Boiler Water Sample Cooler

Hot Products

NDT 2.25MHz Small Phased Array Sensor for Non Destructive Testing

Without Holding Brake Plug Set MR-CCN1 Motor Part For Servo Amplifier

No Oil Seal Servo motor HG-MR73B Mitsubishi For Computer Embroidery Machine

Built In Pulse Stepping Motor Driver Mitsubishi RD-323M50H For Overheating

Open Collector Output Type Motor Drives QJ71E71-100 For Pulse Control

7.5MHz Piezoelectric Transducers For Castings Inspection

DC Input Moudel Positive Common Terminal Type QX42 Model Isolation Method

Programmable Controller Mitsubishi Q312B Q Series Module Extensible

DC Motors Fully Closed Self Cooling HG-KR053 Servo Moteur AC For Lettering

NDT Phased array transducer for Testing Wide Thickness Range Coverage

FAQ

Context:Unrated electrical equipment in the dust handling equipment and area could act as an ignition source, which would result in a fire or an explosion for the dust handling equipment or rooms.

It refers to both the equipment and the area.

I have a hanging, pull-string electrical light in my attic. This is very standard stuff. I would like to purchase an electrical device that will screw into the electric light and give me an electrical outlet. Think of this as a device with the base of an electric light bulb and an electical outlet instead of the bulb. I thought I saw one in a hardware store 20 years ago, but I have no idea if this product still exists. I can not think of what it would be called with a technical name when searching for one on the Internet.My business application is to be able to plug equipment into my attic rather than running the cord into the main house.

It's called a light socket adapter. There are many places that sell them. Take care not to overload the low-current lighting circuit though !

I measured it with a CRO in the physics lab and I was wondering what could be its source

That is a period of about 62 hours or 2.5 days! Are you sure you measured this with an oscilloscope, or does CRO mean something else to you? Maybe the motion of the planets, earth, moon, etc. I don't know? Do you mean a period of 4.5 microseconds? That would be 222kHz perhaps EMI from a computer, other electronic gear, short wave radio, etc. If you can clarify, I might be of more help. Edit: OK; I have a couple of ideas, but it can be DIFFICULT to find. I spent a long time trying to track down the source of 70MHz in my lab. Turns out there is a TV station (channel 4) transmitting about 1 mile away. Channel 4 occupies the space between 67.31MHz and 71.75MHz. 222 KHz has a wavelength of about 1350 meters. It takes a pretty big antenna to launch that as a traveling wave so I'm going guess its a near field source. A good way to look for it is to make a small loop antenna with a few turns of magnet wire (maybe a few 10s of cm in diameter) and hook it to your oscilloscope. Walk around with it putting it near any and all electrical equipment that is in or near your lab. Make sure to change the orientation of the coil when you are moving around. You are basically playing a game of hot and cold. Try to maximize the signal and in theory you should be near the source. Also, be suspicious of the lights. I know their source is 60Hz, but some electronic ballasts for fluorescents run at a pretty high frequency, at least 10's of KHz, you could be seeing a harmonic. Just try flipping the lights on and off looking for a change in amplitude of the signal on the scope. If this doesn't find it, then perhps it is far field? I don't know of any commercial braoadcasts at this frequency though. The low end of AM radio is around 500KHz. Maybe you have an active Ham radio operator in the neighborhood? I wouldn't think he would be transmitting all of the time though is this 'noise' always present? Hope this helps. Let me know if you find it. Dave

I am looking for electrical equipment that are commonly used in industrial plants, power plants or substation. I was hoping anybody here could help me.

motors transformers switchgear motor control centers large breakers molded case circuit breakers disconnect switches load carrying cables signal and control wiring relays terminations etc.

how we can justify or design the voltage rating of any electrical equipment. some motors are 415 v, others are 11kv, 33 kv, motors. ofcourse the current rating will change as per voltage rating. but at what stage of power rating this voltage will change as any standards.

Motors are designed for the lowest voltage that is practical based on the wire size required at a given power level. Wire size is an issue from the standpoint of the wire feeding power to the motor and the wire used for the coils inside the motor. Since it is inconvenient for users to have factories and other facilities wired for several different voltage levels, there is a market demand for motors designed for higher voltages than would be necessary based on wire size. Therefore, there is considerable overlap of the motor power ranges offered for sale at any given voltage level.

I'm considering buying an assortment of electrical equipment whilst on holiday in the US. Will they work in UK? Thanks in advance1) TV. Gut feeling is that the digi tuner (NTSC/PAL) will be different and its going to be a nightmare with the actual power.2) Nintendo DS. I think i will be ok on this one as games are not region enabled. Charger maybe an interesting one.3) Cable modem. No idea :) but i need a cable modem for home.4) is there such a thing as a DAB radio in the US? I saw some really strange radio setups but no DAB.5) Digital Video Camera. Makes to avoid for the change to UK?Thanks again for reading and taking time to reply.

I would not buy ANYTHING with a video output. In the US most video-related equipment supports only NTSC. This takes care of TV, DS, and Video camera. I doubt the cable modem will also work. US has HD radio, which will not work either.

I have a 1992 F-150 with a 5.0 302 in it. Last week she started going haywire. My battery wasn't holding a charge, my spedometer was bouncing up and down and my mileage read was coming in and out. I had the diagnostics test done from Auto-Zone that tested your battery, alternator, and starter. They said that my alternator had low power output but everything else was fine. My dad (he's a mechanic) said I had to replace my voltage connectors on my alternator. We did that and she acted fine for about a week. Battery was holding a charge, no problems at all. A couple days ago, my battery light popped on and the battery is not holding a charge AT ALL. I constantly have to charge it. Any ideas on what the new issue could be?

change the alternator and make sure the belt is good and tight ! your voltage regulator is inside the alternator and it,s acting up !

every electrical equipment is rated in VA or KW(motor) why transmission line rated in Volts though it carry power.

Because voltage is the only thing that remains fairly constant. Even though industry and residential pull off that transmission line, the voltage is and Hertz is maintained for the sake of equipment that depends on a constant voltage. The current in the line fluctuates highly , depending on how many people are drawing on it at any instant