J & R Energy Services
Specifying C1D1 LED High Bay Lighting for a Two-Phase Hazardous Location Addition

Industry: Commercial and Industrial Construction

Location: Massachusetts

Challenge: New facility additions were classified as a hazardous location requiring Class I Division 1 (C1D1) rated lighting, and multiple areas needed different light output based on mounting height and footprint.

Solution: We supported fixture evaluation and supplied C1D1-rated LED high bay fixtures in a two-phase rollout using multiple wattages matched to each area’s requirements.

The Challenge: C1D1 Classification and Multi-Area Lighting Needs in New Construction

J & R Energy Services, Inc. is a commercial and industrial construction company located in Plymouth, Massachusetts. They were contracted to build new additions to a facility classified as a hazardous location. That classification immediately changed what “normal” lighting selection looks like.

In a Class I Division 1 (C1D1) environment, flammable gases or vapors can be present under normal operating conditions. In those spaces, lighting cannot be treated like a standard industrial purchase. The fixtures must be appropriate for the classification and installed correctly because any ignition source is unacceptable.

At the same time, this was not a single-room project with one mounting height and one work pattern. Different areas of the new construction required different light output. That meant fixture selection involved more than choosing a “hazardous rated” label and calling it done. The correct approach had to account for what the areas actually needed: coverage footprint, mounting height, beam distribution, and ambient conditions.

J & R Energy Services needed a supplier that could function as a technical resource during the evaluation phase, helping prevent specification errors before fixtures were ordered and installed.

Code and Compliance Requirements

The facility additions required lighting rated for Class I Division 1 (C1D1) environments. In plain language:

• Class I refers to locations where the hazard involves flammable gases or vapors.

• Division 1 indicates that ignitable concentrations can exist under normal operating conditions or frequently due to maintenance, repair, or leakage.

In a C1D1 space, equipment selection is driven by the classified area requirements. It is not enough to choose “industrial” fixtures with high ingress protection. Hazardous location selection also involves matching the site’s specific requirements, including the correct Group and temperature code (T-code) as defined by the facility’s engineering and the authority having jurisdiction.

This project required a compliance-forward approach: select fixtures suitable for a C1D1 classified environment and ensure the decision was grounded in documented requirements rather than assumptions.

Why Fixture Selection Was More Than Just Wattage

When buyers hear “200W, 150W, 100W,” it is easy to assume wattage is the selection decision. In hazardous location lighting, wattage is only one piece of the puzzle.

• Wattage is input power, not a direct measure of usable light Light output and coverage depend on the fixture’s optics and photometrics.

• Mounting height changes everything A space with a high ceiling may require different distribution and output than a lower ceiling area.

• Beam distribution and spacing matter The same fixture can perform very differently depending on footprint and layout.

• Ambient temperature and environment impact reliability Heat, airflow, and exposure conditions affect how fixtures perform over time.
  

For J & R Energy Services, the objective was not to install one fixture type everywhere. The objective was to match light output to each area’s requirements while still meeting the C1D1 hazardous location requirement.

The Solution

We worked with J & R Energy Services to evaluate fixture options and supply C1D1-rated LED high bay fixtures appropriate for a multi-area hazardous location construction project.

The selection approach focused on two priorities at the same time:

1. Classification suitability for the facility’s Class I Division 1 environment.

2. Lighting performance matched to the needs of each area, rather than a one-size-fits-all fixture choice.
   

To support those priorities, the project used multiple fixture wattages across the work areas. This mix reflected a deliberate design approach to match light output to the footprint, mounting height, and task requirements of each space.

Phase 1 and Phase 2 Breakdown

The project was completed in two phases corresponding to the construction of new additions. A phased approach is common in commercial and industrial builds, where different areas are delivered on different schedules.

Phase 1

Phase 1 included the initial construction areas and consisted of:

• 9 units of 200W C1D1-rated LED high bay fixtures

• 6 units of 80W C1D1-rated LED high bay fixtures
  

Phase 2

Phase 2 covered additional new construction areas and added:

• 18 units of 150W C1D1-rated LED high bay fixtures

• 5 units of 100W C1D1-rated LED high bay fixtures

• 3 units of 60W C1D1-rated LED high bay fixtures

• 2 units of 80W C1D1-rated LED high bay fixtures

• 1 unit of 200W C1D1-rated LED high bay fixture

Total Project Scope

Across both phases, the total project was 44 C1D1-rated LED high bay fixtures.

