Customers Who Depend on Medical Equipment at Home

Why this matters

More people are kept alive or comfortable at home by powered and water-fed equipment than most tradespeople realize: oxygen concentrators, dialysis machines, ventilators, pressure-relieving mattresses, medication fridges. A tech who flips a breaker, closes a main or lights a torch without knowing one is running can do more harm in ten minutes than the repair will ever fix. None of it is visible from the panel or the meter, and the person using it may be asleep in a back room. That is why every power or water shutoff in a residential home starts with a question, and why oxygen changes what "hot work" means.

What the equipment is and what an outage does to it

The pattern: equipment designed to fail safe has a battery and an alarm; equipment that does not, like a concentrator or a CPAP, simply stops. And the water side is easy to forget: home hemodialysis depends on the supply being on and clean, so a water shutoff, a pressure test or a flush that stirs sediment is a medical event in that house.

Why every shutoff starts with a question

Techs rely on what they can see, and none of this can be seen from where the work happens.

• Panel labels are unreliable. A breaker marked "attic" can feed half a bedroom. You cannot know which outlet a concentrator is plugged into without asking or testing.
• The device may be in a room you never enter. The tech in the basement does not see the bed upstairs.
• The user may not be the person who let you in. A spouse answers the door; the patient is asleep.
• Backups are finite and nobody knows how full they are until someone reads the gauge.

So the question is asked twice: at booking ("Does anyone in the home use medical equipment that runs on power or water: oxygen, dialysis, a breathing machine, a special mattress, medicine in the fridge?") and again at the door before any shutoff. A yes at either point means the shutoff gets planned, not just done. The planning steps have their own article. See related: Planning a Shutoff in a Home With Medical Equipment.

Oxygen, flame and sparks

Medical oxygen does not burn. It makes everything else burn faster, hotter and from a smaller ignition source. In an oxygen-enriched atmosphere, air with more than the normal roughly 21 percent oxygen, materials that would smoulder in ordinary air catch and flare, and fabric, hair and bedding near a cannula soak up oxygen and stay enriched for a while after the flow stops.

What that means for trade work in a home with oxygen in use:

• No open flame or spark-producing work in the room where oxygen is flowing or stored. That covers brazing and soldering torches, grinding and cutting discs, heat guns, and a striker or lighter used to check a pilot. NFPA's home oxygen safety guidance puts cylinders at least 5 ft from heat sources and open flames; many oxygen suppliers say 10 ft from open flame. Use the larger figure, and treat the whole room as the zone when you cannot measure.
• Before hot work anywhere near it, ask the patient or caregiver to switch the oxygen off (they do this, not you), move the patient and equipment to another room if their care allows, and ventilate the work room with an open window for several minutes so enriched air disperses. If the patient cannot be off oxygen or moved, the hot work waits or uses a cold method (a press fitting instead of a sweat joint, a mechanical cut instead of an abrasive one).
• Keep petroleum products away from the cannula and regulator. Petroleum lubricants and oil-based products near oxygen fittings are an ignition risk; never lubricate an oxygen regulator or fitting yourself.
• Never handle the patient's oxygen equipment beyond moving it at their direction. Changing a regulator, adjusting a flow rate or swapping a cylinder is the patient's, caregiver's or supplier's job.

The note on the customer record

When the answer is yes, the shop records it where every dispatcher and tech will see it before the next visit, written as a fact about equipment, not a diagnosis.

CUSTOMER RECORD - SITE NOTES
Medical equipment in home: YES
  - Oxygen concentrator, back bedroom (BR2)
    Runs on BR2 / attic breaker (tested 3/14)
    Backup: E cylinders in BR2 closet
  - Insulin in kitchen fridge
Before ANY power or water shutoff:
  ask for caregiver (wife, same phone number)
No open flame in BR2. Use press fittings there.
Source: customer's wife, booking call 3/12

Keep it short, keep it to equipment and location, and record who told you and when. Health details beyond what the next tech needs to work safely do not belong on a shop record. See related: Writing a Safety Flag on a Customer Record Without Defaming Them.

Worked example: the breaker marked "attic"

The job. A blower motor replacement in the attic air handler. To work safely the tech needs the air handler in the attic de-energized, and the panel shows one breaker labeled "attic." At booking, the CSR asked the medical-equipment question; the customer's wife said her husband uses an oxygen concentrator at 2 liters per minute (L/min), continuously.

At the door. The tech asks where the concentrator is plugged in: back bedroom. Before switching anything, he plugs a circuit tracer's transmitter into the spare half of that duplex outlet and runs the receiver along the panel, so the concentrator never loses power. It signals on the attic breaker. The breaker feeds both. Without the booking question, the next step would have been the tech switching off the attic breaker and climbing into the attic while a concentrator alarmed in a room he never saw.

Choosing the cover. Two options:

• Move the concentrator to an outlet on another circuit. The hallway outlet traces to a different breaker. The wife moves the concentrator and plugs it directly into the wall, no extension cord (most concentrator manuals prohibit one).
• Switch to the backup cylinder for the outage. The E cylinder's gauge reads 1,800 psi. Using the standard E-cylinder factor of 0.28 liters per psi and holding back a 200 psi reserve: 1,800 minus 200 is 1,600 psi; 1,600 times 0.28 is 448 liters; 448 liters at 2 L/min is 224 minutes, about 3.7 hours, without a conserving device.

The motor swap is estimated at 40 minutes with the breaker off. Either option covers it; the cylinder covers it more than five times over. The couple choose the hallway outlet because it leaves the cylinder full for a real outage. The wife moves it, confirms it is running and her husband's reading is normal on his own pulse oximeter, and only then does the tech switch the breaker off and lock it.

Restore. Breaker back on, air handler and condenser tested, and the tech confirms with the wife that the concentrator is still running in the hallway before she moves it back. The site note above is written into the record so the next tech does not have to rediscover the shared circuit.

What changes the answer. At 4 L/min the same cylinder lasts half as long, about 1.9 hours. A cylinder reading 500 psi gives (500 minus 200) times 0.28, which is 84 liters, or 42 minutes at 2 L/min, which does not cover a 40-minute job with any margin. And if the work had been brazing in the back bedroom rather than a blower motor in the attic, the oxygen-and-flame rules above apply before anything about circuits.

How to check your own handling

• The medical-equipment question was asked at booking and again at the door.
• You confirmed which circuit or water supply the device is on by testing, not by the panel label.
• The patient or caregiver handled the device; you handled the circuit.
• Any backup time was computed from a gauge reading you saw, not assumed.
• No flame or sparks in a room with oxygen in use, and the site note records it.
• The device was confirmed running after you restored service.

References

• NFPA, home medical oxygen safety tip sheet (distance from heat sources and open flame, no smoking).
• Oxygen supplier and concentrator manufacturer instructions (extension cords, regulator handling).
• U.S. Food and Drug Administration, guidance on home use of medical devices during power outages.
• See related: Planning a Shutoff in a Home With Medical Equipment; The Vulnerable Household No Heat or No Water Escalation SOP; Writing a Safety Flag on a Customer Record Without Defaming Them.