Please do not leave cooking unattended and follow the instructions on the packaging

We have seen a couple of microwave-related incidents that have led to fire alarm activations. These incidents can be easily avoided by following instructions that advise you to remove certain parts of packaging such as foil, and not leaving cooking unattended.

The images above are from an incident that occurred in a communal staff kitchen at the University. The cooking instructions stated that the metal packaging should be removed when microwaving. The microwave had been left unattended and the room filled with smoke, triggering the fire alarm. Below is some useful advice on microwave safety:

Can I put metal objects in the microwave?

Unlike plastics and ceramics, metals reflect microwaves, which means they cannot pass through. Therefore, if you put your microwave meal in a metal dish, it will not allow it to heat up correctly. Thinner pieces of metals, for example foils, can act as an antenna, which can create sparks. This is extremely dangerous and could cause your microwave to set on fire. It is essential you remember not to put them in your microwave.

Can I put plastic objects in the microwave?

You should only ever microwave things which clearly state that they are microwave safe. Do not use any containers, foam trays or any plastic storage bags that are not specifically designed for microwave use. This is because they could melt and cause damage to you and your appliance. It’s also important to be aware that some microwaveable plastic containers specify a maximum continuous exposure time, so always check the label, or contact the manufacturer for clarification. If in doubt, you could always use a suitable ceramic container instead.

What causes a microwave to spark?

Other than metal objects, any food that has splattered or dripped in the microwave can continue to cook, causing sparks inside your microwave. Make sure microwaves are regularly cleaned and maintained in the office and at home.

What should I do if a microwave is producing smoke?

If there is no fire and it is safe to do so, turn the microwave off at the plug. If an electrical appliance catches fire, do not throw water on it. Only use a fire extinguisher if you are trained to do so and know the correct type of extinguisher to use, in this case a CO2 extinguisher.

Raise the alarm by shouting "fire" to alert persons within the vicinity and activate a break glass call point as you are leaving the building. Call 999 and then call Security on 020 7882 3333 to let them know you have called the Fire Brigade.

Does the University offer any fire safety training?

Yes. All staff are required to complete the Fire Safety Awareness Training every two years. This training is available on QMPlus. We also offer Fire Marshal training to those who are interested in taking on this role for their relevant School, Institute or Directorate. Information about these courses and how to complete them is available here.