Final answer:
Without proper context or safety guidelines, the correct number of seconds for a pre shift spark test cannot be provided. However, examples of adding time in minutes and seconds were given, such as combining 15 and 60 minutes to make 75 minutes, and so on.
Step-by-step explanation:
The question regarding pre shift spark test durations for members with ECD (Explosive Charge Detonator, assumed in this context) relates to a safety procedure in an industrial or construction environment. Unfortunately, without specific guidance from the entity or regulation requiring the spark test, it is impossible to provide an accurate number of seconds for the test. Health and safety protocols can vary widely between organizations and jurisdictions. However, we can talk about how to add units of time as shown in the examples provided.
- 15 minutes + 60 minutes = 75 minutes
- 10 minutes + 20 minutes = 30 minutes
- 15 seconds + 45 seconds = 60 seconds, which is equivalent to 1 minute
It is essential always to follow the specific safety procedures that have been outlined by your company or regulatory body.