When 2 pieces of AC powered equipment are connected together there is potential for a ground loop. A ground loop is usually heard as a "hum" through the speakers of the PA or amplifier. For instance, if you connect your amplifier to a mixing board via the XLR Direct Out jack or Line Out jack, there is potential for a ground loop if both pieces of equipment use earth ground as their signal ground.

This is a term given to an arrangement which connects one of the signal leads, usually ground, at the transducer and that same lead to ground at the measuring instrument. If a voltage exists between those two points, a loop is formed.

We do not recommend using "cheater plugs" except for testing the absolute polarity of the component. Once the absolute polarity of the component is determined, it is advisable to change the polarity ( if necessary) inside the male IEC of the component. The use of "cheater plugs" would degrade the performance of our power cables. Ground loop is usually caused by the difference in electrical potential between component grounds.

Both loops extract heat from the surrounding earth (soil or water) for transfer into the heat pump. Temperature changes in water temperature can be more dramatic than changes in soil temperature (eg: if your water loop were located near a glacial stream) and water levels are more prone to change (eg: drought conditions).

Current in the signal lead produces a voltage drop which adds to the transducer signal. Since it is likely to vary there is no way to compensate even if it were somehow possible to measure at some particular time.

The length of pipe depends on two factors: the amount of heat required in the building (the more heat required, the larger the heat pump and the longer the loop must be) and the thermal transfer characteristics of the soil (dry light soil with entrained air can require three times the amount of loop to provide the same heat as wet, packed soil). Design software will calculate the amount of pipe for a specific site.

The CSA standard does not allow pipe to be placed near septic tanks or hydro lines, and must be a minimum distance from neighbouring property lines.

Most contractors prefer to retain control over the entire job to ensure compatibility of all sections, but the digging of the horizontal trench (and backfilling) is one area that could reduce costs if done under the guidance and direction of the installing contractor.

The CSA C448 standard directs that the minimum depth is 4 feet; the former 445 standard required 2 feet. The objective is to install the loop as far below the frost line as possible. Many provinces require safety measures when a trench is more than six feet deep, so most contractors do not exceed that depth in order to reduce costs.

Each pipe extracts heat from the nearby soil, so separation should be as wide as possible. The CSA standard demands at least 10 feet between sections of loop, which can be reduced under certain conditions. A system relies on a constant, low level of temperature for the building, and any sudden increase in heat demand will cause the supplemental backup heating unit to activate. Setback thermostats are not recommended for use with an EE system.

The CSA standard allows only high-density polyethylene pipe, with the three most common diameters being 0.75", 1.0" and 1.25". Sections of pipe are heat fused and many suppliers offer a warranty of 25 years. The resin in this pipe is the same used in the pipe used to transport natural gas. This plastic does not degrade under sunlight and is warranteed not to fail. Most units include all pumps and controls, but it may be the responsibility of the contract to obtain some individual components.

Well water/stream water/river water/sea water pumped directly through the heat pump, using a suitable filter to prevent ingress of dirt and abrasive particles.

A ground loop Isolator may be necessary if you are supplying audio from a device that runs on vehicle power. You can really only tell if your application needs a ground loop isolator by comparing how the audio source sounds when the vehcile is running versus how the audio source sounds when the vehicle is parked, change the ignition to ACC selection to test audio when powered only by the vehicle battery.

A ground loop occurs when a piece of equipment or a system is connected to different grounds (e.g. AC and coax or data lines). When the data lines, coax lines or AC lines are not connected to the same grounding point there can be a difference in voltage between them when they enter your electrical equipment. The differing ground lines are interconnected within the system components. (TVs, Amplifiers, Receivers etc.

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Ground-level ozone can be harmful to people and the environment. Levels above the health-based standards established by the U.S. Environmental Protection Agency (EPA) are known to cause chest pain, coughing, throat irritation, and congestion, and may also worsen bronchitis, heart disease, emphysema, and asthma. Healthy people as well as those with respiratory problems experience breathing problems when exposed to ozone.

Typically for the 9kW unit, you will need approximately 300m of pipe. Standard PVC pipe 20mm diameter is sufficient. This can be purchased as 150m rolls. Typically in warmer climates you should lay 1m of pipe per 40watts of heatpump (heating) rating. In colder climates, 1m of pipe should be laid for each 30watts of heatpump. The pipe should be laid between 2 and 4metres deep. If space is limited, it is possible to lay pipes at different depths in the same trench - eg 4m/3m/2m.

No. People tend to think that "Ground is ground." The reality is far from that. Depending on soil conditions, the resistance of an 8 foot ground rod can be from 20 ohms or so to 1000 ohms, or even more in rocky or dry earth. The resistance of a short (say 2 foot) rod would be about 4 times larger- say 1000-4000 ohms! This can be easily measured with an ohmmeter. Lightning currents coming into the loop from direct lightning can be several thousand amperes.

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A Listeria is only a problem in ready-to-eat products that will not be heated before consumption and that have a fairly long shelf-life, allowing Listeria to grow to high numbers. Fresh ground beef is not a hazard since the competing microflora slows Listeria growth and the shelf-life is too short for extensive growth. The primary people at risk to Listeriosis is immunocompromised or immune-stressed individuals are susceptible to serious illness from this microorganism.

The safety issue came about because the original grounding post had a through thread. For new instruments, the design of the grounding post has been changed from a through thread to a closed thread end. This eliminates the potential safety hazard. No. The AFG3000 Series instruments are completely safe when properly grounded as instructed in the user manual. The safety notification is a precaution to alert users of the potential risk that may result from improper use.

It is unlikely that a certified loop installer would make any mistake sinece he/she is trained to fuse sections of loop. The CSA standard requires that a system be tested to a pressure above normal operating levels, to determine if there are any leaks or problems which can be corrected immediately.

The size of the ground loop depends on the size of system, the design of the ground loop, and the soil conditions. For a vertical loop, a rough estimate for planning purposes is one borehole of 60 meters (200 feet) deep per one ton (12,000 btu) of heating load. Each borehole should be 3 to 5 meters (10 to 16 feet) apart. The boreholes can be placed to fit in available land, they may be drilled in a row, a rectangle, or other shape that fits into the landscape.

The circulation pump for the ground loop is not included in the heat pump (however, an internal pump is provided to circulate the heated output water). We recommend that the pump should produce a flow rate of at least 0.25litres/second and be capable of working with a 10m head. Bearing in mind the resistance of the ground loop, this generally requires a circulation pump of at least 250watts electrical consumption.

how can i convert the Tonnage into flow rate that is tonnage into gallons per minute i mean how can i do the calculation I have an XR90 heating unit currently installed in my basement that heats the first floor of my home. Currently the unit has 5 ducts running out of the unit and one cool air return. I was wondering if I tapped into exhisting ducts to heat my basement and added a cool air retun would I be able to be able to heat both levels.

What engineers refer to as 'ground loops' are caused by several factors. A 'ground loop' is a noise that is often created when two pieces of electrically charged equipment are connected together and their differing ground reference voltages interact. This is often unpredictable, whereby the system noise may be 'acceptable' in one venue and be absolutely horrendous in another. Transformers isolate the two devices by converting the electrical current into a magnetic field and then back to current.

Surface water can be contaminated easily from pollutants that are soluble as well as from pollutants that are not soluble in or partially soluble in water. Sources of surface water contamination are:

induction loop system is a loop of wire that is installed around the perimeter of a listening area and it emits a magnetic field. More information on loop systems...

I am confused about allergy vs. intolerance. I understand that our children may be sensitive to corn, soy and other foods as well as gluten and casein.