Accessory current clamps can expand a multimeter’s flexibility and measurement capabilities by allowing it to measure up to thousands of amps. The clamp accessory reduces the actual measured current by a fixed ratio. This means that the current maximum is now limited by the clamp instead of the multimeter.

The following discussion focuses on the most common types of current clamps used with digital multimeters (Digital multimeter):

1. AC only with a milliamp output like the Fluke i200, i400, 80i-400, 80i-600A or i800
2. AC/DC with a millivolt output like the Fluke i410 AC/DC Current Clamp AC/DC Current Clamp, i1010 and 80i-110s

Note: This is not a complete user guide. Make sure to read the safety and usage information contained within the clamp’s instruction sheets.

AC clamps: Fluke i200, i400, 80i-400 or i800

The i200, i400, 80i-400, and i800 are current transformer-type clamps that have an output of 1 milliamp ac per amp ac. This is a 1000:1 ratio. Additionally, they also have banana plug connections. However, take note that these clamps do not measure dc current.

To use these clamps with a Fluke Digital multimeter, the meter must have a milliamp input jack. Plug the black output lead into the meter’s common jack and the red output lead into the meter’s milliamp or mA input jack. Set the meter’s function switch to read ac milliamps.

Furthermore, place the clamp jaws around only one conductor of the circuit. Clamping around both the line and neutral conductors (like a line cord) at the same time will cancel the current flow reading. If there is currently flowing in the circuit, the milliamp reading in the display will be the actual current flow in amps.

The reading on the Fluke 87V Industrial Multimeter display (15.86 mA ac) corresponds to a true circuit current of 15.86 amps ac. The reading on the Fluke 289 True-RMS Data Logging Multimeter display (225.32 mA ac) corresponds to a true circuit current of 225.32 amps ac.

AC/DC clamps: Fluke i410 AC/DC Current Clamp AC/DC Current Clamp and i1010

The i410 and i1010 are ac/dc Hall Effect type clamps. That is, they contain Hall Effect sensors, and have internal electronics and a power switch. These clamps have an output of 1 millivolt ac per amp ac for ac current measurements and 1 millivolt dc per amp dc for dc current measurements. Again, these have a 1000:1 turns ratio.

To use these clamps with a Fluke Digital multimeter for best results, the meter should have a millivolt range for either ac or dc voltage depending on the current to be measured. And then, there are ac current measurements. For this to work, plug the black output lead into the meter’s common jack and the red output lead into the meter’s V/? input jack. Set the meter’s function switch to read ac voltage or ac millivolts.

Connections for i410/i1010 clamps with a 289 Digital multimeter

The reading in the Fluke 289 True-RMS Data Logging Multimeter display (7.437 mV ac) corresponds to a true circuit current of 7.437 amps ac.

For dc current measurements, here’s what you have to do. Plug the black output lead into the meter’s common jack and the red output lead into the meter’s V/? input jack. Set the meter’s function switch to read dc millivolts. Turn the clamp on by pressing the green power button.

Here’s what you should do for the most accurate dc measurements. With the jaws closed use the “zero” adjust to zero the displayed reading before clamping around the current to be measured. DC measurements only require zero adjustments. Only one conductor should have clamp jaws wrapped around them. If there is currently flowing in the circuit, the millivolt reading in the display will be the actual current flow in amps.

AC/DC clamps: Fluke 80i-110s

80i-110s is also an ac/dc Hall Effect Type clamp. This is a dual-range clamp with an output of either 10 millivolts or 100 millivolts per amp ac for ac current measurements or 10 millivolts or 100 millivolts per amp dc for dc current measurements. Use the 100 millivolts per amp position for accurate current measurements up to 10 amps and the 10 millivolts per amp position for current measurements exceeding 10 amps but less than 100 amps

initially, this clamp was originally designed for use with an oscilloscope and terminates with a BNC-style connector. To use it with a Digital multimeter, add a PM9081/001 BNC to the dual banana adapter. Therefore, for best results, the Digital multimeter should have a millivolt range for either ac or dc voltage, depending on the current to be measured.

Meanwhile, for ac current measurements, plug the black output connector into the meter’s common jack and the red output connector into the meter’s V/? input jack. Set the meter’s function switch to read AC millivolts or AC voltage. Finally, turn the probe on by sliding the switch from “Off” to the appropriate range position depending on the current.

