Charging with 60W USB C monitor and 87w power brick simultaneously

[chekie]

I am on the market for a USB-C 4k monitor for MacBook pro 15. Possibly LG 27UK850-w if nothing new and affordable comes out in the near future. LG 5k is way out of budget.

But the power delivered by USB C is only 60w, so I will need to use the Apple 87w charger at the same time. My concern is, will plugging in two power sources be bad for MacBook?

I did some googling yet found nothing conclusive. Some cited from Apple's website that Mac only draws power from one source that provides most power. (But it seems like Apple has taken down this information, which is a little worrying.)

An experiment on YouTube back in 2016 seems to suggest multiple chargers may damage mac and cause battery to stop charging altogether:

Anyone here has a similar setup? How does it work for you?
Thank you!

 

[Brookzy]

Some cited from Apple's website that Mac only draws power from one source that provides most power. (But it seems like Apple has taken down this information, which is a little worrying.)

Apple's advice remains the same (https://support.apple.com/en-gb/HT207097):

Because MacBook Pro models from 2016 and later have multiple Thunderbolt 3 (USB-C) ports that you can use for charging, you might wonder if plugging more than one AC adapter into your computer will charge it faster.
Using multiple adapters won't speed up charging, because your Mac only draws power from one AC adapter—even if more than one is plugged in. If you do plug in more than one AC adapter, your Mac will automatically select the single best-suited power source and charge from it.
The best way to charge your MacBook Pro with Thunderbolt 3 is to use the AC adapter that came with the computer. Using an underpowered AC adapter, like those that come with iPad, will make charging slower.​

It is fine to connect a monitor and the 87W adapter. They actually recommend doing so when using the 60W UltraFine 4K monitor with a 15" MacBook Pro (https://support.apple.com/en-gb/HT207447):

The UltraFine 4K won't fully power 15-inch MacBook Pro models because they require 85W. If you try to power your 15-inch MacBook Pro through the display, your notebook's battery will be used during times of heavy activity. To fully power your 15-inch MacBook Pro and charge its battery, connect it to its Apple 87W USB-C power adapter when you use it with the UltraFine 4K.​