B
The book, "Pactical Electrical Equipment and Installations in Hazardous Areas", 2005, has a chapter "Fault Finding and Testing", with a diagram showing a multimeter with its probes on either 'end' of an Intrinsically Safe barrier/isolator, one probe on the safe end, the other probe on the hazardous end. The diagram can be seen here:
http://i40.tinypic.com/334kuvs.jpg
A large X is drawn through the illustration with the text saying, "Figure 15.7 shows a meter bridging the interface. This should not be done under any circumstance with the hazardous area wiring connected." But there's no explanation for why the warning.
What are the implications of doing putting a meter across the barrier, particularly with an I/S rated multimeter?
http://i40.tinypic.com/334kuvs.jpg
A large X is drawn through the illustration with the text saying, "Figure 15.7 shows a meter bridging the interface. This should not be done under any circumstance with the hazardous area wiring connected." But there's no explanation for why the warning.
What are the implications of doing putting a meter across the barrier, particularly with an I/S rated multimeter?