To know more of our fluke Digital multimeter products, visit our website at https://presidium.ph/product-category/products/fluke-industrial-group-tools/digital-multimeters/

Intermittent faults are notoriously hard to find. If you don’t know when they’ll occur, you need some form of data logging. To put it simply, intermittent faults are malfunctions of devices or systems caused in intervals. In addition to this, you may also need to transfer the data remotely. So, measuring instruments should be versatile and intelligent with a Wi-Fi connection, and may need to read two external sensors.

Intermittent Faults: Overhead and underground utility cables

One of the users is an energy utility with extensive overhead and underground cables. Like the vast majority of energy utilities, they need to know the overhead cable power quality. Alongside the faults found in any other network, these are very sensitive to all kinds of weather phenomena.

Moreover, strong winds can cause wires to “gallop” and touch each other. That can cause voltage dips or short interruptions. Wires can then or at other times touch trees which can cause flashovers or even fires. Pylons can blow down, broken branches can damage cables, and driving rain or hail can penetrate electrical joints.

This utility’s end customer was complaining of flickers and voltage fluctuations. The maintenance department measured power quality parameters on the overhead power lines. Crucial measurements because these parameters give you some of the most important top-level fault-finding information.

Intermittent Faults: Excessive flicker and voltage dips

The measurements verified that flicker and voltage dips exceeded EN50160 limits, but the cause was not clear. One possibility was the wind making tree branches either touch the wires or shake a wire loose at a poor connector. Your first thought might be to send someone out to check, but long lines are expensive to test that way. Then again, a windy environment is ideal for measurements like this. This is because whether a branch hits the line (for example) will depend not only on the clearance but also on the stiffness or flexibility of the tree.

Our Fluke 1748 three-phase power quality logger monitored the wind speed across an anemometer. Importantly for energy utilities, 1748 complies fully with the 3rd edition of the IEC61000-4-30 standard. The logger captures voltage, current, power, energy, frequency, and power factor. It quickly assesses power quality to standards like EN 50160 and IEEE 519. The instrument is rated at 600 V CAT IV/1000 V CAT III for service entrance, substations, and downstream. It stores more than 20 separate logging sessions, and can quickly create reports to confirm the findings.

Results sent over Wi-Fi

A Kirwan INT10 BA® anemometer was fixed to the top of a 230-V supply pole, supplied by the battery to ensure uninterrupted power.

The Fluke 1748 was fitted with a 174x AUX accessory that accepts two inputs, one between ± 10V DC and the other between ± 1,000V DC. The AUX inputs can be freely scaled in software, and the signals can be correlated to each other. That was key for this application and is virtually unique to 1748. The first input was attached to the anemometer, which converts wind speeds of 0 to 60 m/s to a linear output signal of 0 to 10 V. The second monitored the overhead cable voltage.

The instrument software allowed the utility to analyze the results immediately and download the data to a laptop 10 meters away without interrupting data logging. A month’s worth of measurements correlated voltage variations and wind speed. That confirmed the fault caused to be galloping wires, and the problem was quickly found to be worn wire connectors.

Repayment times

Repayment time is possibly the single most important measure of an instrument’s value to our customers. In cases like this, though, it’s difficult to assess: how do you value your customers’ goodwill and how they feel about your service? Let alone the work satisfaction and reputation of a fault quickly solved by your maintenance department.

Reach us through this link or contact us at +632 84590167 / +632 82570795

• Measuring tools: Fluke 1587 Insulation Multimeter
• Operator: Singapore electrical utility
• Tests conducted: Insulation resistance cable test, continuity, voltage

When the electrical transmission is underway and distributed from generation plants to the end-users, it passes through numerous sections of low voltage and high voltage cables. These transmission cables are also used to connect to the secondary outputs of current transformers (CT). They are deployed at both ends of the transmission stations, also known as sub-stations. The Fluke 1587 Insulation Multimeter is the direct action to any electrical transmission cables’ faulty wirings.

To protect critical equipment and prevent the escalation of faults, these pilot cables serve to detect any unbalances between the corresponding pairs of CT. Ultimately, this may affect the entire transmission network. While only one pair of wires is needed to complete the connections, operation, and redundancy, planning calls for a minimum of three functional pairs of wires at any one time.

About electrical transmission.

It is impossible to have a single cable that spans the vast distance between sub-stations. As a result, this can imply a connection of cables. To say the least, such joints are the weakest links in the system. Ultimately, environmental factors can cause faulty joints. One of these factors includes thermal stress and moisture absorption. The failures will show up when current readings taken at the secondary of CT deviate from the proportional primary current readings. Remember, never be complacent with these kinds of abnormalities so it’s always safe to contact someone who knows their way around. Call utility maintenance when these kinds of faults occur.

