arc_flash_mitigation.pdf
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Ourservicesinclude:
Data collection
System modelling and
coordination studies
System operating modes
Arc ash design assessments
Risk assessment and mitigation
Safety warning labels in
compliance with NEC
Contact us
Europe/Asia
Dr Keith McLeay
t +44 141 222 4617
Africa
Robert Wallis
t +27 11 886 6573
USA
Keith Svensen
t +1 781 915 0048
Middle East
Paul Looker
t +971 506 626 568
Whatisarcash?
Arcing faults can occur if the energy available at electrical
equipment is sufcient to maintain a conductive path through theair or insulation from live parts to grounded parts or between two
live parts of different phases. Arcing faults produce ultraviolet
light radiation causing damage to skin, eyes, hearing and igniting
some types of clothing that are within the approach boundaries.
WhatMottMacDonaldcanoer
Improvements to protection system co-ordination, such as relay selectivity,
should be realised to reduce incident energy levels available and arc ash
boundary distances at a given work location while improving reliability. We use
the latest tools SKM Power Tools, ETAP and EDSA to analyse the incident
energy level available from which mitigating alternatives are investigated and
proper personal protective equipment (PPE) levels recommended.
The latest safety standards suggest that arc ash studies are advisable where
a fault analysis or protection relay co-ordination study has not been performed in
recent years. We believe that many facilities require an engineered approach to
identify electrical hazards. A team of highly experienced power systems engineers
at Mott MacDonald is ready to provide this analysis to protect your interests
and personnel.
Nationalstandards
At Mott MacDonald we have a full understanding of the national standards
and owner responsibilities. NFPA 70E Standard for Electrical Safety in the
Workplace provides a standard that covers the aspects of electrical safety-related
work practices and maintenance of the electrical systems. The OccupationalSafety & Health Administration (OSHA) also considers NFPA 70E the recognised
industry practice as based on IEEE 1584 IEEE Guide for Performing Arc Flash
Hazard Calculations methods.
In the UK, the Health and Safety at Work Act, Electricity at Work Regulations and
PPE at Work Regulations require employers to assess the workplace, determine
the hazards present and supply employees with the necessary PPE.
Mott MacDonald is a global management, engineering and development
consultancy with a strong engineering base. With annual revenue of
1 billion, we combine the skills of over 14,000 staff with a strong
presence in 140 countries.
Ourtrackrecord
Our experienced electrical power engineering staff have
a proven track record of carrying out arc studies. We have
undertaken arc ash assessment, review, design evaluation
and implementation and made recommendations for such
clients as:
AMEC Group
BRF
Calpine
Gemma Power Systems
Genzyme
Noble Environmental Power
Northeast Utilities
RasGas
ScottishPower
Technip
www.mottmac.com