IEC 60364 Table 48A

ProMbrooke:

A handle on a fridge, tool, pole ect becomes a large contact surface area. Both feet on the ground with wet shoes. In fact with a power tool its possible to have both hands on it at the time of a fault.

Is this based on the guidance regarding contact area and footwear in the relevant parts of IEC 60479?


Shoes are generally not considered in the standard, wet or otherwise, and the advice in IEC/TR 60479-5 is to take them into account where appropriate

IEC 60479 gives 850 ohms at 125 volts with salt water.

Worth having a look at IEC/TR  60479-5. 

Water wet would be places where wet hands are common or likely to be found: pools, spas, bathrooms, greenhouses, sinks, outdoors. 

"outdoors" ... depends where you are. Saltwater in some conditions.

Children are a difficult challenge as ethical issues are raised as to whether or not they can consent in scientific experiments. However, considering smaller hands and thus contact area the difference may not be so big. At least resistance wise. Whether or not children have a lower ventricular fibrillation threshold would be impossible to test for, for obvious reasons. 

It's known that children, and P10, are at more risk than the figures in IEC 60479 are provided. Whilst this is known, and IEC 60479 is generally considered to err on the side of caution, it's really impossible to make other assumptions.

 

 

 

ProMbrooke:

A handle on a fridge, tool, pole ect becomes a large contact surface area. Both feet on the ground with wet shoes. In fact with a power tool its possible to have both hands on it at the time of a fault.

Is this based on the guidance regarding contact area and footwear in the relevant parts of IEC 60479?


Shoes are generally not considered in the standard, wet or otherwise, and the advice in IEC/TR 60479-5 is to take them into account where appropriate

IEC 60479 gives 850 ohms at 125 volts with salt water.

Worth having a look at IEC/TR  60479-5. 

Water wet would be places where wet hands are common or likely to be found: pools, spas, bathrooms, greenhouses, sinks, outdoors. 

"outdoors" ... depends where you are. Saltwater in some conditions.

Children are a difficult challenge as ethical issues are raised as to whether or not they can consent in scientific experiments. However, considering smaller hands and thus contact area the difference may not be so big. At least resistance wise. Whether or not children have a lower ventricular fibrillation threshold would be impossible to test for, for obvious reasons. 

It's known that children, and P10, are at more risk than the figures in IEC 60479 are provided. Whilst this is known, and IEC 60479 is generally considered to err on the side of caution, it's really impossible to make other assumptions.