Discuss Earth Leakage clamp meters in the Electrical Tools and Products area at ElectriciansForums.net

Jimmy Boy

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Arms
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I want to invest in one of these, it's primary function will be for me to measure the mA on circuits where IT is in use, it seems they can be useful to determine where a fault might be on a circuit, I would be greatful for you opinions on these options.What i can't quite fathom and hoping someone can shed light on is the ranges, I want to read right down from say 1 mA - 30 mA, there is also a huge price difference on these products.

ATB J

TM-EL9809 High Resolution AC Earth Leakage Clamp Meter

Metrel MD 9270 Earth leakage clamp with Power functions
 

topquark

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Mentor
Arms
Short answer: Both would be fine Jimmy.

Note that neither do DC though (which may not matter unless you're into Solar/car electrics). Also the max voltage on the TM is 400V (may be an issue).

The reason for the price difference (£100) is the Metrel is a TRMS meter (it will compensate for some of the contamination effects from harmonics and the like) and will give you a "more accurate reading" (without the distortion effects). The metrel will also allow you to view the harmonics and power factor for a supply.

The TM-EL9809 would be perfectly adequate for earth leakage in IT environments (appropriate resolution of 10microAmps and a 40milliAmp range) and has the hold, min, max functions (very useful when trying to find intermittent/quickly occuring faults).
 

Jimmy Boy

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Arms
  • Thread Starter Thread Starter
  • #9
Perhaps I might go for the Metral then is it the 9270 you have Topquark ?
J
 

topquark

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Mentor
Arms
Perhaps I might go for the Metral then is it the 9270 you have Topquark ?
J
I have two clamp meters. I have the Metrel MD9270 and an AlphaTek TEK 633 (no longer available).

The Metrel has nice big jaws (slightly bigger internal space than a 50p piece). The AlphaTek only just fits on the tip of my thumb (so would be inadequate for anything over 35mm).

The only reason I bought the Metrel was because the AlphaTek had gone awol. I had lent it to a friend's son for an electrical problem on his car (it works with DC) and was convinced I had put it back in the van afterwards (but hadn't :banghead:) and they bought it around a couple of months after I'd purchased the Metrel.

Both quite capable of doing most jobs.
 
M

MarkieSparkie

I've got the Metrel MD9270 it's the dogs nuts mate. I tested just about every earth leakage meter on the market before making my decision and it was the stand out meter regardless of price.
 

Jimmy Boy

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Arms
  • Thread Starter Thread Starter
  • #12
I've got the Metrel MD9270 it's the dogs nuts mate. I tested just about every earth leakage meter on the market before making my decision and it was the stand out meter regardless of price.
Thats very reassuring to hear, could you give me some examples of what types of circuits and /or faults these meters come in to their own ? TBH never seen the need for one up till now as most of my work is maintenance and smaller installs, now I am doing some IT circuits with high integrity earthing I feel the need for one.

Thanks J
 

HandySparks

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Mentor
Arms
Esteemed
It's a useful tool where you can't, or don't want to, isolate the installation. Maybe just for a first look. For instance, a significant current down the main earthing conductor can indicate poor insulation resistance or a neutral-earth fault without having to disconnecting anything. You can learn a bit more by turning loads and circuits on and off and seeing how the current changes.
 
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