Meanwhile, maintenance men have to travel to the sub-station at one end to isolate the affected CT and pilot cable at that sub-station. Then they need to travel to the sub-station at the other end to check the insulation resistance of the pilot cable.

While they’re at it, they will check the pair of wires that have been used, as well as all the remaining 4 or 9 pairs of wires in the same bunch of pilot cable, and ensure at least three pairs are functional. As some wires may have permanent damage, there’s actually a way to prevent this. How? With the use of colored cables. Different colored wires are mixed to achieve a minimum of 3 functional pairs. Therefore, the team must verify the exact inter-connect pairs and they term this work as “phasing”.

Thereafter, to prevent abnormality, make it a habit to check insulation resistance. This also goes for “phasing”.

Remember…

In addition, these tests can be mandated by a new extension of cables due to civil engineering works. It’s no secret that time is critical for maintenance men, so the faster the troubleshooting, the better. Moreover, doing these tests in the shortest time possible is a huge plus. Maintenance people find the Fluke 1587 Insulation Multimeter a very versatile tool. Why? This device can perform insulation resistance tests as well as voltage measurements and continuity checks.

For testing of high voltage equipment, cables and switchgear, the team relied on the Fluke 1550B 5 VK MegOhmMeter.

Get your Fluke tool from a trusted source!

Presidium PH is an authorized distributor of Fluke test tools in the Philippines. So if you want to know more about Fuke tools and their functions, visit our website for more info! This is a one-stop-shop for the best test tools in the market! With a wide selection of the best troubleshooting and maintenance devices, this is your one-stop-shop for all your device needs when it comes to choosing the best device for your electrical transmission needs.

You could now buy Fluke 1587 Insulation Multimeter from us! Simply contact:+632 84590167/ +632 82570795 / +632 82515165 or visit our e-commerce site.

Thermal imaging software extends a lot more features and happens a lot easier to utilize than what was accessible in the past. Now, you can connect thermal imaging software on a PC or mobile device. Ultimately, this can establish, improve, simplify, and evaluate images and construct professional-looking reports that you can distribute in email.

Moreover, don’t think that by augmenting images you’re altering the actual data; you’re just modifying how it is presented so that even an inexperienced eye can clearly see anomalies. Basically, this helps expedite decisions and minimize debates.

Choosing Thermal Imagers…

Here are some of the basic rules for choosing thermal imaging software is to make sure it allows you to:

• Process and export images in multiple formats including .jpg, .tiff, .bmp, .gif, and .avi as well as proprietary formats that allow you to access more data for advanced analysis.
• Edit and manipulate images by adjusting level and span, changing emissivity, adding markers, highlighting hot spots, referencing images, and applying color alarms.
• Combine visible light and infrared images and adjust the blend between the two to more easily locate and highlight potential problem areas.
• View and share images live from your camera, your smartphone, or your computer to collaborate with remote team members.
• Remotely control your infrared camera to adjust focus or capture images without touching the camera. This is especially valuable in potentially hazardous areas or tight spaces.
• Create templated or custom reports that you can share in .pdf or .docx formats.
• Perform three-dimensional analysis so you can view infrared images from multiple perspectives to identify additional problem areas and help eliminate false positives.
• Compare images side-by-side so you can see the changes in the same target over time to aid predictive maintenance programs.
• Change color palette to make hot or cold areas more obvious with high contrast palettes or to see subtler differences with a grayscale palette.
• Add text and audio annotations along with additional visible-light images to provide the details you need for thorough reporting.
• Categorize, catalog, or tag images and associate them with equipment to make it easier to track images over time.

Get your Fluke tool from a trusted source!

Presidium PH is an authorized distributor of Fluke test tools in the Philippines. Therefore, if you want to know more about Fuke tools and their functions, visit our website for more info! This is a one-stop-shop for the best test tools in the market!

Receive personalized recommendations from an Authorized Distributor. Contact us now!

+632 84590167 / +632 82570795 or email us info@presidium.ph

Safe and Rugged.

Safety is vital when working with electricity. Strictly follow the right procedures. Wear the proper clothes. Use eye and hearing protection. And make sure you use the right tools. High-quality, fluke insulated hand tools.

