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     be completed before detailed design begins; delete guidance text in
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# Controls Design Basis

| Project |  | Document no. |  |
|---|---|---|---|
| Customer |  | Revision |  |
| Prepared by |  | Date |  |
| Approved by |  | Status | Draft |

## 1. Scope (required)

[What equipment/process this design basis covers, and — just as important —
what it excludes. Name the battery limits: where your scope starts and ends
electrically, mechanically, and in software.]

## 2. Referenced Documents

| Document | Number / revision |
|---|---|
| Process description / P&IDs |  |
| Customer specification |  |
| Standards applicability register |  |
| Site electrical standard |  |

## 3. Codes and Standards (required)

[List governing standards WITH editions. Reference the standards
applicability register rather than duplicating it.]

## 4. Electrical Supply and Distribution (required)

- Supply voltage / phases / frequency:
- Available fault current at supply point (documented source):
- Panel SCCR target:
- Earthing/grounding system (TN-S / TN-C-S / TT / IT / NEC solidly grounded):
- Control voltage(s) and source (CPT / PSU):

## 5. Control System Architecture (required)

- Platform (PLC/PAC/DCS) and rationale:
- I/O philosophy (local / remote / distributed; spare capacity %):
- Network architecture and protocols:
- HMI/SCADA platform:
- Time synchronization:

## 6. Safety Functions (required if any)

- Risk assessment method and document reference:
- Safety function list with PLr / SIL targets:
- Safety platform (relay / configurable / safety PLC):
- Reference to Safety Requirements Specification:

## 7. Environment and Installation

- Ambient temperature range / altitude / humidity:
- Enclosure ratings (NEMA / IP) by location:
- Hazardous-area classification (if any) and drawing reference:
- Washdown / corrosive / hygienic requirements:

## 8. Naming, Tagging, and Documentation Conventions

- Tag format (e.g. ISA-5.1 style):
- Wire numbering scheme:
- Drawing numbering scheme:
- Software naming conventions:

## 9. Spares, Expansion, and Lifecycle

- Spare I/O and panel space targets:
- Expected system life and MOC expectations:
- Spare parts philosophy:

## 10. Open Items

| # | Item | Owner | Needed by |
|---|---|---|---|
| 1 |  |  |  |