0
Is it permissible to install high voltage in rigid non metallic conduit in a tunnel?
Answer for USA, Canada and countries running a 60 Hz supply service.
For permanently installed equipment in tunnels I find no special limitation on what can be used. I take this to mean that high voltage conductors in rigid non metallic conduit may be installed in a tunnel if other provisions of the code are followed, such as using schedule 80 PVC when the conduit may be subject to physical damage.
As for mobile or portable equipment, non metallic raceways may not be used in tunnels.
<><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What else can I help you with?
What type of conduit is used for 480 volt 3-wire?
Conduit is just a medium to get the wires from one place to another. There is no voltage restrictions in low voltage wiring (750 volts or less). When it comes to conduit fill, electricians are governed by the electrical code conduit fill tables. The conduit is sized to accommodate the conductor size for a specific load.
Why is a line voltage thermostat mounted on an electrical box that has conduit connected to it?
Reduces fire hazard. Jcastillo
What are the disadvantage of steel conduit?
main disadvantage of Steel conduit A. Anternal condensation result insulation damage B. not with stand especially mechanical accident C. complete protection against Fire hazard D. it can be used as circuit protective conduct The main advantage of voltage transformer A. To get neutral wire B. To produce sufficient illumination. C. To gain extra voltage
Why 2 different phase wire are not supposed to pass through same conduit?
When two different phase wires pass through the same conduit, there is a risk of inductive coupling between the wires. This can lead to interference and distortion of the electrical signals, potentially causing malfunctions or damage to the electrical system. Additionally, having two phase wires in close proximity can increase the likelihood of short circuits or electrical faults. It is important to follow proper wiring practices to ensure the safety and efficiency of the electrical installation.
What is the minimum burial depth of ridged metal conduit below a residential driveway?
The minimum cover requirements for direct buried conduits in vehicular areas is governed by the voltage in the conduit. Under 750 volts 600 mm (24 inches), over 750 volts 1000 mm (36 inches).
What is the recommended type of conduit for low voltage wiring installations?
The recommended type of conduit for low voltage wiring installations is typically non-metallic flexible conduit, such as PVC or corrugated tubing. These materials provide protection for the wiring while allowing for flexibility and ease of installation.
What type of conduit is used for 480 volt 3-wire?
Conduit is just a medium to get the wires from one place to another. There is no voltage restrictions in low voltage wiring (750 volts or less). When it comes to conduit fill, electricians are governed by the electrical code conduit fill tables. The conduit is sized to accommodate the conductor size for a specific load.
Can you put low voltage sound wires and low voltage light wires in the same conduit?
noyou can not
At what voltage do you need to use double locknuts on Rigid Metal Conduit?
There are no voltage regulations. A rigid conduit system used two locknuts and one bushing at every connection to a junction box unless the box has a hub. One outside the box and the other locknut inside the box. These are tightened against each other to make the connection secure and to scratch the paint on the outside of the box to make continuity of the metallic system. Continuity of the system is a must as this is the return path for any short circuit that might occur. Rigid connections to fittings require no locknuts as the conduit's threaded end screws into the fitting.
What is the permissible voltage drop in a 120 volt power supply?
5% from source to farthest load.
What are the best practices for installing low voltage conduit in a residential setting?
When installing low voltage conduit in a residential setting, it is important to plan the layout carefully, use appropriate materials, follow local building codes, and ensure proper grounding. Additionally, it is recommended to label the conduit for easy identification and to leave some slack in the wires for future maintenance.
Why is a line voltage thermostat mounted on an electrical box that has conduit connected to it?
Reduces fire hazard. Jcastillo
What are the factors to consider when determining NEC conduit sizing for electrical installations?
When determining NEC conduit sizing for electrical installations, factors to consider include the number and size of conductors, the type of insulation, the ambient temperature, the conduit fill ratio, and the voltage drop.
The calculation used to determine amperage of a conductor based on the total number of conductors in a conduit is called A derating B voltage drop C conduit fill D conductor fill?
derating
How do you install a voltage regulator in an 1989 Chevrolet Beretta GT?
The voltage regulator is in the alternator.
When do you derate wires in conduit I know the code says more than 3 current carrying conductors but is there a length of conduit run when you should start to derate?
There are two things here to keep in mind. If you are trying to add more conductors to an existing conduit run use the cross sectional area of the conduit to see if more wires can be fitted. The second thing that's relates to length is the voltage drop at the load. To size the conduit work backwards from the load amperage to size the wires. If a long distance is involved a voltage drop calculation will be needed. Then select the conduit size to accommodate the wires recommended for that load amperage. The length of conduit run is not brought into the equation on de rating wire size it is always about keeping the voltage up at the load end of the run by increasing the wire size and selecting the proper conduit size for that wire.
What is the maximum voltage drop normally permitted from the supply authority to the consumer's terminal?
3 % (+ or -) on LT side is generally permissible. (in India)
