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What is the minnimum size equipment grounding conductor required by the NEC for a branch-circuit protected by a 50-ampere rated circuit breaker?
Wiki User
∙ 12y ago
#10 copper
Wiki User
∙ 12y ago
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Is it true that a building can be protected from lightning by grounding?
Lightning can still strike a building, but grounding makes the electricity in the lightning flow into the ground, making it a less of a danger to the people in the building. Yes its true
Why must a fuse always be connected in a non-earthed conductor?
It is the ungrounded conductor that carries the load current. It is that conductor that needs to be protected should a fault current occur. That is what the fuse in that circuit does.
Why fuse inserted in phase wire only?
The fuse is place in the live wire so that under fault conditions the supply is cut off but the equipment is still connected to the neutral wire. If both wires were fused, there would be a 50-50 chance of the one in the neutral going first, which could leave the equipment still connected to the live wire and thus a further potential danger.
Can I use a 30 amp disconnect switch non fused on 30 amp breaker with wire size 8 and its running a 25 amp shop heater?
Yes you can. In fact you can use #10 copper conductor with an insulation factor of 90 degrees C because it is protected by a 30 amp rated breaker. A #8 copper conductor with an insulation factor of 90 degrees C is rated at 40 amps. The only time you need to go to a larger size conductor is when you have to overcome voltage drop on longer runs.
How do you calculate the main fuse for electrical wiring?
Fuse sizing is calculated by the size of the conductor. The conductor is calculated by the amperage to the load. The above answer is partially right, however in calculating fuse sizes for say a motor load of 10 hp on 208 volts 3 phase. The table in 430.250 list this motor as pulling 30.8 amps. Conductor size would be 30.8 times 1.25 or 38.5 amps. This value would lead you to wire table 310.15(B)(16) and a conductor size of number 8THWN. This conductor is listed for 50 ampacity, however due to the starting current of the motor. A fuse could be sized at 30.8 times 1.75 or 53.9 amps. The next standard size would be 60 amps. the fuse size is above what the conductor is rated for, but because of motor overload protection the conductor is protected. If breakers were used instead of fuses, a breaker would be sized at 30.8 times 2.5 or 77 amps or 80 amp next standard size.
How is the star and delta timer connector protected?
As are most current carrying components in a control panel, they are protected from grounding out by having insulation wrapped around them.
Is it true that a building can be protected from lightning by grounding?
Lightning can still strike a building, but grounding makes the electricity in the lightning flow into the ground, making it a less of a danger to the people in the building. Yes its true
Does electric current damage vehicle?
no because any current that is incident on the vehicle is protected by the grounding provided by the tyres.
Electrolytic Ion Grounding Composition And Installation Location?
Ion grounding selection of cold-drawn yuan steel, with equipment outside the casting of purple copper (thickness of 0.3 ~ 0.5MM), to its excellent electrical conductivity and mechanical strength, the product has excellent anti-corrosion properties. Electrolytic Ion Grounding Electrolytic ion grounding composition ● Connection tube Rod and rod can be connected by copper connection tube, with good effect. The contact between the rod and the rod is so tight that the driving force acts directly on the rod when the grounding rod is driven into the ground or drilled into the ground with a driving drill. There are threaded connections and non-threaded connections. ● Drive head Made of alloy steel, it can drive the force into the ground smoothly. Ion grounding is driven into the ground under complicated geological conditions. Copper clad steel grounding rod for grounding network in the vertical grounding body, grounding in the entire lightning protection system occupies an important role, it affects the entire lightning protection system against direct lightning effect, direct lightning through the lightning rod / lightning belt and other lightning devices, and then through the grounding network into the ground, the grounding network of good or bad affect the overall effect. In foreign countries have used copper-plated grounding rod (copper clad steel grounding rod) instead of galvanized round steel, precisely because the effect of copper-plated grounding rod is several times higher than galvanized round steel. Copper clad steel grounding rod is electrolytic copper plating to the steel surface, high bonding without gaps, any bending will not produce copper layer stripping phenomenon, and because the surface of the round steel is high purity electrolytic copper, ion grounding so copper-plated grounding rod conductivity can be comparable to pure copper, is now the preferred grounding material for power engineering, petrochemical engineering, communications engineering, etc. The installation position of electrolytic ion grounding Ion grounding installation position especially when equipped with multi-level power supply lightning protection is very important, if not carefully considered, may be selected according to the technical requirements of the ion grounding is not very good protection. Both a waste of money. And left a lightning accident potential. This is due to when the overvoltage wave transmission along the cable, the protected equipment and the power supply lightning protection device between the energy reflection. This reflection phenomenon and the characteristics of the power supply lightning protector at all levels, the characteristics of the equipment being protected and the characteristics of the cable between them. It can cause overvoltage on the protected equipment that far exceeds the residual voltage on the power surge protector, and may be fed back into the power system to produce a bad effect. We are a professional grounding equipment manufacturer, if you are interested in this, please contact Sichuan Sunlight Intelligent Co.
Why must a fuse always be connected in a non-earthed conductor?
It is the ungrounded conductor that carries the load current. It is that conductor that needs to be protected should a fault current occur. That is what the fuse in that circuit does.
What is ampere rating of a fuse used to protect a 5.5 mm squared conductor?
The equivalent mm2 cross-sectional area of a 5.26 mm2 conductor is a # 10 AWG conductor. A # 10 AWG conductor size is protected by a 30 amp fuse.
How is the palace and park of Versailles protected?
they are using protective equipment to provent destruction
What are Personal Protection Equipment?
Personal Protection Equipment is clothing or items that you wear to keep you safe/protected from injuries, infections, diseases, etc.
List ways how equipment are protected from becoming damaged?
Cases, screen-protectors, covers and more
What precautions must be taken when using the chemicals and the optional equipment?
the operator must be protected from the splashing of the chemicals
What are the disadvantages of CMOS circuit?
The metal oxide coating that gives mos devices their high impedance characteristics is susceptable to damage by electrostatic discharge which must be protected by grounding the devices when handled during assembly.
Determine the defense area and the prevention method and equipment of each defense?
After the location and area that are vulnerable to intrusion are determined, we need to determine the prevention method and equipment for each defense area. It is better to have all areas protected. But if the environment situation and community security is good, you can only have the main entrance areas protected.
