It is also designed to open the circuit to the load if the neutral conductor is inadvertently grounded between the interrupter and the load. This is defined as a “Class A ground fault circuit interrupter” (Class A GFCI). Where the GFCI is required to provide protection for personnel, the level must be above 4 milliamperes but not more than 6 milliamperes and must operate within a time-frame of less than 25 milliseconds. This value must be less than the current level required to operate the overcurrent protective device of the circuit. The GFCI is designed to open the circuit, or a portion of the circuit to a load, within a predetermined value.
The code requires ground fault current to be detected, and in most cases requires electrical equipment to be protected from a ground fault by interrupting the undesirable fault current.Ī ground fault circuit interrupter (GFCI) breaks the fault current. The Canadian Electrical Code* defines a “ground” as a connection to earth obtained by a grounding electrode, and a “ground fault” as an unintended electrical path between a part, operating at some potential to ground, and ground. The following overview outlines how ground fault detection and protection ensures the safety of personnel and equipment. Since Autocad is way better at drawing 2d shapes than Altium, this saves you a lot of time.Since ground fault circuit protection was adopted in Canada over 40 years ago, the number of people dying annually from electrocution has been steadily reduced from over 800 to less than 200, and much electrical equipment and other infrastructure has been saved from damage (source: Electrical Safety Foundation International ESFI). You import the Autocad file into Altium, and select the appropriate layer as your mechanical layer on the PCB. Fortunately, the mechanical engineer sitting next to you has already drawn the dick shape of the PCB, and it's hole locations, in Autocad. Your motherboard has screw holes that need to be placed in very precisely but oddly located positions on the PCB.
To avoid crosstalk with other channels, you program design rules into Altium that prevent you from routing traces too close to components that will cause interference. You need to route some bus around the motherboard to some connector. The electricians spend the rest of the day cursing you for your naivety. It gets printed onto a jumbo size paper and handed to the electricians who will construct your network. You draw both the wiring diagrams and the blueprint of the facility in different layers on top of each other in an Autocad file. On top of showing what cables will plug into which router, you also need to show where the cables will run in a 2d blue print of the building. You have a million routers and switches that are going to connect a zillion Cat6 cables to different places. You are designing the network topology of a serverfarm for Fortune 500. Although they appear to be used to accomplish similar tasks, clearly it would be silly to try to use them interchangeably.Īutocad = Showing how devices connect mechanically.Īltium / etc = Showing how circuit components connect electrically. It's like comparing a wine bottle opener to a tin can opener. They are different tools for different scenarios. But you would never, ever use Autocad for PCB design. Send the moderators a message and we can unblock it as soon as possible.
If the problem is truly an engineering problem, we'll allow it, but fixing your laptop or a cracked LCD screen doesn't qualify.ĭo not post Discord links, surveys, or job postings (with the exception of the monthly job post).Ĭan't find your submission? It was probably caught by reddit's spam filters. Tech support help can be found in /r/gadgets. If you have specific, targeted questions regarding homework, we will help you out only if you have provided some beginning work.
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