Planning a Shutoff in a Home With Medical Equipment

Why this matters

A panel change, a meter pull, a repipe or a main valve replacement takes the whole house down for hours. In most homes that is an inconvenience. In a home where someone uses oxygen, dialysis or a powered mattress, it is a medical event that the family has to plan around, and they can only plan if the shop tells them early, precisely and honestly. The failure is rarely dramatic negligence. It is an outage that ran two hours longer than quoted, against a backup sized for the quote. This article is the planning sequence; why the question has to be asked at all, and how each device behaves without power, is covered in its own card. See related: Customers Who Depend on Medical Equipment at Home.

The steps

1. Ask, at the quote, and ask for the person who manages the equipment. "Does anyone use medical equipment that runs on power or water?" goes on the estimate visit, not just the booking call, because a planned shutoff is scheduled days ahead. If the answer is yes, ask who manages it (the patient, a spouse, an aide, a supplier) and get that person's phone number and the equipment supplier's number. Skip it and the first anyone hears of the concentrator is when it alarms with the meter already pulled.

2. Name exactly what the shutoff takes out. Whole house or one circuit? Main water or one branch? For a meter pull or service change, everything goes, including the fridge holding insulin and the well pump. For water, a main shutoff also stops a home hemodialysis machine's feed and may stir sediment when it comes back. Write the list down with the caregiver. Skip it and someone plans for the concentrator and forgets the medication fridge.

3. Size the outage honestly, then pad it. Estimate the time from power off to power proven back on, including anything outside your control: the utility's reconnection appointment, an inspection that has to happen before the meter goes back in, a part you have not yet seen. Then the backup is sized against a shop rule of 1.5 times the planned outage, a starting point you can tune. The margin exists because the outages that go long are the ones with a third party in them. Skip it and the backup is sized to the best case.

4. Have the caregiver or supplier confirm the backup covers it. The family, not the tech, confirms what the backup can do, because only they know the flow rate, the battery age, and how full the cylinders are. Where the backup is short, the fixes in rough order of preference are: more supply delivered by the equipment supplier; the patient spending the outage somewhere else; a portable generator for the device. A generator runs outdoors, at least 20 ft from doors, windows and vents per CDC carbon monoxide guidance, feeds the device through a properly rated cord, and is never connected to the house wiring without a listed transfer switch installed to NFPA 70 Article 702, because backfeeding a panel can energize the utility line and kill a lineworker. Skip it and the plan rests on a number nobody read off a gauge.

5. Schedule around the care, not the crew. Ask when treatments run and when the caregiver is present. Avoid a dialysis session day, avoid overnight work where a CPAP or ventilator is in use, and pick a time when the person who manages the equipment will be home throughout. Skip it and the shutoff lands in the middle of a four-hour dialysis run.

6. Put it in writing for the household and, where relevant, the utility. Give the caregiver a one-page note: start time, expected end, the padded end the backup was sized for, the tech's mobile number, and what will be off. For a meter pull, ask the household whether they are on their utility's medical or life-support registry; the utility may want notice. Skip it and the caregiver who planned the day hears a different end time from each person they ask.

7. Keep the outage short by staging everything first. Have the new panel pre-wired as far as it can be, the valves, fittings and pipe cut and laid out, and tools at the work point before anything is shut off. The clock starts at the shutoff, not at arrival. Skip it and the planned five hours becomes seven because the crew starts staging after the power is off.

8. Restore, then confirm the device is running, with the caregiver. After you have proven the work and restored service, the caregiver switches the device back to normal operation and confirms it is running and the patient is well. For water, tell a dialysis household that the supply was interrupted so they can follow their own pre-treatment flushing and testing; for a medication fridge, the caregiver checks the fridge temperature. Skip it and you leave on the assumption the device restarted, which some do not without a button press. Hazard at restore: when energizing a new panel, stand to the side of the panel face, close the main with the branch breakers off, then bring circuits up one at a time so a fault announces itself on one circuit, not in front of you.

9. Write it into the customer record. Note the devices, their circuits or supply, the backup and how long it lasted, and anything that ran long. Skip it and the next shutoff at this address starts from zero.

Worked example: the panel change that ran long

The job. A 100 A panel replaced with a 200 A panel. The utility will pull the meter and reconnect after the inspector releases the job. The shop plans a 5-hour outage. The homeowner's husband uses an oxygen concentrator at 3 liters per minute (L/min), around the clock; his insulin is in the kitchen fridge.

