Archives for January 2015

Pivot Frame Wall Rack Preferred by Contractors?

The 4U Pivot Frame Wall Mount Rack makes network equipment installation and maintenance easy for installers. Its pivot feature allows the rackmount frame to swing down and stop at 90 degrees, giving installers full access to the rear of equipment. Even when in the open/down position, the rack can withstand the force of punching down multiple connections – a feature especially helpful when installing patch panels. The Pivot Frame Wall Mount Rack is built with a 12″ depth making it suitable for network and telecom devices such as patch panels, network switches, routers, and more. Its modular design allows you to mount multiple racks above and/or below each other creating a larger rack solution. Ample cable routing is available with the open frame design, as well as the laser knockouts on either side of the rack. Gain full access to all sides of your equipment with the Pivot Frame Wall Mount Rack. Available in a 4U and an 8U, let’s check out the 4U version from our YouTube channel.

Features:

– 90 degree swing down. Pivoting rackmount frame swings down to allow easy access to the rear of installed network equipment. An integrated positive stop prevents the frame from being opened more than 90 degrees to avoid causing damage or strain to your equipment and connections. A latching mechanism securely holds the frame in a closed position

– Open Frame Design. Open frame design allows the rack to be installed over existing equipment without having to remove and re-terminate network cables. Its design and the laser knockouts on both sides of the rack also provide numerous locations for routing cabling in and out of the rack.

– Cable management. The rear lacing panels on either side of the rack allow for excess cabling to be secured with the use of Velcro and cable ties

– Easy to Install. Rack ships completely assembled making installation easy.

– Heavy Duty. The steel construction makes the rack capable of supporting up to 75 pounds of network equipment in both the open and closed position.

So as you can tell this is a cool rack, if you want more info and want to order the pivot rack visit Discount Low Voltage.com

When would I need an Amber colored lens?

We recently got our stock shipment for Greenlee Safety Glasses and I noticed a few different types of colors for the lens. Let us take a look at the Yellow contrast Amber lens.

This color lens absorbs Blue and Ultraviolet light and is best used when sharpness, acuity and contrast are needed and to block high intensity blue lighting such as UV and in Curing Operations.

– Filters out hazy light that is hard on the eyes
– Good for working outside at Dawn and Dusk
– Excellent for hazy, overcast or foggy days
– High Intensity tint for maximum sight performance during low light driving

Recent studies have shown that too much light and especially Blue light, suppresses our natural sleep hormone melatonin. Wearing Yellow glasses for an hour before bedtime will block enough of this light to prevent your melatonin from being suppressed letting you sleep quickly and easily. Other studies have mentioned that the display on a computer, TV, phone, monitor, pad and video games have an excessive amount of blue light so wearing this color lens will also help those who find it hard to unplug.

As I mentioned this stock shipment included a few different glasses, for example safety glasses that fit over your prescription glasses.

We got a handful of different glasses, check out our YouTube channel for a video on them all and they’re all very inexpensive so order a pair!

What are Power-Limited Fire Alarm System Cables

Currently there are three types of power limited fire alarm cables in use but before we get to those let’s touch on National Electric Code (NEC) article 760.

NEC Article 760 covers the installation of wiring and equipment of fire alarm systems including all circuits controlled and powered by the fire alarm system. These systems are defined in the NEC as the portion of the wiring system between the load side of the overcurrent device or the power limited supply and the connected equipment of all circuits powered and controlled by the fire alarm systems.

To comply properly with article 760, selecting the right cable for your fire alarm installation sounds like half the battle. Let’s check out the first of our three cables.

1) Type FPL – This type of power-limited fire alarm cable is listed by the NEC as being suitable for general purpose fire alarm use. This list “excludes” installation in riser, ducts, plenums and other space used for environmental air unless the cable is installed in conduit. All FPL cables are listed as being resistant to the spread of fire and must pass both UL test 1424 and the vertical flame test UL 1581.

2) Type FPLR – This type of cable is listed as being suitable for use in a vertical run in a shaft or from floor to floor. All FPLR cables are listed as having fire-resistant characteristics capable of preventing fire from traveling from floor to floor. Riser cables must pass both UL test 1424 and vertical riser test UL 1666.

3) Type FPLP – The FPLP rating is suitable for use in ducts, plenums and other space used for enviromental air. All FPLP cables are listed as having adequate fire resistant and low-smoke producing characteristics and must pass both UL test 1424 and UL stiener tunnel test 910.

Here’s a quick look of a FPLP cable from our YouTube Channel.

Now that you have a better idea on which cable may be a better fit for your installation let’s check out section 760-71 of that National Electric Code that specifies where Power-Limited circuit conductors are to be installed.

– Installed in raceways or exposed surfaces

– Protected against physical damage

– In metal raceways or rigid non metallic conduit where passing through a floor or wall to a height of 7 feet above the floor, unless adequate protection can be afforded by the building construction.

– In rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit or electrical metallic tubing where installed in hoistways

These cables are power limited for 300V and power limited is inherently limited by the power supply of the transformer and other power supply devices. You’ll also notice that some cables offer a shield for protection against interference created from other cables or other electronic/electrical and mechanical devices and the shield is a 100% Aluminium foiled wrap.

If your new to fire alarm cables this is a good start and you should read the entire NEC article 760 so your install is correct the first time.