To achieve the safety criteria of BS7671, an electrical system must include both earthing and bonding. Earthing and bonding are crucial components of any electrical system, yet they are frequently missed by unskilled individuals undertaking electrical work on their own. If you are not sure whether your installation meets the requirements of BS7671, then it does not.
Earning a certification is a great way to improve your knowledge on safe practices. Both the National Electrical Code (NEC) and Canadian Electrical Code (CEC) have exam versions available from either the American Society of Mechanical Engineers (ASME) or the Canadian Standards Association (CSA). The NEC Exam is administered by Pearson Education while the CEC Exam is administered by McGraw-Hill. It is important to note that while these exams can be used to check your understanding of the codes, only certification bodies can issue certifications. So even if you pass the exam, you will need to wait for someone with a badge to tell you you were successful.
If you are just starting out in an electrical career and want to get certified, then taking the NEC or CEC exam is a good way to begin. These are two of the most commonly requested certification tests so you will likely have an opportunity to take them sometime during your learning process.
Why is electrical bonding/earthing so important, and why does it need to be both mechanically and electrically secure? – According to Quora. Earthing systems are designed to safely channel anomalous currents to the ground, avoiding potentially dangerous voltage differentials from forming on equipment that humans may reach or touch. Effective earthing is therefore essential in preventing electric shock.
Earthed connections should not be made directly to water pipes, gas pipes or any other type of live metal pipe. If this does have to be done then a suitable earth conductor such as an earthing rod must be used instead. This needs to be attached to piping which is also earthed or connected to a good ground source.
The mechanical connection between the metallic part of the system and the grounding point must be able to withstand tensile forces while still providing an electrical path. For example, if a cable is used to connect equipment to a metal wall panel, the cable must be able to stretch with no loss of electrical contact with the metal. If the cable were to break under tension, it would disconnect the equipment from the metal wall panel, allowing current to flow through the broken link into earth. Mechanical stress can cause corrosion on metal surfaces which could lead to new problems later on. For this reason, cables should not be tied off or fixed in place without adding some form of protective covering.
Electrical security requires that there be no open circuits within the earthing system.
Earthing is the process of directing unwanted energy to the ground in order to protect anyone who comes into contact with a machine's metallic body during a fault. Bonding guarantees that both connected devices have the same voltage level and offers a low impedance channel back to the source to trigger the CB in the event of a fault current. Only connect one device at a time to avoid any confusion about which circuit is which when you turn them on at once.
Earning means that you are using the right terminals to connect up your battery. Bonding ensures that both batteries are always connected together otherwise if one battery stops working so will the other so you should always use a good quality fuse or circuit breaker in series with your battery pack. Failing this, you could be left with passengers in your car!
Earthing goes without saying but making sure that you don't leave any metal objects inside a vehicle is very important. This includes metal tools, containers or anything else that can spark when contacted by water from a shower for example. If this happens, the damage may not be apparent until after you've driven away so make sure you check everything before leaving home.
Bonding is also important because if you connect two different batteries together they might get too excited about sharing their power and one of them might explode. The best way to do this is with a load bank - another name for a jump starter.