Okay, Dave, let's break down this transformer situation and try to figure out if it's worth your time.

First Impressions and Your Assessment

Your initial assessment is solid. The fact that it was installed due to the tanning salon's power issues suggests it was likely used for isolation and possibly voltage regulation/conditioning.

Interpreting the Transformer's Specs Single-Phase

You're correct that the building likely has single-phase service. Tanning beds run on 240V, which is common.

Primary Voltage (228-252V)

This is the voltage range the transformer is designed to accept as input. It's a pretty standard range for single-phase 240V service.

Secondary Voltage (240V) and KVA

Here's where things get interesting. Let's consider the different secondary outputs on the nameplate, and why these are the most relevant factors when considering the transformer's value on the market.

240V @ 2.2 KVA

This is the most important spec to understand. This suggests it can provide a relatively small amount of isolated 240V power. KVA stands for kilovolt-amperes, which is a measure of apparent power. 2.2 KVA means 2,200 volt-amperes. At 240V, 2.2 KVA would allow you to run about 9 amps (2200 VA / 240 V = 9.17 amps). This is enough for one tanning bed, or a portion of one.

240V @ 5.0 KVA

This output has a higher capacity. It is important to verify whether it is isolated or not. At 240V, 5.0 KVA would allow you to run about 20.8 amps (5000 VA / 240 V = 20.8 amps). This would be sufficient for a tanning bed and associated equipment.

400V @ 5.0 KVA

This output could be used for equipment that requires a high voltage supply. At 400V, 5.0 KVA would allow you to run about 12.5 amps (5000 VA / 400 V = 12.5 amps).

Why So Big (400 lbs)? Transformers are essentially iron and copper (or aluminum) coils. Larger KVA ratings typically require larger cores and windings, hence the weight. If the transformer is very well built, it might be larger than you would expect for these KVA ratings. Isolation

The fact that the utility required it after the initial issue strongly suggests isolation was the primary function. This is because it electrically separates the tanning salon's load from the building's main service. This prevents the tanning salon's equipment (with its potentially harmonic-rich or sensitive loads) from interfering with other tenants.

Market Value Considerations

This is the critical question. Here's my assessment: Low Demand for that Specific Configuration

A 240V to 240V isolation transformer with relatively low KVA is a niche item. The 400V output provides added versatility, but might narrow the market, as well. Most general-purpose applications needing isolation don't need those exact voltage combinations.

New vs. Used

New isolation transformers are readily available. Used ones are generally only attractive if they are significantly cheaper.

Scrap Value

The most likely guaranteed value is scrap metal. You'll get paid by the pound for the copper and iron. Check current scrap metal prices in your area. 400 lbs of transformer scrap might fetch $50-$150, maybe a bit more depending on the relative proportions of copper and steel.

Potential Buyers

This is difficult, and depends on local demand, but here are a few possibilities:

Other Tanning Salons

Unlikely. Newer equipment is often more efficient, and buying a used transformer for isolation is a gamble.

Businesses with Sensitive Equipment

The isolation feature could be valuable in industries with voltage fluctuations or equipment sensitive to electrical noise. Think: Small machine shops with older CNC equipment Audio/video production studios Laboratories

Hobbyists/Experimenters

Some hobbyists might be interested in a transformer for projects, but the voltage may be inappropriate for their needs.

Repair Shops

A transformer repair shop might be interested in buying the unit to harvest high quality components.

Is it Worth It? My Recommendation

Here's my take:1. Low Probability of High Resale Value

Don't expect to get rich. You're likely looking at a small profit at best, and potentially just covering your costs.2.

Factor in Your Time and Costs

Consider:

30-mile trip each way (60 miles total)

Gas, wear and tear on your vehicle, your time driving.

Effort of Removal

How difficult is it to physically remove and load the transformer? Do you need extra help?

Effort of Selling

Photographing, listing, communicating with potential buyers, arranging for pickup/delivery if you sell it.3.

Compare to Alternatives

What else could you be doing with that time?

My Recommendation

Unless you really enjoy these kinds of projects, or you know someone who immediately needs this specific type of transformer,

I'd probably pass on it.

The scrap value is likely your worst-case scenario.

If You Decide to Proceed


Double-Check Disconnection

Ensure it's completely disconnected from the power source. Use a multimeter to verify zero voltage on all terminals. Safety first!2.

Photograph and Document

Take good photos and document the transformer's specs (nameplate). This will be essential for selling.3.

List it for a Reasonable Price

Check eBay and other online marketplaces for similar transformers to get an idea of the market. Start high (but not ridiculously high) and be prepared to negotiate.4.

Be Prepared to Scrap It: If it doesn't sell in a reasonable amount of time, take it to the scrap yard and be done with it.Good luck, Dave! Let me know if you have any more questions. Flag for review