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When i switch on power just says protect - Kenwood KDC-W3037A CD-receiver, 4X50W MP3/WMA/CD-Receiver CD Player

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When and How Should a Surge Protector Be Used on a Fixed Switch?


Common Causes of Lightning Strikes
  • Outdoor network cables or power cables are routed overhead.
  • A switch is deployed outdoors but is not properly grounded.

Damages of Lightning Strikes
  • If power cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn the power supplies.
  • If network cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn interfaces of the switch.
When a switch undergoes lightning strikes, overvoltage is induced by lightning on network cables and transmitted to interior of the chassis. The surge protection measures, such as lightning rod and chassis grounding cannot prevent the damage. Therefore, surge protectors or surge protection circuits are recommended.

Surge Protector Use Precautions Take the following precautions to protect a switch from lightning:
  • Ensure that the ground cable is connected to a ground bar or a ground point on the cabinet.
  • Avoid routing cables overhead in an outdoor environment. Bury cables underground or route them in steel tubes.
  • To protect network interfaces against lightning, use 8-line surge protectors (or Huawei certified 4-line surge protectors).
  • When installing a network interface surge protector, connect the IN end to terminals and the OUT end to network interfaces of the switch.
If a fixed switch is installed in a network box, follow these instructions:
  • Connect the ground cables of the switch and surge protectors to the ground bar in the network box.
  • The maximum length of a ground cable cannot exceed 40 cm, and a length of smaller than 15 cm is recommended.
  • If the network box is located outdoors and power cables are routed aerially over a long distance (more than 300 m) to the network box, it is recommended that you install a power supply surge protector in the network box. The decoupled power cable must be at least 3 m long
S2300 Switch Thunder link com

Dec 08, 2016 | Office Equipment & Supplies

1 Answer

Where does a Protection Wire Loop,Located?


as you can see on the diagram this "LOOP" is exactly what it says it is , a loop of wire that carries power thru all the safety limit switches to finally the engine run relay , just follow the wire hooked to each safety switch you'll see it 4 sure , But I will say its my experience that ive only ever found one machine with a broken wire harness(and it was obvious) , its most always a switch (bad or not set) if I were you id follow power thru circuit (switches) with a simple 5 dollar test light 1st

Dec 01, 2015 | Craftsman Garden

1 Answer

Have b/r/w coming in....b/w go to old duplex outlet...black from outlet to switch..red direct to light switch...want to replace duplex with gfci and add a two switch device, one switch controlling existing...


Hi Augie, I'm an electrician and can help you with this problem.

First, a couple of notes. You must provide GFCI protection for a fixture (light, fan, etc.) in a shower under any of the following conditions: 1) If the manufacturer specifies this protection in this location (nearly every fan in a shower requires this protection), 2) If the local / state electrical code requires it (the National Electric Code does not have such a requirement) and 3) If the local wiring inspector requires it. You can argue with the inspector if there is no local / state requirement - but is usually not worth the effort.

Next, cautionary notes: Nuisance tripping of GFCI devices have nearly been eliminated in newer fixtures and small motor loads. Some older fluorescent fixtures and larger motor loads may cause some trouble - but that's about it especially if an inspector is requiring the protection (this happens pretty often). If a newer light fixture is tripping a GFCI device - something is wrong. This should be fully checked out before powering it again. There is a very real potential for shock or burns under the right conditions. Use extreme caution here. Maybe a new fixture is in order??

Finally, to your question. Most GFCI outlets have LINE and LOAD terminals. This means that anything connected to the LOAD terminals will have the benefit of GFCI protection. The line terminals however, are not protected.

If you connect the circuit that you do NOT want to have GFCI protection to the wires that will be connected to the LINE terminals, no GFCI protection will be afforded to them.

The circuit that you DO wish to have GFCI protection should be connected to the LOAD terminals. Since you can not secure two wires to a terminal, you will need to connect a short length (8") of insulated wire to each of the line terminal screws (silver and gold screws) and connect the other end to the wires that supply power to this GFCI outlet *and* the wires that will provide non-GFCI protected power to the light fixture through the switch; with wirenuts.

Basically, the jumper from the outlet to the switch can not come from the LOAD terminal - instead it must come before the protection - from the wire that brings "hot" power to the LINE terminal side. The same holds true for the white neutral wire that connects to the fixture; it can not come from the LOAD terminal - it must come from the wire that brings "neutral" power to the LINE terminal of the GFCI outlet.

I hope this helps and good luck! If you have more questions - ask away.

May 07, 2012 | Electrical Supplies

1 Answer

My Yamaha SW118 keeps cutting out (volume reduces to v low level) even when driven by 500W amp. Doesn't seem to be the amp but not sure if the speaker has it's own internal protection. Can anyone advise?


Poly Switch
All full-range loudspeakers are fitted with a self-resetting
poly switch that protects the high-frequency driver from
damage caused by excessive power.
If a loudspeaker cabinet loses high-frequency output, immediately
remove power from the unit and wait for two to three
minutes. They should allow the poly switch to reset. Reapply
power and check the performance of the high-frequency
driver before continuing with the power reduced to a
level that does not cause the poly switch to interrupt the signal.
On the SW115V/SW118V/SW218V sub woofer, the Poly
Switch protects the woofer and a similar routine should be
followed if its output is lost.

Aug 29, 2010 | Yamaha SW118-IV 18" Subwoofer Speaker

3 Answers

Protect push power


audio amplifier IC fried need to be replaced

Jun 01, 2010 | Sony MHC-GX555 Mini Hi-Fi System Shelf...

1 Answer

Amp pulses from power to protect


check it without the speakers if they go to protection,and if not check the speakers

May 27, 2010 | Power Acoustik PS4-800 Car Audio Amplifier

1 Answer

"PROTECT" displays after I switch ON the power.


there is short inside, usaull with copacitors u might want to have it looked at

May 27, 2010 | Onkyo TX-DS787 Receiver

1 Answer

Hi. I returned from vacation and turned on my power strip and monitor, tried to start my emachine t5026 computer and got nothing. the power light on the back of the power supply is off. If I unplug or...


Your Power supply is most likely dead.

A power strip is not sufficient protection against black outs, brown outs, power surges and other electrical interruptions that occur in the house. Many PC components are very sensitive to fluctuations in power and power supplies often are among the first casualties when a serious problem occurs.

To protect yourself against these common power issues you should invest in an Uninterruptible Power Supply or UPS. A UPS is basically a battery backup that will provide power when brown-outs or black-outs occur and will protect the delicate electronics in your PC. You can purchase them at most stores that sell computers and components.

Nov 10, 2009 | E-Machines Emachine T5026 power supply **...

1 Answer

Amp switches from power to protect over n over


Hello ryan_waslike,

There's a short or a ground somewhere on the system.

Start by checking your wiring and make sure there are no shorts and that there isn't any insulation rubbed off allowing a wire to come in contact with the vehicle metallic body or frame. Then disconnect the speaker and see if the amp will power up without going into protect. If it does, the problem is in the speaker or speaker wiring. Find and correct the problem and power everything back up.

Hope this helps.

Aug 02, 2009 | JBL GTO 301.1 Car Audio Amplifier

1 Answer

Protect push power


hi, everytime i switch on my sony hi fi it the display screen says protect push power. It won't let me do anything not even put cd's in. If you could help that would be very much appreciated.

Jun 12, 2008 | Sony LBT-XGR6 CD Shelf System

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