Measuring 3 phase usage with a clamp meter?

[jouleflow]

Good morning,


I have a 3 phase supply into my workshop Hager dist board. I need to measure my usage for business accounts.
My Electrician mentioned clamping around the swa cable with a ct clamp would be a simple metering option, but I'm not sure if I understood him correctly.
Is this possible, or do I need him to fit a hard wired meter.
If anyone has a solution for the uk please reply.

Thanks

Greg.

 

[Electro-tech]

Depending on what Hager DB you have, Hager does a meter that fits alongside the Main Incomer. Probably expensive. I can't see a clamp or C T's working around a shielded SWA cable. You can put a CT around each phase coupled to a remote meter.

 

[davesparks]

What size supply is coming in to the DB? This may determine whether installing a whole current meter or a CT meter would be cheaper

 

[jouleflow]

What size supply is coming in to the DB? This may determine whether installing a whole current meter or a CT meter would be cheaper

About 80A max

 

[Rockingit]

About 80A max

You can a 3ph meter for under £150 that will do this either with/out CT coil options

 

[Vortigern]

Whats wrong with your bill to monitor energy prices? Maybe your supplier can fit a monitor for you?

 

[Petej999]

Good morning,


I have a 3 phase supply into my workshop Hager dist board. I need to measure my usage for business accounts.
My Electrician mentioned clamping around the swa cable with a ct clamp would be a simple metering option, but I'm not sure if I understood him correctly.
Is this possible, or do I need him to fit a hard wired meter.
If anyone has a solution for the uk please reply.

Thanks

Greg.

Wont work due to the steel armouring on the SWA watt meter use CTs around the single cores in the DB in conjunction with a suitable wattmeter

 

[brianmoooore]

Wont work due to the steel armouring on the SWA

Wouldn't work with a CT around the whole cable even if the armour wasn't there

 

[davesparks]

Wont work due to the steel armouring on the SWA watt meter use CTs around the single cores in the DB in conjunction with a suitable wattmeter

A wattmeter will not help here, it needs a watthour meter.

 

[Electro-tech]

Or even maybe a Kilo-watt hour meter.

 

[jouleflow]

Thankyou for all your replies.

Hager do one that will fit in their distribution board but it is over £430.00+vat.
I found this at CEF - 3 Phase Multifunction Energy Meter MID Certified with Pulse and Modbus - https://www.cef.co.uk/catalogue/products/5031071-three-phase-multifunction-energy-meter-mid-certified-with-pulse-and-modbus for £135.00+vat.
I'll check the depth available in the board to see if it will fit.

 

[davesparks]

Thankyou for all your replies.

Hager do one that will fit in their distribution board but it is over £430.00+vat.
I found this at CEF - 3 Phase Multifunction Energy Meter MID Certified with Pulse and Modbus - https://www.cef.co.uk/catalogue/products/5031071-three-phase-multifunction-energy-meter-mid-certified-with-pulse-and-modbus for £135.00+vat.
I'll check the depth available in the board to see if it will fit.

That is just the meter and won't include the current transformers, fuses/circuit breaker to supply it or any interconnecting cables etc which would all be included in the Hager meter pack.


Plus you shouldn't be fitting anything which hasn't been approved by the manufacturer of the DB in the DB.

 

[jouleflow]

Thanks I'll pass that on to the sparky. It is a neat solution so I will probably go for the Hager.

 

[pc1966]

The Rayleigh meters are good, but as mentioned above you need the matching CT and some supply fuses as well as some enclosure somewhere they can be fitted. They still work out good value though.

The Hager meter is the supplier approved option, so the obvious choice. But they, for some dumb-Muppet reasons, supplied the one I got with glass 20x5mm LRC fuses, not even the ceramic HRC (that are 1.5kA breaking, so a touch under my PSCC). I put in some 38x10mm fuses that were 120kA or similar break capacity as using the same elsewhere, but at the very least I would say check and fit HRC fuses instead.