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I am installing a new service in an outbuilding, It is not at my residence so I can't test it readily. On the neutral/grounding bars in the panel, it appears as if the neutral and ground are all connected. In fact, on both bars, there are 2 screws for ground/neutral. To clear this up, on older panels the screws are right underneath each other. On this panel, there are 2 screws, space, 2 screws. this is what makes me think the ground and neutral can be on the same bar. The panel box is from Lowe' and I think it might be called Homelite.

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    It's Homeline, it's a cheapie. Homeline is notorious for not providing separate neutral and ground buses as needed in a subpanel. This can be solved by both not buying Homeline and not buying electrical from big-box. Take it back, and with luck, ThreePhaseEel will stop by and give you a good reco. Not that SE is a shopping site... – Harper May 14 '18 at 21:02
  • You say new service, to an electrician that mean meter and “Main panel”. Or is this a “Sub-panel”? A sub-panel is fed from a Main panel or another sub-panel. Which it is important, because the rule is different for each—As @EdBeal notes in his answer. – Tyson May 14 '18 at 22:10
  • Is this a service to the building with its own meter, or a feeder from another building's service? – ThreePhaseEel May 14 '18 at 22:17
  • What is your question? – SDsolar May 15 '18 at 1:31
  • This is a new meter, new panel box, new wiring. – Jim Edwards May 15 '18 at 22:53
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Since this has its own meter, it's its own service entrance, but put a ground bar in anyway

Since you're getting a separately metered drop from the utility (instead of running a feeder from another building on the property), it's a service entrance all its own, so a service bond between neutral and ground needs to be established here. (In other words, the green screw or strap that makes the neutral-to-ground connection stays put.)

I would still get a ground bar (Square-D PK15GTAL) and install it in the panel, then land the grounds separately from the neutrals, though, as this makes converting the panel to run off a feeder at a later date rather easier. (Having two services on the property can get...awkward if you want control of say outdoor lights from both buildings.)

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If this is your main service panel both neutral and ground are connected and the ground and neutral buds are interchangeable or usable for both equipment grounds (bare or green wire) and the white or neutral are the same at only this point. If this is a sub panel fed from a main someplace else on the service the ground and neutral busses must be isolated per code.

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