Here is the IELTS requirement until end of last year.
Using your test results
Once you have taken a language test from a designated testing agency, you can determine if you meet the language requirements for CEC.
If you have qualifying Canadian work experience at Skill Type 0 or Skill Level A of NOC, your test results must match the CLB/NCLC below (see chart):
7 or higher for each of the language abilities, or
6 for any one of the language abilities, 7 or higher for any other two of those abilities and 8 or higher for the remaining ability,
If you have qualifying Canadian work experience at Skill Level B of NOC, your test results must match the CLB/NCLC below(see chart):
5 or higher for each of those abilities, or
4 for any one of those abilities, 5 or higher for any other two of those abilities and 6 or higher for the remaining ability.
International English Language Testing System (IELTS)
The CEC requirements for the International English Language Testing System (IELTS) are:
NOC CLB Level Test result for each ability
Speaking Listening Reading Writing
0, A 8 6.5 7.5 6.5 6.5
0, A 7 6.0 6.0 6.0 6.0
0, A, B 6 5.5 5.5 5.0 5.5
B 5 5.0 5.0 4.0 5.0
B 4 4.0 4.5 3.5 4.0
From early this year, this has been changed.
http://www.cic.gc.ca/english/information/applications/guides/5609ETOC.asp
Using your test results
Once you have taken a language test from a designated testing agency, you can determine if your test results meet the language requirements for the CEC.
If you have qualifying Canadian work experience at Skill Type
0 or Skill Level A of NOC, your test results must match the CLB/NCLC levels set by the Minister in all four language abilities: www.cic.gc.ca/english/immigrate/cec/language-testing.asp.
If you have qualifying Canadian work experience at Skill Level B of NOC, your test results must match the CLB/NCLC levels set by the Minister in all four language abilities: /english/immigrate/cec/language-testing.asp.
Note: If you have Canadian work experience in both NOC 0/A and B occupations, you must submit language test results that meet the language proficiency requirements for the occupation in which you obtained the majority of your work experience during the three years preceding the date of application.
Hope this helps Toby