Why separate test power from auxiliary supply?
The Simplex Electra manual dated 8 June 2021 describes fan and control power supplied from the test source or an external source in that product arrangement. This demonstrates why a drawing review must identify the actual selected equipment and supply arrangement. It is not a connection rule for all load banks.
Critical Power Drafting is independent and is not affiliated with Simplex. Obtain the current manual and approved project design for the selected model; the older manual linked here supports the distinction, not approval of a particular installation.
Which interfaces belong in the drawing worksheet?
Use the controlled one-line, equipment connection drawing, temporary-services scope and approved test-plan references. The table reviews information completeness. It does not give cable sizing, switching steps or permission to connect equipment.
| Interface | Controlled evidence | Unresolved question |
|---|---|---|
| Test-power boundary | Source, connection point and equipment identifiers | Which approved document defines this connection? |
| Fan and control supply | Selected equipment arrangement and supply reference | Is an external auxiliary supply required in this configuration? |
| Temporary cabling | Approved design and routing drawing reference | Who owns the design and site interface? |
| Protection and isolation | Approved engineering reference | Are the responsible reviewer and document identified? |
| Airflow and location | Equipment manual and approved layout | Does the layout owner have the equipment requirements? |
| Status and controls | Relevant approved interface drawing | Are identifiers consistent across documents? |
| Removal and reinstatement | Approved scope boundary and responsible owner | What documents govern return of the permanent arrangement? |
What does an incomplete drawing look like?
Illustrative example. A fictional test plan calls for load bank LB-DEMO at a named switchboard. The one-line shows the test-power connection, while the selected equipment schedule indicates a separate auxiliary supply. The temporary-services drawing contains no corresponding auxiliary source. Record the missing reference as an interface issue, with the equipment schedule and drawing revisions.
Send the question to the design and test owners. Do not draw an assumed supply path or treat a spare outlet near the proposed location as an approved solution. The issue is closed by the authorized design evidence, not by a plausible sketch.
Check document identifiers again after the response. A clarified power source that appears under a different label can remain ambiguous to the team reviewing the final pack.
What must be approved outside the drafting review?
The responsible engineering team approves the electrical design and its protection, ratings and interfaces. Authorized site personnel manage actual testing and equipment operations under the approved procedures. Engineering sign-off is performed only by the registered engineer on the job.
Preserve open questions in the drawing issue log and tie their closure to an approved revision. Record which equipment model was reviewed and whether it changed before issue. A manufacturer substitution can reopen the auxiliary-power and layout questions even when the drawing title stays the same.
The completed worksheet should let a reviewer find each design reference quickly. It should not be presented as evidence that the installation is safe to energize or that a test has passed.
Common questions
What else should the bid team know?
Does every load bank need a separate auxiliary supply?
No universal arrangement is assumed. Check the selected equipment manual and approved design.
Can this worksheet be used as a switching procedure?
No. It checks drawing interfaces and evidence only.
What happens if the equipment model changes?
Recheck the affected connection and layout references before closing the review.