I have kept confined myself to major currency pairs not only while scalping but also while using other trading strategies.
before scalping in a proper way traders should choose the broker which allows scalping with no restrictions. otherwise scalping life could be worst.
Scalpers usually trade in shorter time frames. Since they need to be quick in decision, they should trade with pairs that do not have very high volatility. Major pairs, such as EUR/USD and EUR/JPY, make good pairs for scalpers.
this is so comfortable to scalp with all major trading pairs because of their comfortable trading spreads.