I do commercial work for a client that is a commercial retail space developer. We do all of their low voltage stuff.
Food or drinks only in designated places. No food or drinks anywhere else. They don't want someone spilling a drink on electric, or making a slip hazard.
No using a cell phone unless in a designated space. Too many people keep falling off buildings because they are checking twitter, facebook, instagram and texting their boo. If you need documentation it needs to be printed, or go to a designated space. We keep all of our notes and documenation on evernote, so we just print everything up beforehand, and every tech on the project gets a copy.
Hardhats, eye protection, and steel toes are a must.
Any ladder over 6' requires a harness. We have one harness that we swap between people. Most work we do can be done with a 6' ladder.
They should give you an OSHA guideline sheet to sign off on. Make sure you read this, because there could be specifics about that project that were not on the last project.
You will have to show proof of Liability insurance with a 5mill umbrella policy. Most of our builders and most buildings we work on require this.
You will also have to submit your Workers Comp insurance to the builder too. This will have to be done every time you WC expires. They need a copy of all subs certificates.
If you have any subs, they will need to submit their WC and Insurance Certificate.
