Curious Power Issue while using Chain Saw with Extension Cable!

sujsuj

grumbler said:

Jonboy_1984 said:

They create additional resistance (and heat) when coiled due to the magnetic fields.

I think, magnetic field is a myth as cable has two cores with opposite currents.

And, again, heat (poor dissipation in this case) on its own cannot cause MCB tripping

RCD tripped

sujsuj

subjecttocontract said:

Could it be a faulty extension lead ? If plugging the chainsaw directly into the wall socket works ok and plugging it into the ext lead doesn't work ok.....the fault is with the ext lead surely ?

Extension cables are good, used for other small tools like grinders always without any trouble

sujsuj

Keep_pedalling said:

grumbler said:

Section62 said:

sujsuj said:

I was trying to cut some wood using my RYOBI 2300W 40cm Chainsaw (RCS2340B). I used extension cables 13A rated its 25 meter long. But when I connect Chainsaw at end of extension cable power trips and Chainsaw stopped working. I could connect Chainsaw directly to plug and it works.

If it is the MCB tripping then there's a good chance the issue is the volt drop over 50m of low-cost extension cable is resulting in a current draw high enough to cause the MCB to trip.  What rating is the MCB, if it is that which is tripping?  (a photo may be best)

This makes no sense. Higher cable resistance (and, as a result, higher voltage drop over the cable) can result only in lower current, that cannot cause MCB tripping.

The saw is likely to compensate the lower voltage by drawing a higher current to compensate. 

I would not use a cheap extension lead for such a high current device. I purchased a heavy duty lead for my EV granny charger for holiday use from these guys. 

https://toughleads.co.uk/collections/ev-electric-vehicle-extension-leads

Is there any specific rating I should look...? I can see RIOBI wire is double thicker compared to extension lead cable, Thanks

sujsuj

tripped switch highlighted

danrv

sujsuj said:

Jonboy_1984 said:

Also what else is on the same circuit as socket, e.g. is it a kitchen socket with a washing machine, fridge, freezer etc on the same switch and what is the rating on the switch in the consumer unit?

There is a chance it’s the total load that’s exceeding the switch rating (I assume you are just running the saw rather than cutting anything when testing without the extension cables?).

When  I tried with both ALDI Workzone 25 M 13 A as well as Masterplug 20M 13A  it caused problems.

Try them one at a time rather than together.

sujsuj

danrv said:

sujsuj said:

Jonboy_1984 said:

Also what else is on the same circuit as socket, e.g. is it a kitchen socket with a washing machine, fridge, freezer etc on the same switch and what is the rating on the switch in the consumer unit?

There is a chance it’s the total load that’s exceeding the switch rating (I assume you are just running the saw rather than cutting anything when testing without the extension cables?).

When  I tried with both ALDI Workzone 25 M 13 A as well as Masterplug 20M 13A  it caused problems.

Try them one at a time rather than together.

Used  only one extension cable at a time, when it failed used the other one

Section62

sujsuj said:

grumbler said:

Jonboy_1984 said:

They create additional resistance (and heat) when coiled due to the magnetic fields.

I think, magnetic field is a myth as cable has two cores with opposite currents.

And, again, heat (poor dissipation in this case) on its own cannot cause MCB tripping

RCD tripped

sujsuj said:

tripped switch highlighted

That isn't an RCD you've highlighted.  It is an MCB.

Move your wood pile closer to the power source... will be easier, safer and cheaper.

grumbler

This MCB (yes, MCB, not RCD) is just 16A.

Your 2.3kW saw draws normally about 10A, more when it starts or is overloaded. Hardly a surprise that it trips the MCB occasionally and unpredictably.

Extension leads (unless they are faulty) have nothing to do with this.

Or it can be some fault with the saw.

Section62

grumbler said:

This MCB (yes, MCB, not RCD) is just 16A.

Your 2.3kW saw draws normally about 10A, more when it starts or is overloaded. Hardly a surprise that it trips the MCB occasionally and unpredictably.

Extension leads (unless they are faulty) have nothing to do with this.

Setting the discussion about the theory aside then, can you explain why the same MCB doesn't trip when the same chainsaw is plugged into the wall socket with the extension lead(s) removed from the equation?

grumbler

Section62 said:

grumbler said:

This MCB (yes, MCB, not RCD) is just 16A.

Your 2.3kW saw draws normally about 10A, more when it starts or is overloaded. Hardly a surprise that it trips the MCB occasionally and unpredictably.

Extension leads (unless they are faulty) have nothing to do with this.

Setting the discussion about the theory aside then, can you explain why the same MCB doesn't trip when the same chainsaw is plugged into the wall socket with the extension lead(s) removed from the equation?

As I said, "occasionally and unpredictably". Most likely, without the extensions lead the tests were short and without serious load.