HSS Drills
High-speed steel (HSS) is a form of tool steel; HSS bits are hard and much more resistant to heat than high-carbon steel. They can be used to drill metal, hardwood, and most other materials at greater cutting speeds than carbon-steel bits, and have largely replaced carbon steels.
An electric panel will generally have one or two covers. Panels with two covers have an outer cover (which will open to the side or upwards) and an inner cover, called a “Dead Front”. The dead front cover normally has the slots / knockouts for the breakers to fit into.
It is called a “Dead Front” for a reason
When the “Dead Front” is missing, the wiring, breakers and the bus bar is exposed. This is very dangerous. If a person comes into contact with or touches the live bus bar, a serious shock or injury could occur. Even death. That is how the name “Dead Front” came about.
Replacing the “Dead Front”
When the “Dead Front” is missing it is wise to replace it as soon as possible. Also, the main cover should be locked and tagged until the Dead Front is properly in place. A number of manufactures have replacement covers for their panels.
NFPA 70e stand Standard for Electrical Safety
NFPA 70E, titled Standard for Electrical Safety in the Workplace, is a standard of the National Fire Protection Association (NFPA). The document covers electrical safety requirements for employees. The NFPA is best known for publishing the National Electrical Code (NFPA 70)
When looking for SMA you may find SMA and RP-SMA connectors. What is the difference in these two?
Reverse polarity SMA (RP-SMA or RSMA) is designed to be incompatible with standard SMA connectors to comply with U.S. FCC regulations which seek to prevent consumers from attaching non-standard aerials to wireless devices.
The male RP-SMA connector has the same external housing as a standard male SMA connector except the center male pin is replaced by a receptacle. The female RP-SMA connector has the same housing as a standard female SMA connector however the pin found on a male SMA connector is on the female RP-SMA connector.
Here are some picture examples to help show the difference.
Devices attempting to connect to a LAN or WLAN require an authentication mechanism. IEEE 802.1X, an IEEE Standard for Port-Based Network Access Control (PNAC), provides protected authentication for secure network access.
An 802.1X network is different from home networks in one major way; it has an authentication server called a RADIUS Server. It checks a user’s credentials to see if they are an active member of the organization and, depending on the network policies, grants users varying levels of access to the network. This allows unique credentials or certificates to be used per user, eliminating the reliance on a single network password that can be easily stolen.
802.1X is a network authentication protocol that opens ports for network access when an organization authenticates a user’s identity and authorizes them for access to the network. The user’s identity is determined based on their credentials or certificate, which is confirmed by the RADIUS server. The RADIUS server is able to do this by communicating with the organization’s directory, typically over the LDAP or SAML protocol.
Source :
The Open Data Protocol (OData) is a protocol to request data through a query string.
The Open Data Protocol (OData) is a protocol to access data on the web. It provides a uniform way to query and manipulate data sets through CRUD operations.
Why we need an OData Service?
Advantages
Limitations
Here is a little quick reference guide that explains these bearing codes in detail.
(2 Min Read)
Lets use a 6309 2Z/C3 as an example:
S 6302 2RS
^ ^^^^ ^^
Prefix Code Suffix
Prefix:
Code:
(6)902 - This first number relates to the bearing type
1-Self-Aligning Ball Bearing
This kind of ball bearing has a spherical outer race, allowing the axis of the bearing to "wander around". This is important because misalignment is one of the big causes of bearing failure.
2-Barrel and Spherical Roller Bearings
3-Tapered Roller Bearing
4-Deep Groove Double-Row Ball Bearing
5-Axial Deep Groove Ball Bearing
6-Deep Groove Ball Bearing (Single row)
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| Deep Groove Ball Bearing |
7-Single-Row Angular Contact Bearing
8-Axial Cylindrical Roller Bearings
6(3)09 - This second number relates the bearing series, which reflects the robustness of the bearing. As you go up the scale below from 9 to 4 the inner and outer race thickness will usually increase along with the ball size, this will be to help cope with extra load.
63(09) - The 3rd and 4th digits of the bearing number relate to the bore size of the bearing, numbers 00 to 03 have a designated bore size depending on the number.
*Note: Numbers over 03 simply have a bore size which is 5 times that of the 3rd and 4th digit.
Suffix:
The standards of internal clearance that bearings are manufactured to are quoted by a C then a number or for standard clearance bearings are denoted to be CN clearance which is never stated and places the bearing between C2 and C3 Clearance.Standard bearings are what are known as CN clearance but this is never stated in the bearing number thus 6205CN would normally be stated as just 6205.
C3, C4 and C5 bearings are bearings that have an additional internal radial clearance to cope with high speed environments where excess heat is generated. They are not suited to environments where critical alignment is required from the onset e.g. Where blades and cutters are set up to each other. Applications like motorcycle wheels or bicycle wheels do not require C3 rated bearings.
Unless the bearing you are replacing specifically says C3 on it then you should not replace it with a C3 bearing, C3 Bearings are loose to the feel from new and often people complain at the quality of the bearing being poor and having more movement than the one they are replacing. C4 and C5 are even looser still than C3 clearance bearings.
Let’s start with the name — ‘festoon’ is a word that often refers to something suspended in a curve between two points.Simply put, festoon cable is a flat portable cord.
This may help in remembering common applications for festoon cables; they are typically used in cranes, hoists, and other suspension applications.
What is the construction of festoon cable?
Festoon cable is made of finely stranded bare copper conductors at its very core. The size of this cable ranges from 4/0 AWG to 16 AWG, and features either PVC insulation and jacket or neoprene insulation and jacket. The PVC version of this cable comes in black or yellow, while the neoprene is only available in black.
The neoprene version is more flexible than PVC because its conductors can have a higher strand count, meaning it can be used in continuous flexing applications.
Even though these versions vary slightly, they’re still similar. They both have small bending radii, contributing to each cable’s flexibility, and these cables still have many of the same applications.
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| Domestic Wiring Conduits & Junction Box |