Rubber or plastic on the handles is what most hand tools have. That’s not the same as offering protection from electric shock and controlling the possibility of arc faults due to short circuits. That’s what makes insulated tools different.

These hand tools are:

• The most comfortable, ergonomic design possible
• Designed and manufactured in state-of-the-art German facilities in Germany to traditional Fluke quality standards
• Compliant to the global safety standards
• Certified to 1000 V ac, 1500 V dc
• Backed by a limited lifetime warranty
• Available from your Fluke distributor

Get your insulated hand tools from a trusted source!

Presidium PH is an authorized distributor of Fluke test tools in the Philippines. Therefore, if you want to know more about Fuke tools and their functions, visit our website for more info! This is a one-stop-shop for the best test tools in the market!

Shop now for the fluke insulated tools: Insulated Hand Tool Archives – Presidium PH

Get reliable measurements for a variety of electronics, industrial and automotive applications by using Fluke test leads, test probes, and alligator clips. Fluke accessories (specifically test probes) are the number one choice to get the most out of your Fluke test tools and multimeters.

Fluke test leads and probes enhance your ability to take multimeter measurements in different environments. From probe-in-one to modular retractable test leads with alligator clips and probes, and patch cords of various lengths. All test leads are 1.5 m (59 in) long.

Get one from an authentic source!

We’re not going to lie, of course, your Fluke accessories can be stored in other cases or you could probably get some of the test lead and probes from a secondhand source. But still, nothing beats the durability and the performance of new accessories. It’s a sure-fire, good investment especially if you’ll be using them on a daily basis. 

Presidium PH is an official distributor of Fluke accessories in the Philippines. So if you’re interested in purchasing one of these amazing products, make sure to visit our website. You’ll have plenty to choose from to level up your Fluke items. Happy shopping!

Presidium.PH is your go-to source.

Presidium PH is an authorized distributor of Fluke test tools in the Philippines. So, if you want to know more about Fuke tools and their functions, visit our website for more info! This is a one-stop shop for the best test tools in the market!

Reach us through info@presidium.ph or contact us at +632 84590167 / +632 82570795

Personal protective equipment can help keep you safe.

What is personal protective equipment (PPE) and why is it important? According to 85% of electrical workers who participated in a recent Fluke survey, not very. They said they skip wearing proper protective gear because it’s inconvenient. Yet, we know that this protection gear is really your last line of defense to remain safe in an arc flash or arc blast environment. Of course, the best way to avoid shock or electrocution is to stay far away from living components and to only work on dead equipment. Unfortunately, even when taking the appropriate precautions, arc flash and other accidents can still happen. That’s why electrical PPE is your last line of defense to remain safe in an arc flash or arc blast.

The United States Department of Labor’s Occupational Safety and Health Administration (OSHA) and NFPA create robust guidelines and regulations around job site safety. NFPA 70E, the Standard for Electrical Safety in the Workplace, details the requirements and the PPE required for safe work practices. While NFPA 70E standards are not required by law, they were written to help meet the requirements that OSHA does require by law. In order to figure out what PPE is necessary for certain environments; you need to start by conducting a hazard assessment.

What are PPE requirements?

PPE’s are the ideal wear for any job site, especially hazardous ones. Taking a hazard assessment tells you what PPE is required on site. Also, is also the first step toward developing a safety program. It should serve as your foundation for creating a safe work environment. You need to identify the potential hazards in the workplace, both physical and health-related.

Potential health hazards are things like exposure to harmful dust, chemicals, or radiation. Physical hazards can include a broad variety of work areas including, but not limited to:

• Moving objects
• Sharp edges
• Potential for falling objects
• Electrical connections
• Extreme temperatures

As you conduct a walkthrough of the job site, you’ll want to document every possible hazard. The information can be organized later, and the proper PPE is determined to protect employees from each hazard. The job site should also be periodically reassessed to ensure any changes are considered, and the PPE levels set are enough.

Selecting proper PPE

Here are some things to keep in mind after taking the hazard assessment. Firstly, try and remove any hazards you come across to. Keep a hierarchy of control’s in mind as you set up your plan. The National Institute for Occupational Safety and Health (NIOSH) ordered these controls in order from what is most effective to what is least effective in protecting workers’ safety.

