New Electrical Work

It depends on whether the building classification is combustible or non combustible. On a new commercial building wiring is usually designed by an electrical engineer. In this case the wiring is done to their specifications. On a rewire of a commercial building BX cable can be used behind wall board. The reasoning is that most commercial buildings these days use steel studs. Dragging ordinary NMD wire through these types of studs can cut the outer sheath. In some jurisdictions steel stud bushings have to be used when a steel stud is hole punched. By using this type of wiring cable, rigid conduit or EMT does not have to be used.

No, bedroom lights fixtures do not have to be on arc fault breakers. In fact it is better if they are not. The neutral should return straight back to the distribution panel, for the arc fault circuit that the neutral is in. In some jurisdictions an electrical code amendment requires that the cable fed from arc fault breakers be identified with a blue outer sheath.

Yes, the are both containers in which something can be placed inside.

No, the electrical code requires that the mineral insulated cable be strapped at proper intervals and not be piggy backed on to other conduit structures.

There should be no reason to install two ground wires in the same conduit. Code requires that only a single path should be required if it is to carry a fault current. This ground wire should be single and continuous from the device back to the distribution panel. It is the fault current that is carried on the ground wire that trips the breaker or fault protection device. Don't confuse grounding wires with bonding wires.

The size of conductor needed will be a #14. It should be copper and have an insulation factor of 90 degrees C. The fact that it is a three phase load does not enter into the calculation of the wire size.

Standard Conduit Locknuts are used to secure threaded conduits or connectors with tapered or straight thread to a knock out or unthreaded slip hole. Sizes range from 1/4 inch up to 4 inches.

For a 300 Amp service entrance, you typically use a minimum of 250 kcmil (thousand circular mils) copper wire or 350 kcmil aluminum wire, according to the National Electrical Code (NEC). However, the exact wire size can vary based on factors such as the length of the run, ambient temperature, and installation conditions. It's essential to consult local electrical codes and possibly a licensed electrician to ensure compliance and safety.

There is no one wire that is rated for 1800 amps. The service will have to be a quad parallel of the conductors. A 600 MCM conductor with an insulation factor of 90 degrees C is rated at 475 amps. This conductor paralleled into four equal lengths will give an ampacity of 1900 amps for each leg of the service.

Back set for all conduit sizes is not the same. The greater the diameter of the conduit the length of back set increases. Without the diameter size of the conduit, an answer can not be given.

Yes. The voltage of 120 volts is a nominal figure. The utility company has a plus or minus tolerance from 110 to 120 volts. This tolerance is based on the figure of 115 volts.

1. hot - this is the short slot - connected to the black wire
2. neutral - this is the long slot (15A) or T shaped slot (20A) - connected to the white wire
3. safety ground - this is the round or U shaped slot - connected to the green wire (sometimes this is a bare wire)

The gauge of wire that is 12 volt is 18, 14, and 16.

The grounding system of a distribution must be from zero ohms to a maximum of two ohms. This is usually obtained by bonding all metallic parts back to the distribution centre with a wire capable of handling the circuits fault current if the circuit should ground out. The ground wire in cable sets is used for this purpose.

To answer this question the units amperage must be stated or calculated.

The panel and breaker have to be of the same manufacturer. This way the breaker will fit into the panel. If the panel has a push in bus bar, the breaker must also be the type to accept the bus bar. If the bus bars in the panel are of the bolt in type then the breaker also has to be a bolt in breaker.

Conduit wiring system is preferred for workshop lighting.

It is not true...

There are two distinct questions here. To determine the wire size to carry 15000 volts the circuits load amperage must be stated.

The wire size for a 550 amp service is, an 800 MCM copper conductor with an insulation factor of 90 degrees C. This conductor is rated at 555 amps. Parallel 250 MCM will give you a total capacity of 580 amps. A triple run of 2/0 will give you a total capacity of 585 amps.

The smallest slot is the hot side the larger slot is the neutral slot assuming the outlet was wired correctly.

16 gauge is rated at 13 amps, but I would use 14 gauge which is rated at 15 amps just to be safe.

Yes, there are ground wire gauges. The approiate size ground wire must be matched to the size service you are installing. For instance a 200 amp serivce must be grounded with a # 4 bare copper ground wire.

Draw two parallel vertical lines on a piece of paper. Visualize these as a left side and a right side of an upright ladder. The left side will be called the "hot" wire and the right side will be the neutral wire. The cross pieces in this diagram will be the rungs of the ladder. Draw a line from the left hand side of the ladder to the right hand side of the ladder. Insert into this rung one of the two light bulbs. Below this rung copy the above rung with the second light bulb. Into this second rung insert a switch in series with the second bulb. When the complete circuit is powered on the first bulb will light and depending on the position of the switch in the second rung, the second bulb will light if the switch is closed. If the switch in the second rung is open the bulb will not light.

This will be the drawing that your scenario suggests.