Direct answer
A US utility-scale BOS package combines the project wiring and protection bill of materials into one coordinated supply: PV wire and MC4 connectors, combiner boxes and DC/AC protection, EMT conduit with rain-tight (wet-location) couplings and connectors with grounding lugs, two-hole straps, and field junction/pull boxes. For the US, specify UL listings (UL 797 EMT, UL 514B fittings, UL 1741 combiners, UL 248-19 PV fuses), the NEC edition the AHJ enforces, conduit trade sizes and fill, connector count, and the delivery term (FOB, CIF or DDP).
OmniSol acts as a single supplier of record across the BOS bill of materials so EPCs place one PO instead of chasing many vendors. We confirm UL listings and NEC compliance per line, mark each item with its trade size and rating, and consolidate the order into documented containers. For heavy steel raceway we confirm landed cost — including Section 232 steel tariffs and any AD/CVD — up front so there are no surprises at the port.
Core procurement parameters
| Conduit & raceway | UL 797 EMT (1", 1-1/2", 2"), rain-tight couplings/connectors, grounding lugs, two-hole straps |
|---|---|
| String wiring | PV wire (UL 4703) and MC4-compatible connectors, male/female, by the thousand |
| Protection & combiners | UL 1741 combiner boxes, UL 248-19 PV fuses, UL 1449 SPD, DC/AC protection |
| Enclosures | Field junction / pull boxes (e.g. 24"x24"x36"), NEMA 3R / 4X |
| Code basis | NEC 2023 Article 690 / 358 (EMT) / 314 (boxes); AHJ edition confirmed at RFQ |
| Delivery | FOB / CIF / DDP with landed-cost (incl. steel tariffs) confirmed up front |
Applications
- Utility-scale ground-mount PV
- Large C&I rooftop and carport
- Repowering and BOS resupply
- EPC single-PO BOS procurement
Available options
- Full-BOM single PO
- UL-listed line items only
- DDP duty-paid delivery
- Conduit trade-size kitting
- Per-zone labeling
- Consolidated mixed container
QC points before shipment
BOM procurement notes
Utility-Scale Solar BOS Full-Package Supplier for the USA should be treated as part of a procurement BOM, not as an isolated catalogue item. The usual starting points are conduit & raceway (UL 797 EMT (1", 1-1/2", 2"), rain-tight couplings/connectors, grounding lugs, two-hole straps), string wiring (PV wire (UL 4703) and MC4-compatible connectors, male/female, by the thousand), protection & combiners (UL 1741 combiner boxes, UL 248-19 PV fuses, UL 1449 SPD, DC/AC protection). Typical use cases include Utility-scale ground-mount PV, Large C&I rooftop and carport, Repowering and BOS resupply. Market sourcing pages should connect the destination requirement with the actual product BOM. The same product family can need different certificates, labels, plug types, packing rules, import documents and voltage assumptions depending on the country.
A practical RFQ should describe the required variant, quantity and packing in the same language the site team will use later. For this page, the common option set includes Full-BOM single PO, UL-listed line items only, DDP duty-paid delivery. The RFQ checklist should cover EMT trade sizes and total feet, Rain-tight fitting and coupling counts, Grounding lug requirement, MC4 male/female counts so the quote can be compared across suppliers without hidden assumptions.
For market pages, buyers should confirm the local standard, Incoterm, destination port, certificate language, customs documentation and any project-owner approval rule before locking the supplier list. Before shipment, the inspection record should include Verify UL listing/file number per line (EMT, fittings, fuses, combiner, SPD); Confirm trade sizes and ratings match the plan set; Check rain-tight fittings are wet-location rated and grounding lugs fitted. This gives EPC buyers and distributors a cleaner handover from sourcing to receiving, especially when the order is consolidated with other BOS lines from the central products hub.
FAQ
Can OmniSol supply the entire US BOS bill of materials in one order?
Yes. We consolidate PV wire, MC4 connectors, combiner boxes, DC/AC protection, EMT conduit and rain-tight fittings, grounding, straps and field junction boxes into one documented supply package, so an EPC issues a single PO instead of coordinating multiple vendors.
Is the EMT conduit and fittings UL listed for US installation?
Yes — we supply UL 797 listed EMT and UL 514B rain-tight (wet-location) couplings and connectors, with grounding lugs where specified, suitable for NEC Article 358 raceway methods. We provide the UL file references for your plan set.
How do you handle US steel tariffs and landed cost on conduit?
Steel conduit is subject to Section 232 steel tariffs and any applicable AD/CVD. We quote it transparently — FOB/CIF with duties applied by your broker, or DDP with all duties included — and confirm the full landed cost before you commit, so the conduit line is never a surprise.
Do the connectors, combiners and fuses meet US codes?
We supply MC4-compatible connectors, UL 1741 combiner boxes, UL 248-19 PV fuses and UL 1449 SPDs configured for NEC 2023 Article 690 (including AFCI 690.11 and rapid shutdown 690.12). Confirm the NEC edition your AHJ enforces and we configure accordingly.
How is a mixed BOS container packed and documented?
Items are kitted by trade size and project zone, labeled, photographed and listed on a master packing list with the UL/rating references per line. This keeps customs clearance and on-site staging clean for large projects.