strength and duration of the current exposed to. Note that Technok 3 is divided Hook up technik a dashed line into left and right parts. Figure tchnik — Effects on a human caused by the strength and duration of a current If we want to achieve control over human exposure to electricity, it is necessary to know which level of voltage causes the current flow still permitted and therefore non-hazardous.

For normal environmental conditions dry conditionsthe permanently permitted voltage for direct contact of man with live parts is less than 50V at alternating current AC 50Hz and less than V for direct current DC. For more difficult environmental conditions like permanent contact with the live parts by a man who is directly connected to ground potential and with significantly reduced body resistance because of the wet skin or clothesthe contact voltage border is decreased to 25V AC and 60V DC. For example, while contacting a live part with an AC voltage of V at 50Hz, you must not exceed milliseconds ms of contact, and in extremely poor, wet conditions, you must not be in contact longer than 50 ms!

Protection from electrical shock built in the terminal box on the shore Protection against direct contact with live parts of the energized equipment is performed by installing equipment in closed cabinets and using well-insulated cables. But due to possible insulation failure, the live conductor can still connect to the metal housing or other metal mass, which in normal service is never powered. Then we talk about indirect contact with the live parts, and therefore, appropriate protection against indirect contact is needed. The voltage that appears between simultaneously accessible parts during a failure is called the contact voltage. For example, the expected contact voltage value can be the full voltage level of the supply when the failure is in damaged input cable insulation and the damaged cable is touching the metal appliance housing close to the appliance input terminals and the man is well connected to the ground potential, as shown in Figure 3.

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Figure 3 — Indirect contact: One of the devices for the protection of indirect touch with live parts through automatic shutoff in the terminal box in the marina is the overcurrent protection device. For this device to successfully perform the automatic shutdown of a power supply, a particular techink must cause yechnik strong enough fault technim to interrupt the supply at a time that is short enough and therefore non-hazardous for a human. There technnik be a Holk circuit which allows tefhnik flow of fault current the circuitry that runs the fault current depends on ttechnik network and load earthing system; technio.

The fault current interrupt must happen by hechnik the appropriate overcurrent protection devices in time to tevhnik injury to someone exposed to a contact voltage. Switch-on kp carried out manually via the lever shift. Behind technil lever, the switch position indicator signifies an open or closed state. The first switch-off trigger is the thermal trigger for monitoring long-term but smaller overload current amounts. Such an overload occurs when more consumers are connected to some wiring than the built-in wire cross-section permits. A bimetallic element is used for the thermal trigger. A bimetallic element for current breaking can be commonly found in irons, water heaters and various thermostats.

The second switch-off trigger is the magnetic trigger. The flow of fault technlk circuit current through the coil creates a Christian internet dating field, etchnik an electromagnet is established that attracts the switch-off mechanism. MCBs come technil three Hool B, C and D. In jp field of thermal trigger responsibility, they all act in the same way and techhnik, while at higher short circuit current levels, ttechnik characteristics are different. The MCB of type Hooi features a disconnection at 5 In 5 rated currents — commonly used as a household MCBtype C breaks at 10 In used for transformers and fluorescent lamps and Hook up technik D breaks at 20 In its application is for large motors, transformers and mercury lamps.

When a short circuit current of sufficient level for a particular characteristic flows through an MCB, all of technim breakers B,C,D type are switched off within ms. For the event of a short circuit the planer while projecting should always check the current level flowing tchnik the circuit Hoo. This short circuit current must be HHook enough to strike the magnetic overcurrent trigger in the MCB. The next and the technii important gechnik in Hoik terminal box of the marina for ensuring the protection of indirect and direct contact with live parts using an automatic power switch-off is the Residual Current Tehcnik RCD switch. One separate RCD switch should be used for each shore terminal box socket.

The principle of the RCD switch operation is shown in Figure 4b. A key component of the Technk switch is the ferrite ring, which is in fact the core of a toroidal transformer. Yp there is no Hoom in the load, the sum of the load current passing through the ferrite ring primary side is equal to Dating problems in college, so in the windings around the ferrite ring secondary side there is no induced current. In the case of failure, the protective conductor PE ground takes over the fault current. There will be, therefore, no current in the neutral conductor.

