Electrical requirements

The most common way a chamber purchase goes wrong is that it arrives and cannot be turned on properly. That happens because electrical requirements are the specification manufacturers publish least consistently — some publish a circuit, some publish a voltage, and some publish nothing at all. This page shows you exactly what is and is not published, so you know which questions have to be answered in writing before an electrician quotes.

What is actually published, verbatim

The pattern is worth stating plainly. The only piece of equipment in that table with a published power draw is the oxygen concentrator. Every chamber compressor in it is published as a circuit requirement or a voltage, or not at all. That means you cannot size a supply, estimate a running cost, or decide whether two devices can share a circuit from published data. You have to ask.

Why "it runs on a household outlet" is not the end of the conversation

A published requirement of "Standard 120V / 15 AMP Circuit" (Summit to Sea Grand Dive specifications) describes the circuit, not the outlet. In a typical residential installation, one 15 A circuit serves several outlets across more than one room. The relevant question is not whether there is a socket near the chamber; it is what else is already on that circuit and what the total load will be when the chamber's compressor and a 590 W concentrator (AirSep NewLife Intensity 10 published specification) are both running while someone in the next room uses something else.

A second point that follows from the published data rather than from opinion: the Fortius 420 is published with a UL-certified compressor at 110–120 V and 1/3 hp (OxyHealth). A 1/3 hp motor is a real inductive load with a starting surge. The specification does not tell you what that surge is. Your electrician needs it to decide whether an existing circuit will hold, and only the manufacturer has it.

Grounding is a safety requirement with a named source

FDA's 2025 letter to health care providers includes, among its recommendations for reducing fire risk, ensuring that "the HBOT device is properly grounded," alongside awareness of "a heightened risk of fire with use of oxygen at a high concentration," maintained staff training, control of prohibited items "including electrical or static devices," and clothing "made of hyperbaric compatible materials … such as cotton" (FDA Letter to Health Care Providers, 25 August 2025).

Grounding matters here for a specific published reason: electrostatic sparks are a documented ignition mechanism in hyperbaric oxygen (Ignition by electrostatic sparks in hyperbaric oxygen). UHMS notes the humidity relationship in the same territory: ">60 percent humidity will nearly eliminate static potential," and antistatic procedures are called for whenever chamber atmospheres exceed 23.5% oxygen, whereas Class A chambers are typically maintained below 23.5% oxygen with fire suppression in place (UHMS standards and codes FAQ). Grounding, humidity and oxygen fraction are one connected problem, not three separate boxes to tick.

Extension cords, power strips and surge protectors

We are not going to cite a rule that does not exist. What we can say from the published record is that FDA's guidance is to follow the manufacturer's instructions for use, and specifically recommends "reviewing operator manuals and instructions for use for information on device operation, maintenance, and fire prevention and safety measures" (FDA, 25 August 2025). Most compressor manufacturers prohibit extension cords in their instructions; whether yours does is a question for your manual, and the manual governs. Ask for the manual before purchase, not after delivery.

Commercial installations add standby power

If the installation is a commercial or healthcare one, the electrical scope widens. UHMS advises that a generator should hold "24 hours of fuel," with 96 hours recommended in areas prone to extended outages, and treats the chamber room as a medical treatment room rather than incidental space: "The room housing your hyperbaric chambers is designed to provide medical treatment – therefore, it is a medical treatment room and not a storage closet" (UHMS standards and codes FAQ).

NFPA 99 Chapter 14 also requires that where a Class A or Class B chamber is housed, "the room or rooms … shall be for the exclusive use of the hyperbaric operation," and that a sprinkler system to NFPA 13 or a water mist system to NFPA 750 be installed in that room and in ancillary equipment rooms (NFPA 99, 2015 edition, clauses 14.2.1.1.7 and 14.2.1.2; your authority having jurisdiction determines the applicable edition). Suppression systems have electrical supervision requirements of their own, so the electrical and fire-protection scopes are designed together, not sequentially.

How to brief an electrician properly

Hand them documents, not descriptions. Specifically: the manufacturer's installation section from the manual; the amps-at-load figures for chamber and concentrator obtained in writing; the starting-current figure; the manufacturer's statement on dedicated circuits; the room's intended layout showing where each device sits; and, for commercial work, the chamber's NFPA 99 class and whatever your authority having jurisdiction requires. Then ask them for a permit path, because in most jurisdictions a new dedicated circuit is permitted work.

If a seller cannot supply the amps-at-load and starting-current figures, that is a meaningful signal. It is a normal thing for a manufacturer to know about its own compressor.