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Oh no ... Not Another Shed Thread!

Discuss Oh no ... Not Another Shed Thread! in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Archy Styrigg said:
Here's a question on the same theme...
A backyard has a metallic stand pipe (coming out of the ground) and a socket outlet (RCDed back in the house) within arms reach.
Basically a shed without walls or a roof.
Does the standpipe require bonding to the MET?
Click to expand...

I would say no it doesn't.
Think of all those whirly gigs and washing lines that would need earthing
 
adjective1.introduced or coming from without; not belonging or proper to a thing;external; foreign:

as the standpipe is outside, it's not coming inside. ergo... it's not, by definition, extraneous.
 
Archy Styrigg said:
Here's a question on the same theme...
A backyard has a metallic stand pipe (coming out of the ground) and a socket outlet (RCDed back in the house) within arms reach.
Basically a shed without walls or a roof.
Does the standpipe require bonding to the MET?
Click to expand...

Would I be correct in thinking that the requirement, or otherwise, would be defined by a measurement of the impedance between the standpipe and the earth of the electrical installation at the socket outlet? If so, would local equipotential bonding be sufficient?

If so, the previous Poster's point about washing line poles is an interesting one. What happens if you are mowing the lawn and you cut the 2-core cable to the lawn mower? The mower shorts Line and Neutral, becoming live. If the current finds an earth path then the RCD operates. If the operator is the earth path then the aim is to reduce the earth path resistance to reduce the 'touch' voltage, potential difference, between the source of the voltage and earth; faulty lawn mower and earth. What happens if the person is in contact between the mower and a 'spiked' washing line or washing line pole?
 
GB.Kayak said:
Would I be correct in thinking that the requirement, or otherwise, would be defined by a measurement of the impedance between the standpipe and the earth of the electrical installation at the socket outlet? If so, would local equipotential bonding be sufficient?

If so, the previous Poster's point about washing line poles is an interesting one. What happens if you are mowing the lawn and you cut the 2-core cable to the lawn mower? The mower shorts Line and Neutral, becoming live. If the current finds an earth path then the RCD operates. If the operator is the earth path then the aim is to reduce the earth path resistance to reduce the 'touch' voltage, potential difference, between the source of the voltage and earth; faulty lawn mower and earth. What happens if the person is in contact between the mower and a 'spiked' washing line or washing line pole?
Click to expand...

Surely if the mower has a 2 core then it's class 2?

The fuse would or should operate under short circuit?

I could be reading this totally wrong however!:smile:
 
hmm. i've just cut the mower cable. let me pick it up and hold onto the pole. flying pigs and darwinism comes into mind.
 
Simonslimline said:
Surely if the mower has a 2 core then it's class 2?

The fuse would or should operate under short circuit?

I could be reading this totally wrong however!:smile:
Click to expand...

Yes, electric mowers are doubly insulated ... note the cause of the fault is not internal, it is external ... though I suppose being doubly insulated, their body is probably plastic these days. Perhaps Tel's flying pigs are more realistic! ;-))
 

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