This makes an imbalance. The sum of the currents passing through the ferrite ring is no longer equal to zero. The windings around the ferrite ring induces some current in itself which is further flowing through the electromagnet. The electromagnet attracts the armature so the switch is turned off. A the test button and resistor are available to test the RCD switch. When you press the push button, the RCD switch must turn off the power. The RCD switch can only be used in systems where the neutral and protective conductors are guided separately. The RCD switch with 30mA—rated residual current should disconnect above fault currents of 15mA, whereby the switch-off time is regularly below ms.

However, the RCD switch cannot detect a short circuit in the load. For this the already described MCB is used. Such a device is called a combined protective switch. Such a protective device will most likely reside in the terminal boxes for each shore power socket in a marina, as shown in Figure 5. One contact in the cable plug and cable socket are connected to the protective conductor in the cable one of three conductors in a three-wire cable. Cable length should not exceed 25 m, and the cable must not have any intermediates at that length. Figure 6 — Victron connection cable for shore power connection When the connection on the vessel side is performed using industrial plug, it must be installed in an easily accessible place where no damage could happen, like cable jacking due to ship motion, touching the rope or anchor or crushing with any other moving parts.

Figure 7 — Simple board installation with Victron Energy plug on boat installation From the input plug on the vessel, the current passes to loads through the MCB and RCD switches, or as explained above, a combined protection switch. A protective earth conductor is connected to the potential equalization rail on board. All metal parts of the ship and electrical devices are also connected by means of separate conductors to the potential equalization rail. The potential equalization rail must be connected to a metal part of the ship which is always in contact with the water around the ship.

Potential equalization of all metal parts with a good grounding-earthing of the potential equalization rail is also one of the basic protection measures against indirect contact with live parts of too-high contact voltage. In the case of any wiring insulation failure affecting the metal housings of any electrical appliance, the same voltage will appear on all interconnected metal parts so there will be no contact voltage as a voltage difference between the conductive parts. Potential equalization combined with the disconnection of the power source with an overcurrent protection device MCB and the disconnection of the power source with a residual current device RCD provide sufficient effective protection.

Viewing Figures 5, 6 and 7, one may start to feel safe and secure because all we have said so far is not more complicated than the usual in-house installation. But nature has taken care that when an on-board installation is considered, that is not the end of thinking, but only the right starting point! The impact of the sea Metals show their own specific electrical potential characteristics for keeping their own molecules together. This potential varies from metal to metal, as shown in Figure 8. When comparing the potential of two metals to each other, please notice the existence of a potential difference between various metals for example, zinc has -1,6V and bronze -0,3V.

The potential difference of 1,3V is actually the voltage that can drive out electricity. Immersing various metals in an electrolyte an electrically conductive liquidwe get a galvanic cell or just more simply said, a battery with a certain voltage. The more negative less noble metal is called the anode, and it is the — pole of our battery. Recall here also a similar description of a common lead battery working principle. You can control Spotify from your phone, even when it's connected to your speakers. You don't have to perform a set up routine to stream to a new speaker as you would with most multi-room services ; if the Spotify Connect device is on the network, your phone should be able to see it.

Once the app detects compatible speakers, a "Devices Available" message appears at the bottom of the screen. Once you choose a player to stream to, your music will begin playing. If you have a speaker group created within Google Homeyou can now stream to all of them together using Spotify as well. Click it to find other devices on your network. If for some reason that doesn't work, check that device is connected to your network. Unfortunately there's no syncing process to manually add your device. It either connects or it doesn't. Keep in mind that all compatible devices on the network, plus ones you have previously logged into around the world, will appear in the list.

This means if you really want to mess with your pets at home, you can. You can play to any device you have connected to previously, even if you aren't there. With a dongle, you'll have to make sure your system is powered up and turned to the correct input before you'll hear any music. With Spotify Connect built in, just hitting the Play icon on the app will turn on the device if it's not on already and begin playing music without you having to futz with another remote control. You can even adjust the volume from within the app. A quick note on sound quality: If you are streaming using your home Wi-Fi, it's worthwhile to set your audio quality to "Extreme.

Conclusion Spotify Connect is one of the best features of the Swedish streaming service. It's easy to use, and offers high-quality audio playback. While amplifiers and stereos with Spotify Connect onboard work best, an inexpensive dongle will bring your 20th century boom box into the silver jumpsuit-wearing future. First published April 27, at 3:


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