0
In a conduit run, two ninety-degree bends would typically require the use of a pull box to facilitate pulling wires through the bends, as this creates a significant restriction. The four forty-five degree bends, however, generally allow for easier wire pulling and may not necessitate a pull box, depending on the overall length and type of wire. Therefore, the combination of two ninety-degree bends specifically necessitates a pull box.
What else can I help you with?
Which one of the following combinations of bend in a conduit run require the use of a pull box two 90-degree bends and four 45-degree bends two 90-degree bends and five 30-degree bends?
The electrical code states that there shall be no more than four 90 degree bends in a conduit length between pull boxes. This equals 360 degrees. The first scenario 90 + 90 + 45 + 45 + 45 + 45 = 360 degrees so that conduit run is acceptable. The second scenario 90 + 90 + 30 + 30 + 30 + 30 +30 = 330 degrees so this combination is also acceptable.
One problem when using rigid metal conduit in a residence is that installation of the conduit may?
One problem of using rigid conduit in a residency when it is not needed is that project will very quickly over run the budget of the project. Labour will be at least 5 times more expensive to install rigid over NMD90 cable.Another problem will be the tight bends required in home wiring as compared to the radius bends that rigid conduit requires.
What size conduit do you need to install a 0000 wire?
4/0 gauge wire, depending on its insulation type is rated from 230-260 amps. Assuming you are running a new power supply with the 4/0 wire, you will have a minimum or three 4/0 conductors and a ground wire for a single phase power supply and four conductors with ground for a three phase power supply. Three 4/0 wires require a minimum 2 inch conduit. Four 4/0 wires require a minimum 2 and 1/2 inch conduit. These conduit sizes I'm quoting come directly from the NEC, the National Electric Code. These sizes of conduit are determined by the basic rule that all the conductors in a conduit are not to exceed 40% of the volume of the pipe. The other 60% of air space is required for heat dissipation.
Is there a distance limit for conduit runs between junction boxes?
No, there is not a distance limit. Most prints have specified 200' and local jurisdictions may impose a limit. The largest fish tape I've ever bought was a 200' so unless I want to vacuum a 'mouse' through the pipe; I go with 200'.
Which of the following processes cause substances to move across membranes and doesent require energy ATP?
diffusion or osmosis (diffusion of water)
What combinations of bends in a conduit run require the use of a pull box?
Code states no more that 4 - 90 degree bends in a conduit run between pull boxes.
Which one of the following combinations of bend in a conduit run require the use of a pull box two 90-degree bends and four 45-degree bends two 90-degree bends and five 30-degree bends?
The electrical code states that there shall be no more than four 90 degree bends in a conduit length between pull boxes. This equals 360 degrees. The first scenario 90 + 90 + 45 + 45 + 45 + 45 = 360 degrees so that conduit run is acceptable. The second scenario 90 + 90 + 30 + 30 + 30 + 30 +30 = 330 degrees so this combination is also acceptable.
Does conduit 2 require Wii motion plus?
no its just optional whether you want to use motion plus or not
Why do they require asphalt paint om outside of rigid conduit?
Asphalt paint is applied to the outside of rigid conduit primarily for protection against corrosion and environmental damage. The paint creates a barrier that prevents moisture and chemicals from degrading the metal, extending the lifespan of the conduit. Additionally, it can provide a level of insulation and improve visibility for safety purposes. Overall, using asphalt paint enhances the durability and functionality of the conduit in outdoor installations.
When do you need to use conduit from the meter box to the breaker box?
You need to use conduit from the meter box to the breaker box when running electrical wiring in areas where protection from physical damage is necessary or when local codes require it. Conduit provides a durable pathway for the wires, safeguarding them from environmental factors and potential hazards. Additionally, using conduit can help organize and support the wiring, ensuring compliance with safety regulations. Always consult local electrical codes for specific requirements.
One problem when using rigid metal conduit in a residence is that installation of the conduit may?
One problem of using rigid conduit in a residency when it is not needed is that project will very quickly over run the budget of the project. Labour will be at least 5 times more expensive to install rigid over NMD90 cable.Another problem will be the tight bends required in home wiring as compared to the radius bends that rigid conduit requires.
What size conduit for 200 amp service?
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
What size conduit do you need to install a 0000 wire?
4/0 gauge wire, depending on its insulation type is rated from 230-260 amps. Assuming you are running a new power supply with the 4/0 wire, you will have a minimum or three 4/0 conductors and a ground wire for a single phase power supply and four conductors with ground for a three phase power supply. Three 4/0 wires require a minimum 2 inch conduit. Four 4/0 wires require a minimum 2 and 1/2 inch conduit. These conduit sizes I'm quoting come directly from the NEC, the National Electric Code. These sizes of conduit are determined by the basic rule that all the conductors in a conduit are not to exceed 40% of the volume of the pipe. The other 60% of air space is required for heat dissipation.
What are some current effects of the Protestant Reformation?
The most important effect is that reformers ,ie Luther and Calvin, taught that Christians have an open and direct communication with God that does not require a human conduit, (priest)
Does bacnet HVAC cable have to be in conduit?
BACnet HVAC cables do not necessarily have to be installed in conduit, but local codes and regulations may require it for protection against physical damage or environmental factors. It's important to follow the manufacturer's specifications and adhere to any applicable electrical codes. Additionally, using conduit can help to reduce interference from other electrical devices and enhance the overall durability of the installation. Always check with local authorities or a qualified professional for specific requirements.
What size conduit for 1200 amp service riser?
For a 1200 amp service riser, the appropriate conduit size typically depends on the type and number of conductors being used. Generally, for copper conductors, a 4-inch diameter conduit is often sufficient, while aluminum conductors may require a larger size due to their physical properties and insulation types. It's essential to refer to the National Electrical Code (NEC) and local codes, as well as consider factors such as conduit fill and bend radius, to ensure compliance and safety. Always consult with a licensed electrician or engineer for specific project needs.
In what situation is trunking used and not conduit?
Trunking is typically used in situations where there is a need to manage and protect multiple cables in a tidy manner, such as in commercial or industrial environments where numerous electrical or data cables are routed along walls or ceilings. Unlike conduit, which encases individual wires for protection, trunking allows for easier access to cables for maintenance and modifications, making it ideal for installations that may require frequent changes. Additionally, trunking often offers a more aesthetically pleasing solution for visible cabling compared to conduit systems.
