OH&S

There are far to many if then else statements for OSHA compliance.

BASIC Guidelines:
Protect workers from high voltage (threshold is around 40 volts)

Fire hazzards fall under general house-keeping.
However, if the parts they are working on are apt to explode or burst into flames, then some form of sheilding would be required.

Radiation: You need to verify the exposure limits for the specific type of radiation involved.

Your best resource is going to be the local / state OSHA office.

Generally, common sense applies.
If the task presents a risk of injury to the workers, steps must be taken to eliminate / reduce the risk.

In electronics assembly, the biggest issues are X-Acto knives, lead, other chemicals, and repetativestress trauma.

Most OSHA inspecters are more versed in "general" hazzards;
lifting, triping, crushing, chemical issues.

Chas