There are several different types of medium voltage earthing systems. These systems can be differentiated by using the neutral point connection method. They are different in the way that they operate and each of them has its own pros and cons. These earthing systems in medium voltage include the likes of:

The functioning of each differs from the other. They also have various applications. Let’s have a look at each system at a time:

In this one, there is no electrical connection between the earth and the neutral point except for the devices that are used for measurement or protection. There is high impedance inserted between the earth and the neutral point. There is no switching on occurrence of the first insulation fault. It is therefore important to carry out permanent insulation monitoring, show the first insulation fault and locate and clear the first insulation fault.

Pros and cons: The advantage of using this one is that it provides services by tripping only when the second fault occurs which is subject to the capacity of the network not leading to a high earth fault current which would be dangerous for people when the first fault occurs. It has its demerits. There is the risk of high internal over-voltages. Insulation monitoring is also compulsory as well as the presence of maintenance personnel who will be monitoring and locating the first fault during use.

It is also known as direct earthing. It has a connection between the earth and the neutral point. Upon first insulation fault occurrence compulsory switching must be done. It is significantly different from the above mentioned unearthed neutral.

Pros and cons: This system reduces risk of over-voltage occurring and also authorizes the use of equipment with a normal phase to earth insulating level. On the other hand, there is mandatory tripping upon occurrence of the first fault. The touch voltages developed are very high and this poses a high risk for the personnel while the fault lasts. Differential protection devices must be used so that the clearance time of the fault is as short as possible.

This system requires a resistor to be inserted between the neutral point and the earth. It is also known as limiting resistance earthing. Their operating technique is quite straightforward. Switching must be done upon the occurrence of the first fault.

Today begins our newest series: Weekend Warrior. It’s part of our quest to bring our customers unique products and offer creative ideas for DIY projects around the house. This week we’re tackling one of our most innovative new products: The NETBRIGHT™ Wireless Motion Sensor Networked Spotlights. 

My front entrance with existing floodlight

The back entrance of my home … not so much…

We’ve recently added four new CAN Bus LED festoon bulbs. These 6418, 6451 festoon bulbs are designed to communicate with vehicle CAN Bus computer systems and prevent “bulb out” error messages. They can be used for numerous applications, such as map lights, dome lights, vanity lights, trunk lights, and footwell lights.

Powerful cool white LEDs are mounted to one side of the bulb’s printed circuit board for direct illumination without wasted light, and an LED-cooling heat sink is incorporated into the back of the board. These error-free bulbs are designed to last 25 times longer than incandescent bulbs.

FAQ post.

Some electrical problems are harder to detect than others. That’s why, when trying to diagnose home problems, one of the best ways to quickly get to the bottom of the situation is with an infrared thermographic inspection. But what are the benefits of this inspection? Let the experts at Kolb Electric help!

When combined with traditional home inspection techniques, the infrared thermography inspection method reveals considerably more about your house than can be seen with conventional inspection tools. Some things our infrared thermography inspections have detected include:

The media room is perhaps the most lived-in area of your home.  Whether you are watching TV or reading a book, the lighting should be comfortable, energy-efficient and beautifying.  Tune in to a picture-perfect setting with lighting tips from Capitol Lighting’s professional consultants.

1. Track and Recessed:  General or ambient lighting is a must in any room, but it is especially important in a multi-functional space such as a den or media room where there will be a wide range of activities that call for specific light settings.  Overhead lighting should be installed as part of the initial room design.   Oftentimes, a standard grid lighting pattern does not work well with your seating and furniture layout, so it is best to draw up your lighting design in the initial stages of planning.

NOTE:  In general, recessed cans should be installed 30 inches away from the wall and 4-5 feet apart.

Track heads, recessed and/or rail lights should be strategically located so as not to create glare or cast unflattering shadows upon individuals in the room.

Rail lighting from WAC Lighting highlights artwork;  hanging pendants provide soft ambient illumination and artistic accent light.  Rail and track lighting are highly versatile and allow for easy adjustments if you decide to change your decor.

2. Wall Lighting: Wall lights work well in a media room as they expand the space and provide an evenly distributed balanced illumination.

Image from HGTV.com “Must-see Media Rooms”

“Jaxon” wall lighting from Troy Lighting, available in a variety of color options

3.  Portables:  From sturdy reading lamps to decorative table lamps, portables are a useful addition to the multifunctional media room.  They provide individualized task light, as well as general illumination throughout the room.

Room design by Sandra D’Amata International

Ambience table lamp (shown above), Frederick Cooper “Script Reader” floor lamp and Minka-Aire’s “Great Room” fan from Capitol Lighting

4. Control Systems:  Dimming and automated control systems are a must for the media room.  Even if you have programmed your lighting controls into your Smart phone, wall switches with a variety of room settings and dimming capabilities are a good idea and are available in a choice of colors to complement your rooms’s decor.

Dimmer switch from Kichler Lighting

5. Special Considerations:  LED bulbs and LED light fixtures are suitable for media room lighting designs, just be careful to choose all your light sources with the correct color rendering, color temperature and shielding. Look for LED light sources that are dimmable and in warm (2700K)  color temperatures. *

LED torchiere floor lamp from Holtkotter

* Solid State Lighting and LED light sources are being refined so that predictable color rendering and color temperature will be more visually accurate.  A new metric to measure LED illumination is in the works:  The Color Quality Scale (CQS) will help to identify the visual characteristics of LED light sources more clearly, but right now–a bit of trial and error may help you find LED light sources that are complementary to your media room’s decor.

3 Keys to Remember:

*  Avoid having sharp areas of contrast between dark and light–illumination should be evenly dispersed with slight variations that allow your eyes to transition from reading a book, conversing with friends or watching  TV.

* Make sure lighting/fan controls are easily accessible–opt for a remote control system in addition to wall switches.

* Go for the most energy-efficient light sources, but do not sacrifice the overall look of your room.   If you are not using fluorescent or LED light sources, opt for eco-halogen or top quality incandescent bulbs in portable light sources.