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How Often?

The following table (and notes) is an extract from the fourth edition of the IET Code of Practice for In-Service Inspection and testing of Electrical Equipment. It is only intended to provide guidance on initial Test frequencies, the periods stated should only be used as a starting point where previous inspection and testing records and risk assessments are not available. Ongoing frequencies should and indeed must be determined from a risk assessment.

 

IET Suggested Initial Frequency of Inspection and Testing of Equipment

 

Type Of
Premises

Type Of
Equipment

User
Checks

 

(not recorded
unless a fault
is found)

Class I

Class II
(Note 7)

Formal Visual
Inspection

(Note 1)

Combined
Inspection and
Testing

Formal Visual
Inspection

(Note 1)

Combined
Inspection and
Testing 

Construction
Sites
110V
equipment
(Note 6)

S    (Note 2)
IT  (Note 2)
(Note 2)
(Note 2)
(Note 2)

None
N/A
Weekly
Weekly
Weekly

1 month
N/A
1 month
1 month
1 month

3 months
N/A
3 months
3 months
3 months

1 month
N/A
1 month
1 month
1 month

3 months
N/A
3 months
3 months
3 months

Industrial
including
commercial
kitchens
(Note 6)

S
IT
M
P
H
F

Weekly
Weekly
Before Use
Before Use
Before Use
3 months

None
None
6 months
6 months
6 months
12 months

24 months
24 months
12 months
6 months
6 months
24 months

None
None
6 months
6 months
6 months
12 months

24 months
24 months
24 months
12 months
12 months
48 months

Equipment
used by the
public
(Notes 3, 4 and 6)

S
IT
M
P
H
F

Weekly
Weekly
Weekly
Before Use
Before Use
Weekly

Monthly
Monthly
Weekly
Weekly
Weekly
12 months

12 months
12 months
6 months
6 months
6 months
36 months

12 months
12 months
6 months
6 months
6 months
12 months

24 months
24 months
12 months
12 months
12 months
36 months

Schools

(Note 4 and 6)

S
IT
M
P
H
F

Weekly
Weekly
Weekly
Weekly
Before Use
Weekly

None
None
6 months
6 months
6 months
12 Months

12 months
12 months
12 months
12 months
12 months
36 Months

12 months
12 months
12 months
12 months
12 months
12 Months

48 months
48 months
48 months
48 months
48 months
48 months

Hotels

(Notes 5 and 6)

S
IT
M
P
H
F

None
None
Weekly
Weekly
Before Use
Weekly

24 months
24 months
12 months
12 months
12 months
24 months

60 months
60 months
24 months
24 months
24 months
48 months

24 months
24 months
24 months
24 months
12 months
24 months

None
None
None
None
None
None

Offices and
Shops

(Note 6)

S
IT
M
P
H
F

None
None
Weekly
Weekly
Before Use
3 Months

24 months
24 months
12 months
12 months
12 months
24 months

60 months
60 months
24 months
24 months
24 months
48 months

24 months
24 months
24 months
24 months
12 months
24 months

None
None
None
None
None
None

 

Note:

1.  The formal visual inspection may form part of the combined inspection and tests when they coincide, and is to be recorded.

2.  110 V earthed centre-tapped supply. 230 V portable or hand-held equipment is required to be supplied via a 30mA RCD and inspections and tests may
need to be carried out more frequently, (e.g. a check of a portable RCD, via its manual test button)

3.  For some equipment such as children’s rides or equipment in more onerous environments a daily check may be necessary.

4.  By supervisor/teacher/member of staff.

5.  Equipment provided in hotel rooms is equipment used by the public. Equipment in hotels is considered to be equipment in hotels used by the hotel staff.

6.  Hired equipment, in use for periods in excess of 1week, should be included on an equipment register and a risk assessment carried out to determine the future frequency
of inspections and testing, unless the equipment is covered by a supplier’s lease and maintenance contract, providing the maintenance contract is robust and satisfactory.

7.  If the class of construction is not known it should be considered to be Class I.


•   It is normally not necessary to test new items of equipment as the manufacturer has already tested them
•   Battery operated equipment less than 40 volts requires no visual or in-service inspection and testing, Charging equipment however will normally require visual and/or in-service
inspection and testing according to its class of manufacture.

Note: Specific guidelines for battery drills etc. used in mines, is not within the scope of this guidance.

The information on suggested initial frequencies above is more detailed and specific than HSE Guidance, but is not considered inconsistent with it.