Question

1. why should gas piping not be used as a ground?

it could be hazardous if gas was present and there was a spark
black iron gas piping is a poor conductor
jumper wires are not allowed to be installed on gas meters
pipe dope at gas connections could interrupt the ground
much of underground gas piping is plastic

Explanation:

To determine why gas piping should not be used as a ground, we analyze each option:

• Option "It could be hazardous if gas was present and there was a spark": Using gas piping as a ground could lead to electrical currents, potentially causing sparks. If gas is present (as gas piping carries gas), a spark could ignite the gas, creating a hazardous situation (e.g., explosion, fire).
• "Black iron gas piping is a poor conductor": Black iron is actually a reasonably good conductor, so this is incorrect.
• "Jumper wires are not allowed to be installed on gas meters": This is about jumper wires on meters, not why gas piping can't be a ground, so irrelevant.
• "Pipe dope at gas connections could interrupt the ground": While pipe dope might affect conductivity, the primary hazard is the gas - spark risk, not just conductivity interruption.
• "Much of underground gas piping is plastic": Underground piping being plastic doesn't explain why gas piping (including non - plastic parts) can't be used as a ground, and the main hazard is related to gas and sparks, not the material of underground piping.

Answer:

A. It could be hazardous if gas was present and there was a spark