1. Eliminate the hazard
2. Substitute less hazardous equipment or materials
3. Engineer controls to reduce exposure or severity
4. Warning, signs, and other communications
5. Administrative controls; including safe work practices
6. Personal protective equipment

If you’ve gone through the hierarchy and come to PPE as the final step, come up with a list of PPE for electrical work. You should follow NFPA 70E guidelines to select the minimum PPE standards for areas you noted in the assessment. Table 130.5(C), or the Table Method of NFPA 70E helps to estimate the likelihood of an occurrence of an arc flash incident in different AC and DC systems and whether PPE should be required.

The table is a minimum required level. It is always a good idea to not just meet the minimum safety requirements, but to exceed standards. OSHA requires many of the PPE categories to meet standards developed by the American National Standards Institute (ANSI) for these three types of PPE:

• Eye and face protection,
• Head protection and
• Foot protection.

ANSI doesn’t have a standard for gloves, but OSHA recommended the selection be based upon the tasks being performed.

PPE training

As part of OSHA’s standards, employers are required to train employees who need to wear electrical PPE. Their training scope is about what to wear, when, how, proper maintenance, and how to dispose of it. The training also covers the PPE’s limitations.

Understanding the limitations of PPE is an important aspect of the training so one should take it seriously. Ultimately, wearing the proper protective clothing is viewed as the first line of defense in case of arc flash. But remember, PPE is not foolproof. Nevertheless, when combined with good safety practices, PPE provides the best possible outcome in the event of an arc flash or arc blast.

Including PPE training as part of your regular safety training can also help keep all employees up to date on any changes and give you a chance to review the effectiveness of your electrical PPE measures. That safety training should make sure everyone is taking the appropriate steps to prevent arc flash incidents and minimize their occurrences. Wearing and using proper PPE needs to be one of those steps. It will reduce your injuries and could save your life.

Solar energy is the future of electricity for homes, businesses, and utilities to feed into the grid. A lot of people are taking notice of how solar energy is becoming one of the fastest-growing developments of renewable energy worldwide. It’s convenient and works by taking the sun’s energy and transforming it into direct current (DC) electricity. Because solar technology has been refined. Moreover, it’s no secret that the cost of going solar is sinking swiftly to locals. Therefore, it makes an attractive, cost-saving option for many.

To broaden the use of their skills and develop their test and measurement toolset, the rising popularity of solar energy creates new opportunities for electricians, installers, and technicians. At Presidium.PH Corporation, we aim to help you find the right tool solutions to keep you safe in every operation. Whether you are installing PV modules on a residential scale, commissioning a new range, or doing routine maintenance.

Receive personalized recommendations from an Authorized Distributor. Contact us now!

+632 84590167 / +632 82570795

General Definition…

A clamp meter is an electrical test tool that integrates a basic digital multimeter with a current sensor.

Basically, clamps measure current. Meanwhile, probes measure voltage. Having a hinged jaw joined into an electrical meter allows technicians to clamp the jaws around a wire, cable, or other conductors at any point in an electrical system, then measure current in that circuit without disconnecting/de-energizing it.

Ultimately, underneath their plastic moldings, hard jaws consist of ferrite iron and are engineered to detect, deliberate, and measure the magnetic field being produced by current as it flows through a conductor.

1. Current-sensing jaw.
2. Tactile barrier (to protect fingers from shocks).
3. Hold button: Freezes the display reading.
4. Dial (aka rotary switch).
5. Display.
6. Backlight button.
7. Min Max button – Can be triggered depending on the amount of pushes.
8. Inrush current button.
9. Zero buttons (yellow): Removes dc offset from dc current measurements. Also serves as the dial’s shift button to select yellow functions scattered around the dial.
10. Jaw release lever.
11. Alignment marks – To meet accuracy specifications.
12. Common input jack.
13. Volts/ohm input jack.
14. Input for the flexible current probe.

Formerly created as a single-purpose test tool, recent clamp meters provide more measurement functions, greater accuracy, and in some cases specialized measurement features. In line with this, today’s clamp meters include most of the straightforward functions of a digital multimeter (DMM), such as the capability to measure voltage, continuity, and resistance.

Clamp meters have developed popular tools primarily for two reasons:

• Safety. Clamp meters allow electricians to avoid the old-school process of cutting into a wire and inserting a meter’s test leads into the circuit to take an in-line current measurement. As a result, the jaws of a clamp meter do not need to touch a conductor throughout a measurement.
• Convenience. During a measurement, it is not compulsory to shut off the circuit carrying current—a big boost in efficiency.

When measuring high levels of current, an ideal tool is a Clamp Meter. Meanwhile, DMMs cannot measure 10 A of current for more than 30 seconds without risking damage to the meter.