Why Our Selection of C1D1 LED High Bay Fixtures Were the Right Choice

• Hazardous location suitability The required classification was Class I Division 1, which is intended for areas where flammable vapors can be present under normal conditions. C1D1-rated fixtures are designed and listed for use in those classified spaces when installed and maintained properly.

• Correct approach for a multi-area facility Instead of forcing one fixture wattage everywhere, the project used a mix of wattages to match the needs of different footprints and mounting heights.

• Reduced risk during new construction New construction is the ideal time to specify hazardous location lighting correctly. Correct selection at design and procurement time avoids costly retrofits later.

• Better outcomes from evaluation before ordering Working through fixture evaluation before ordering helps contractors avoid specification mistakes that can cause delays, rework, and compliance issues.

• A safer path than “standard industrial” alternatives In a classified space, using non-rated fixtures is not a performance compromise; it is a compliance and safety problem.

Why This Result Was Possible During New Construction

Hazardous location projects are easiest to get right during new construction because the electrical design and procurement plan can be aligned before installation.

1. Classifications drive decisions early When the classified area is documented during design, fixtures can be selected to match the requirements rather than substituted later.

2. Layout and coverage can be planned Mounting heights, spacing, and beam distribution can be evaluated as part of the build, reducing surprises during commissioning.

3. Retrofits are more complex and expensive Retrofitting a classified area after the fact can require rework, downtime, and additional compliance review.

4. Coordination reduces schedule risk When fixtures are evaluated and approved before ordering, contractors avoid delays tied to wrong selections.
   

In this project, the evaluation and phased procurement approach matched the reality of multi-phase construction and reduced preventable mistakes.

The Results

The project delivered a hazardous location lighting solution aligned to the facility’s classified environment and the practical needs of different work areas.

• C1D1 classification requirement met The facility additions received lighting suitable for a Class I Division 1 environment.

• Multi-area lighting requirements addressed Multiple fixture wattages were used to match output to mounting height and footprint instead of applying one fixture size everywhere.

• Two-phase construction supported Fixture supply aligned with the phase schedule and the addition-by-addition construction approach.

• Reduced risk of specification errors Evaluation support helped avoid costly mistakes before ordering and installation.
  

This case study shows that in hazardous locations, lighting selection succeeds when it is treated as a classification-driven engineering decision and validated before installation.

Frequently Asked Questions

What does Class I Division 1 (C1D1) mean?

Class I refers to environments where flammable gases or vapors are the hazard. Division 1 indicates that ignitable concentrations can be present under normal operating conditions or frequently due to maintenance, repair, or leaks.

Is “explosion-proof” the same as “hazardous location rated”?

Explosion-proof is a common term for certain hazardous location equipment. "Hazardous area" is a commonly used term for Class I Division 2 rated equipment, and sometimes "hazardous area" and "hazardous location" are incorrectly used interchangeably. The correct fixture must match the site’s documented classification requirements. In this case, the requirement was Class I Division 1.

Why does C1D1 fixture selection involve more than just wattage?

Wattage is input power, but usable light in a space depends on mounting height, optics, beam distribution, color temperature, spacing, and photometrics. In hazardous locations, selection must also match classification requirements.

Why is new construction the best time to specify hazardous location lighting?

New construction allows the electrical design, layout, and procurement plan to align to the classification requirements before installation. Retrofitting classified spaces later is more complex and can be costly due to shut downs to safely install new equipment. Retrofitting and upgrading from traditional explosion proof lighting to explosion proof LED fixtures is common practice, but safety considerations must be observed.

What information is needed to quote C1D1 LED high bay fixtures?

Typically: the site classification requirements (including Group and T-code), mounting height, layout/coverage goals, ambient temperature and exposure conditions, and available voltage.

Key Takeaways

• C1D1 areas require rated equipment When flammable vapors may be present under normal conditions, lighting must match the classified area requirements.

• Hazardous location selection is not just wattage Footprint, mounting height, beam distribution, and ambient conditions also determine success.

• Mixed wattages can be intentional Using multiple wattages can reflect an area-by-area approach rather than a one-size-fits-all fixture choice.

• New construction reduces risk Correct specification during design and procurement avoids costly hazardous location retrofits later.

• Evaluation support prevents expensive mistakes Working with a technical resource before ordering helps contractors avoid delays and compliance issues.

Hazardous location lighting is most successful when fixtures are selected to match both the classified area requirements and the real-world lighting needs of each space, especially during new construction. To learn more about solving lighting challenges in hazardous location environments, contact Sanzo Sales.