You're right to question the blanket statement that plugging anything into a power strip will melt it. That's an oversimplification and not always true. Here's a breakdown of why power strips can be hazardous and where the problems usually lie

The Core Issue: Overload
The Power Strip's Rating

A typical power strip is rated for a specific amperage (usually 15 amps in the US). This is the maximum current the power strip can safely handle in total across all its outlets.

Total Load Matters

The problem arises when the combined amperage draw of all the devices plugged into the power strip exceeds its rating.

Example

Let's say you have a power strip rated for 15 amps (which at 120V is 1800 Watts). You plug in: A space heater drawing 12.5 amps (1500 Watts) A computer drawing 2 amps (240 Watts) A lamp drawing 0.5 amps (60 Watts)The total amperage draw is 15 amps (12.5 + 2 + 0.5). This puts the power strip at its rated max. If something changes, like the heater turning to its highest power, the power strip will be over its rating and could melt the power strip, trip the breaker or start a fire.

Why Overload is Dangerous Heat Generation

When the power strip is overloaded, the conductors (wires) inside it become resistive and generate excessive heat.

Melting Insulation

The heat can melt the plastic insulation around the wires within the power strip.

Fire Hazard

Molten plastic and exposed conductors are a serious fire hazard.

Damage to Devices

Overload can also damage the devices plugged into the power strip.

Your Observations are Correct



The Weak Link

You're right to suspect that the quality of construction, especially in cheap power strips, is a significant factor. Inexpensive power strips often use thinner wires, lower-quality components, and less robust construction than more expensive surge protectors or power distribution units (PDUs).

Amperage Ratings Can be Exaggerated

The advertised amperage rating on a cheap power strip might be technically true under ideal conditions, but it might not hold up under sustained heavy use. The conductors could overheat even at or slightly below the stated amperage rating.

Plugging into a 20-Amp Circuit

This can exacerbate the problem. The 20-amp circuit breaker won't trip until 20 amps are being drawn from the circuit. The power strip could be severely overloaded (drawing, say, 18 amps) and melting before the 20-amp breaker trips. The breaker is protecting the wiring in the wall, not necessarily the cheap power strip plugged into the outlet.

Surge Protectors vs. Power Strips

It's important to distinguish between a basic power strip and a surge protector. Power Strips

Primarily provide multiple outlets. They may have a circuit breaker (overcurrent protection), but their primary function is to provide more places to plug things in.

Surge Protectors

Power strips with added surge protection circuitry to protect devices from voltage spikes (surges). They will also likely have overload protection in the form of a circuit breaker.

Here's a Summary of How to Avoid Problems


Know the Amperage of Your Devices

Check the labels on your appliances and devices to determine their amperage (or wattage – convert watts to amps by dividing by the voltage, typically 120V in the US).2.

Calculate Total Load

Add up the amperage draw of everything plugged into the power strip.3.

Stay Below the Rating

Make sure the total amperage draw is well below the power strip's rating. It's better to leave a comfortable margin.4.

Avoid High-Draw Appliances

Space heaters, toasters, hair dryers, and other appliances that draw a lot of power should ideally be plugged directly into a wall outlet, not a power strip.5.

Quality Matters

Invest in higher-quality surge protectors or power strips from reputable brands. Look for models with thicker cords, robust construction, and clear safety certifications (like UL listing).6.

Regular Inspection: Check your power strips periodically for signs of damage, such as cracked plastic, frayed cords, or discoloration. Replace them if you find any problems.In conclusion, plugging things into a power strip can* be hazardous if the total load exceeds the power strip's rating, especially with cheap, poorly made power strips. By understanding the principles of electrical load, choosing quality products, and being mindful of what you plug in, you can significantly reduce the risk. Flag for review