UPDATE 1-China c.bank pledges cash support for banks before Lunar New Year

* C.bank to provide temporary liquidity support for some banks

* For 30 days, some banks can lower their RRR by up to 200 bps

* Demand for cash is extra high ahead of the holiday period (Adds details, quotes)

SHANGHAI, Dec 29 (Reuters) - China's central bank on Friday said it will let some commercial banks temporarily keep fewer required reserves, to help them cope with heavy demand for cash ahead of the Lunar New Year.

The People's Bank of China usually provides short-term liquidity support for banks to help deal with greater demand for cash ahead at that time of year.

The move will help "promote smooth money market operations and support financial institutions' financial services before and after the Spring Festival", the central bank said.

In 2018, the first day of Lunar New Year is Feb. 16.

National commercial banks with higher cash demand will be allowed to temporarily keep fewer reserves with the central bank.

According to the PBOC statement, some banks will be allowed to lower their reserve requirement ratios (RRR) by up to 200 basis points, for 30 days.

For major banks, the current RRR rate is 17 percent of their deposits.

The PBOC statement did not specify when the temporary arrangement to make more cash available will begin. (Reporting by Beijing Monitoring Desk, Winni Zhou and Kevin Yao; Editing by Richard Borsuk)