Basic Safety Provision for Electrical Installation According to BS 7671
I. Protection against Direct Contact
BS 7671
Provides
1. Insulation of live parts
The insulation is
intended to prevent any contact with live parts.
NOTE 1:
- Live parts shall be completely covered with insulation, which can only be removed by destruction.
- For factory-built equipment, the insulation shall comply with the relevant standards for the electrical equipment.
- For other equipment, protection shall be provided by insulation capable of durably withstanding the stresses to which it may be subjected in service such as mechanical, chemical, electrical and thermal influences.
- Paints, varnishes, lacquers and similar products alone are generally not considered to provide adequate insulation for protection against electric shock in normal service.
NOTE 2:
- Where insulation is applied during the erection of the installation, the quality of the insulation should be confirmed by tests similar to those, which ensure the quality of insulation of similar factory-built equipment.
2. Barriers
or enclosures
Barriers or enclosures are intended to prevent any contact
with live parts.
3. Obstacles
Obstacles are intended to prevent unintentional contact with live parts but not
intentional contact by deliberate circumvention of the obstacle.
4. Placing
out of reach
Protection by placing out of reach is intended only to
prevent unintentional contact.
5. Additional
protection by RCD’s
The use of residual current devices (RCDs) with a
rated operating residual current not exceeding 30 mA, is recognized as
additional protection in case of direct contact in the event of failure of
other measures of protection or carelessness by users.
II. Protection against direct contact
BS 7671 provides
Persons
and livestock shall be protected against dangers that may arise from contact
with exposed-conductive-parts in case of a fault. This protection can be
achieved by one of the following methods:
1. Preventing
a fault current from passing through the body of any person or any livestock;
2. Limiting
the fault current which can pass through a body to a value lower than the shock
current;
3. Automatic
disconnection of the supply in a determined time on the occurrence of a fault
likely to cause a current to flow through a body in contact with
exposed-conductive-parts, where the value of that current is equal to or
greater than the shock current.
NOTE
- In connection with the protection against indirect contact, the application of the method of equipotential bonding is one of the important principles for safety.
Source:
BS 7671
Something else that can be done to help increase protection is to make sure that all the equipment that's being used is in good condition. Insulation sounds like it's one of the main defenses. Overall, when it comes to electrical work, I think it's best to talk with an expert about your project before starting. http://northernpower.net/blog/category/elastimold-power-equipment/
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