Also, clamp meters propose a minimum current range of 0 A to 100 A. Many models have an array of up to 600 A. Others go up to 999 A or 1400 A, and some plug-in clamp accessories such as the iFlex® can measure as high as 2500 A.

However, industrial equipment, industrial controls, residential/commercial/industrial electrical systems, and commercial/industrial HVAC, are used under Clamp meters.

• Service: To repair existing systems on an as-needed basis.
• Installation: To troubleshoot installation problems, perform final circuit tests, and supervise apprentice electricians while installing electrical equipment.
• Maintenance: To perform scheduled and preventative maintenance as well as system troubleshooting.

Three types of clamp meters exist:

• Current transformer clamp meters: measure only alternating current (ac).
• Hall Effect clamp meters: measure both alternating current and direct current (ac and dc).
• Flexible clamp meters: employ a Rogowski coil; measure ac only; good for measuring in tight spaces.

VISIT OUR WEBSITE AND SHOP NOW: Clamp Meters Archives – Presidium PH

By determining hot-neutral voltage, neutral-ground voltage, and hot-ground voltage you are well on your way to answering these receptacle fault questions:

• Is the outlet wired incorrectly?
• Is the branch circuit too heavily loaded?
• Do sensitive electronic loads have the voltage they need?

Basically, these three measurements, all occupied speedily at one outlet, deliver you with a solid acceptance of the building’s electrical supply.

Testing a three-slot receptacle for grounding polarity

Basically, inaccurately wired receptacles are not unusual. A three-slot receptacle has a hot slot (short), a neutral slot (long), and a grounding slot (U-shaped). Are the hot (black) and neutral (white) wires reversed? Are the neutral and ground (green) wires reversed or shorted?

Ultimately, these conditions can go unnoticed for a long time. Many loads aren’t delicate to polarity—they don’t care if hot and neutral are reversed. In contrast, sensitive electronic loads such as computer equipment and instrumentation do care about clean ground – a ground with no voltage and no-load currents on it. A single reversed neutral and ground can cooperate with the entire ground system.

Here’s what you can find.

Hot-neutral is the load voltage. Voltage should read about 120 V (typically 115 V to 125 V). You measure exactly 118.5 V.

• Neutral ground is a voltage drop (also called IR drop) caused by load current flowing through the impedance of the white wire. Let’s say you measure 1.5 V.
• The hot ground can be thought of as the source of voltage available at the receptacle. You read 120.0 V. Therefore, you note that hot-ground is higher than hot-neutral. In fact, the hot-ground is equal to the sum of the hot-neutral and neutral-ground voltages.

Are these readings normal? Is the outlet wired correctly?

How to detect mis-wired receptacles

The most common mis-wiring occurs if hot and neutral are switched, or if neutral and ground are either switched or shorted. How do you spot these conditions?

1. Measuring hot-neutral by itself does not tell you if they’ve been switched. You need to measure neutral-ground or hot-ground. If neutral-ground voltage is about 120 V and hot-ground is a few volts or less, then hot and neutral have been reversed.
2. Below load conditions, there should be some neutral-ground voltage – 2 V or a little bit less is pretty typical. If neutral-ground voltage is 0 V – again assuming that there is a load on the circuit – then check for a neutral-ground connection in the receptacle, whether accidental or intentional.
3. In checking if neutral and ground are switched, measure hot-neutral and hot-ground under load. In line with this, Hot-ground should be greater than hot-neutral. The greater the load, the more the difference. If hot-neutral voltage, measured with the load on the circuit, is greater than hot-ground, then the neutral and ground are switched. This is a probable safety hazard and the condition should be modified immediately.

Remember…

Hot-ground reading should be the highest of the three readings. Therefore, the ground circuit, under normal, non-fault conditions, should have no current and therefore no IR drop on it. You can think of the ground connection as a wire running back to the source (the main panel or the transformer), where it’s connected to the neutral. On the receptacle end of the ground path, where the measurement is being made, the ground is not connected to any voltage source (again, assuming there is not a fault). So the ground wire is like a long test lead back to the source voltage.

When there is a load connected, the hot-ground receptacle source voltage should be the sum of the hot-neutral voltage (the voltage across the load) and the neutral-ground voltage (the voltage drop on the neutral all the way back to its connection to the ground circuit).

Finally, if you want to know more about Fluke tools, don’t hesitate to browse in one of Philippines’ authorized distributors, Presidium.PH!