Hi,
I think CLB 7 is mandatory for EE...
http://www.cic.gc.ca/english/department/media/notices/2014-12-01.asp#41
13. Will there be a list of eligible occupations for Express Entry?
No. Express Entry will not include an eligible occupation list or occupation caps at the time of launch.
To be eligible to enter the pool, Express Entry candidates must have skilled work experience in a National Occupational Code (NOC) 0, A or B occupation. Jobs offered to candidates in the pool must be in one of these categories.
Job offers are also subject to the LMIA requirements in place at that time.
Candidates must also meet the minimum language requirements (for NOC 0 and A occupations: CLB 7; for NOC B occupations: CLB 5).
http://www5.hrsdc.gc.ca/NOC/English/NOC/2011/Introduction.aspx
NOC skill level criteria - education/training and other criteria
Skill level A
• University degree (bachelor’s, master’s or doctorate)
Skill level B
• Two to three years of post-secondary education at community college, institute of technology or CÉGEP
or
• Two to five years of apprenticeship training
or
• Three to four years of secondary school and more than two years of on-the-job training, occupation-specific training courses or specific work experience
• Occupations with supervisory responsibilities are also assigned to skill level B.
• Occupations with significant health and safety responsibilities (e.g., fire fighters, police officers and licensed practical nurses) are assigned to skill level B.