voltage reading on the nuetral

[Rockomuir]

Hello all,

Been to my local campsite to fit a hairdryer in the toilet blocks. Before starting works i ran through a few basic checks as the installation is prettry old. I checked the voltage at the main switch at the board. I got a reading of 216v phase and 10v on the neutral. Has anyone got any suggesstions as to why i would have 10v on the neutral. The supply for the toilet block is a long run from the cutout so i am expecting so volt drop.

 

[Farmelectrics]

Induced voltage possibly

 

[Moses]

Hello all,

Been to my local campsite to fit a hairdryer in the toilet blocks. Before starting works i ran through a few basic checks as the installation is prettry old. I checked the voltage at the main switch at the board. I got a reading of 216v phase and 10v on the neutral. Has anyone got any suggesstions as to why i would have 10v on the neutral. The supply for the toilet block is a long run from the cutout so i am expecting so volt drop.

Load current in the N-wire produces voltdrop.
But 10V is on the high side.

 

[Rockomuir]

Would this stop me from performing an rcd test and struggle to get a zs reading. What realistically could i do to improve this ?

 

[Jimmy Boy]

Hello all,

Been to my local campsite to fit a hairdryer in the toilet blocks. Before starting works i ran through a few basic checks as the installation is prettry old. I checked the voltage at the main switch at the board. I got a reading of 216v phase and 10v on the neutral. Has anyone got any suggesstions as to why i would have 10v on the neutral. The supply for the toilet block is a long run from the cutout so i am expecting so volt drop.

A Hair Dryer not Hand Dryer ? It's been yonks since I camped they have Hair Dryers now things have moved on

 

[Rockomuir]

50p for three minutes

 

[Jimmy Boy]

50p for three minutes

Bloody Hell lol ! I assume you will carry this out using the format of a minor electrical work certificates so as long as you comply with those requirements I doubt you have owt to worry about, your not doing a PIR !

 

[Moses]

Would this stop me from performing an rcd test and struggle to get a zs reading. What realistically could i do to improve this ?

NO. and

No. and

depends how much you want to spend?

to improve your Zs, ask the DNO to upgrade the supply and convert it to TN-C-S
Install bigger cables for your final circuit.
Install bigger cable for your earth cable.

 

[Knobhead]

As Moses has said, volt drop in the neutral can cause a voltage rise to earth.

I’ve tried to make this drawing as clear as I can.

View attachment 12794

 

[Moses]

As Moses has said, volt drop in the neutral can cause a voltage rise to earth.

I’ve tried to make this drawing as clear as I can.

View attachment 12794

Tony is that the same DWG as the other day?????

You couldn't have done an other one?????

 

[Knobhead]

OK I hold my hand up. I never delete a drawing once done. You never know when you'll need it again.

 

[Jimmy Boy]

OK please explain the physics behind the drawing I don't get it

 

[telectrix]

as i see it, and i may be wrong, in a circuit under load, there is a certain volt drop. this VD is on the L and N, but the E is still at 0v. so there will be a small voltage differential between the N and E, relative to the VD of the circuit,

 

[Jimmy Boy]

OK I hold my hand up. I never delete a drawing once done. You never know when you'll need it again.

Didn't know Abu Hamza was a spark.Sorry couldn't pass on that one..

 

[telectrix]

he may not be but i vote him as a prime candidate for 2000v.

 

[Jimmy Boy]

How many Kv do you get through a HT on a Quad bike coil ? I split a HT circuit other day while it was running I was dancing around like a crack head with St Vitus dance much to the amusement of my 19 year old kid..FK me it hurt

 

[Silly Sausage]

Didn't know Abu Hamza was a spark.

He's not...

 

[Silly Sausage]

OK please explain the physics behind the drawing I don't get it

It's just 3 resistances in series, each one drops voltage across it.

Uo = Supply voltage
R1 = Resistance of Line conductor
Rn = Resistance of Neutral conductor
RL = Resistance of Load

Voltage across Line V1 = Uo * (R1/(R1+RL+R2))

Voltage across Load VL = Uo * (RL/(R1+RL+R2))

Voltage across Neutral Vn = Uo * (Rn/(R1+RL+R2))

V1 + VL + Vn = Uo

 

[telectrix]

How many Kv do you get through a HT on a Quad bike coil ? I split a HT circuit other day while it was running I was dancing around like a crack head with St Vitus dance much to the amusement of my 19 year old kid..FK me it hurt

HT from coils is in the region of 15kV.

 

[Had8Lives]

Check the connections at the main cutout end and look for joins and check the cable size. Your hair dryer may not operate properly on 214V.