Step 4, sized against the rule. The rule asks the backup to cover 1.5 times 5 hours, which is 7.5 hours. He has two E cylinders, both reading 2,000 psi. Using the E-cylinder factor of 0.28 liters per psi and a 200 psi reserve: 2,000 minus 200 is 1,800 psi; 1,800 times 0.28 is 504 liters per cylinder; 504 liters at 3 L/min is 168 minutes, 2.8 hours. Two cylinders give 5.6 hours. 5.6 is below 7.5, so the backup fails the rule even though it covers the 5-hour quote. The wife calls their supplier, who delivers a third E cylinder two days before the job. Three cylinders give 3 times 2.8, which is 8.4 hours, above 7.5. Pass. The insulin goes into a cooler with ice packs for the day, per its label.

Step 5. The job is booked for a Tuesday, 8:00 am start, with the wife home all day. A daughter is on call to take him to her house if anything changes.

The day. The note given to the household, and what actually happened:

PLANNED                     ACTUAL
08:00 meter pulled          08:05 meter pulled
08:00 cylinder 1 on         08:05 cylinder 1 on
10:48 cylinder 2 on         10:53 cylinder 2 on
12:30 inspection            12:40 inspector arrives
13:00 utility reconnect     13:41 cylinder 3 on
13:00 concentrator back     14:15 utility reconnects
                            14:20 concentrator back
                            16:29 cylinder 3 would empty

The utility crew came 75 minutes late. The outage ran 6 hours 15 minutes, from 8:05 to 14:20. With two cylinders and no third, oxygen would have run out at 8:05 plus 5.6 hours, about 13:41, which is 39 minutes before the concentrator came back. The third cylinder, bought only because of the 1.5 times rule, still had 8.4 minus 6.25, about 2.15 hours (129 minutes), in it when the concentrator came back, which matches the gap between 14:20 and 16:29.

Step 8. The tech energizes the main with branches off, brings circuits up one at a time, and the wife switches the concentrator back on and checks her husband's pulse oximeter reading before the crew packs up. The cooler goes back into the fridge.

What changes the answer. If he had been at 2 L/min, each cylinder lasts 4.2 hours and two give 8.4 hours, so no third cylinder is needed under the same rule. If the job had been a water main replacement in a home hemodialysis household, the sizing would be in treatment sessions rather than hours: the shutoff is scheduled on a non-treatment day and the family confirms with their clinic how the system should be flushed before the next run. And if the patient's care does not allow any interruption, no backup is enough; the shutoff happens with the patient out of the house.

When there is no time to plan

Sometimes the shutoff is forced: a panel smoking, a burst supply line flooding toward a receptacle, a gas leak that takes the water heater with it. The hazard comes first, always. Kill the power or close the valve that stops the immediate danger, without waiting to ask about equipment, because a fire or an electrocution helps nobody in the house.

Then, inside the first minute, do the planning sequence in miniature. Say out loud to whoever is home that the power or water is off and ask whether anyone uses equipment that needs it. If someone is on oxygen, the caregiver switches to the backup cylinder now and reads the gauge to you, and you work out together how long it lasts at their flow rate. If there is no backup, or it covers less than the time to make the house safe and restore, call 911 for the oxygen-dependent person rather than racing the clock; responders can bring oxygen and move the patient. For dialysis, the patient or partner ends any running treatment the way their clinic trained them. Restore the unaffected circuits as soon as the faulted one is isolated, because the fastest way to shorten a forced outage is usually to shrink it to the part of the house that is actually broken.

How to check the plan before the day

• The devices, their circuits or supply, and the caregiver's number are written down.
• The backup duration was computed from a gauge or battery reading by the family, and it is at least 1.5 times the planned outage.
• The household has the written note with the padded end time.
• Everything is staged before shutoff, and the restore order is planned.
• The record is updated with how long the outage actually ran.

References

• CDC guidance on preventing carbon monoxide poisoning from portable generators (outdoor placement, distance from openings).
• NFPA 70, National Electrical Code, Article 702 (optional standby systems and transfer equipment), in the edition your jurisdiction has adopted.
• Oxygen supplier and equipment manufacturer instructions (cylinder handling, duration, power requirements).
• See related: Customers Who Depend on Medical Equipment at Home; The Vulnerable Household No Heat or No Water Escalation SOP.