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  1. ✓Find scope
  2. 2Governing rule
  3. 3Resolve conflicts
  4. 4Verify equipment

Step 2: Read the governing requirement. On the feature page, start with the Most Restrictive Requirement, then review applicable standards and the lead authority.

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FOW-ELE-015Critical

Lightning Protection

Lightning Protection: design, construction and commissioning within a defense energetics production facility.

Most Restrictive Requirement
NFPA 70

NEC Class/Division classification governs; IEC Zone equipment requires NRTL listing.

Design Criteria

Hazard Division
1.1
NFPA 70 Table 3-1
Max Net Explosive Weight
50 lb NEW
NFPA 70 Para. 4.2
Inhabited Building Distance
400 ft
NFPA 70 Table 8-9
Hazardous Area Classification
Class I Div 1 / Zone 1
NFPA 70 Art. 500/505
Required SIL
SIL 1
NFPA 70 IEC 61511 §9
Sprinkler / Deluge Density
0.20 gpm/ft²
NFPA 70 Ch. 11

Illustrative values — confirm against the cited edition before design use.

Summary

Discipline
Electrical
Category
Electrical
Risk Level
Critical
Approval Authority
Electrical Safety Authority
Standards Applied
9 across 5 families
Verified Links
4 of 9 approved
Common Equipment
Ex Junction Box, Explosion-Proof Motor, Motor Control Center, Medium-Voltage Switchgear

Applicable Standards (9)

Electrical
Hazardous Areas

Governing Authorities

  • Electrical Safety Authority
    Electrical AHJ · Electrical installations, arc flash, hazardous locations
    Lead

Highest Risk Items

  • Lightning strike in explosive areaMedium
    Administrative controls, periodic inspection and documented procedures.
  • Generator failure during emergencyMedium
    Administrative controls, periodic inspection and documented procedures.

Known U.S. / European Conflicts (8)

NFPA 70↔IEC 60364· Low-voltage installationsPartial
Partial alignment; supplemental U.S. testing or documentation required.
UL 508A↔IEC 60204-1· Industrial machinery electricalPartial
Partial alignment; supplemental U.S. testing or documentation required.
IEEE 1584↔IEC 61482· Arc flashSignificant Difference
Fundamental differences; requires AHJ/NRTL review and likely redesign or re-certification.
NFPA 496↔IEC 60079-2· Pressurized enclosuresSimilar
Requirements broadly equivalent; document equivalency in design analysis.
NFPA 70↔DIN EN ISO 13849-1· Enclosure ratingsSimilar
Requirements broadly equivalent; document equivalency in design analysis.
NFPA 496↔2014/34/EU· Surge protectionPartial
Partial alignment; supplemental U.S. testing or documentation required.
UFGS 26 13 00↔EN 764-7· Welding inspectionSignificant Difference
Fundamental differences; requires AHJ/NRTL review and likely redesign or re-certification.
UFC 3-575-01↔DIN EN ISO 13849-1· Alarm managementSimilar
Requirements broadly equivalent; document equivalency in design analysis.

Equipment Impacted (4)

Ex Junction BoxExplosion-Proof MotorMotor Control CenterMedium-Voltage Switchgear