Procurement Checklist: 12 Questions Before Ordering Portable Earthing & Short-Circuit Kits
Portable earthing and short-circuit kits should be purchased like engineered safety equipment, not like generic accessories. OSHA requires portable grounding cables and clamps to carry and withstand the maximum available fault current for the time needed for the protective device to clear the fault, and it notes that some situations may require two or more leads in parallel. IEC 61230 also makes clear that this category of equipment is intended for temporary earthing or earthing and short-circuiting on electrically isolated or de-energized AC and DC installations and networks, whether overhead or underground, low or high voltage.
If you only ask for “an IEC 61230 kit,” you still have not defined the fault duty, configuration, clamp style, marking, traceability, inspection status, or post-fault replacement rule that determine whether the kit will be usable and defensible on site. Guidance for portable earths also expects the delivered equipment to be marked with the model or type reference, rating, conductor cross-sectional area, and either the next test due date or a unique number for a register. New portable earths should also have their DC resistance measured and recorded.
The short answer
Before ordering portable earthing and short-circuit kits, you should confirm the application, fault duty, conductor size, clamp interface, marking, traceability, inspection control, and replacement logic. That is the fastest way to avoid buying a kit that is nominally compliant but wrong for the actual work point.
Why this is a procurement issue, not just a technical issue
A portable earthing kit is tied directly to worker protection and fault-clearing behavior. OSHA says protective grounding equipment must be capable of conducting the maximum fault current that could flow at the point of grounding for the time necessary to clear the fault, and it must have low enough impedance that it does not delay the operation of protective devices in case of accidental energization. That means the wrong kit is not just an inconvenience. It is a risk to both safety and compliance.
The 12 questions to ask before ordering
What system and work point is the kit for?
Start with the actual application point. Is the kit for an overhead line, substation, switchgear position, cable termination, or another defined grounding point? OSHA’s grounding guidance emphasizes that the protective grounding system must be engineered according to work site conditions, the nature of the work, and the construction involved. A kit selected without a clear work point is only half specified.
What is the maximum available fault current at the point of grounding?
This is one of the most important buying questions. OSHA explicitly says portable grounding cables and clamps must carry and withstand the maximum available fault current, not an estimated or convenient current level. If that number is unknown, the procurement basis is weak from the start.
What clearing time must the kit survive?
Fault current alone is not enough. OSHA ties portable grounding capability to the time required for the overcurrent device to trip or clear the fault. In procurement language, that means the kit should be selected against fault current plus clearing time, not current only.
What rated current and rated time classification are you asking for?
IEC 61230 is the framework, but the practical buying question is whether the ordered assembly is declared at a rating appropriate for the actual duty. Field guidance for portable earths expects the equipment to be marked with its rating as per IEC 61230:2008, or equivalent, and rail maintenance procedures require replacement with a set having an equivalent or greater rated current/rated time classification after a fault event.
What conductor cross-sectional area is required?
The conductor cross-sectional area is not a minor catalog detail. Portable earth guidance expects the delivered equipment to be marked with the conductor cross-sectional area, and measured resistance across the assembly depends on length, cross-sectional area, material, and number of earth conductors. If the RFQ does not define the conductor size, the kit is still under-specified.
What lead length and configuration are needed?
A grounding set is not only about current rating. It is also about whether the physical layout suits the work. Different jobs may require different lead lengths, different phase arrangements, or a customized connection layout. OSHA’s guidance to engineer protective grounding around site conditions supports making this a procurement question, not a site improvisation question.
Which clamp types and contact interfaces are required?
The kit is only usable if the clamps match the actual conductors or connection points. Buyers should define whether the job needs clamps for conductors, busbars, earth points, or other specific interfaces. A technically rated kit that cannot make the right mechanical connection at the work point is still the wrong purchase. This is a practical inference from OSHA’s requirement that the protective grounding system be suited to the work site and from the way portable earths are identified and controlled by configuration in field guidance.
Do you need more than one lead in parallel?
OSHA directly states that, depending on the available fault current, two or more leads in parallel may need to be installed. This makes parallel-lead capability a legitimate procurement question, not a late-stage field workaround. If the duty is high enough, a one-lead assumption may be wrong before the kit even ships.
What marking will appear on the equipment?
Do not wait until site acceptance to discover that the marking is vague or incomplete. Portable earth guidance says supplied equipment should be marked with the model or type reference, the rating as per IEC 61230:2008 or equivalent, the conductor cross-sectional area, and either the next test due date or a unique number for inclusion in a register. Those are not optional niceties. They are the fields that make the equipment controllable after delivery.
What traceability and inspection labels will be included?
Portable earths should not disappear into service as anonymous hardware. Guidance for inspection and care expects labeling that identifies, at minimum, the inspecting company or person and the next inspection date. That makes traceability and inspection labeling a procurement issue as much as a maintenance issue.
What records should be created or supplied when the kit arrives?
A strong purchasing process already anticipates site acceptance. Portable earth guidance says new portable earths should have their DC resistance measured and recorded, and the product should carry either the next test due date or a unique register number. That means your receiving process should be planned before ordering, not invented afterward.
What happens after a fault event or abnormal current duty?
This is one of the most overlooked questions. Rail safety maintenance documents state that all current-carrying components of portable earthing equipment are to be destroyed immediately after it has sustained fault conditions, and that faulted sets must be withdrawn from service and replaced with a set of equivalent rating. If your supplier or project team has no clear answer to this question, the lifecycle control model is incomplete.
Procurement checklist at a glance
| Question | Why it matters | What a strong answer looks like |
|---|---|---|
| What system and work point is the kit for? | Defines the real application | Specific line, bay, switchgear, or grounding point identified |
| What is the maximum available fault current? | Governs kit capability | Fault level provided by engineering data |
| What clearing time must it survive? | Rating depends on duty duration | Clearing time tied to protection settings |
| What rated current/rated time classification is needed? | Connects duty to the ordered set | Clear IEC 61230-related rating statement |
| What conductor cross-sectional area is required? | Affects performance and identification | Defined conductor size in the RFQ |
| What lead length and configuration are needed? | Physical usability depends on it | Clear phase/earth layout and lengths |
| Which clamp types are required? | The wrong interface makes the kit unusable | Clamp style tied to actual conductor/earth points |
| Do you need parallel leads? | High fault duty may require it | Engineering confirmation included |
| What marking will appear on the equipment? | Drives traceability and acceptance | Model, rating, CSA, and test-date/register marking defined |
| What traceability and inspection labels are included? | Supports controlled use | Unique ID and inspection labeling confirmed |
| What records are needed at arrival? | Avoids weak site acceptance | DC resistance baseline and register process defined |
| What is the post-fault replacement rule? | Controls lifecycle risk | Clear withdrawal-and-replace rule documented |
This table distills the main procurement logic from OSHA’s grounding equipment requirements and the field guidance on portable earth marking, traceability, and care.
Site acceptance starts before the goods arrive
A portable earthing kit is easier to accept when the RFQ already defines what must be checked on arrival. At a minimum, the receiving team should be able to verify the model or type reference, rating, conductor cross-sectional area, traceability marking, inspection status, and baseline record requirements. Guidance for new portable earths specifically recommends recording DC resistance on arrival.
Site acceptance checklist
| Item to verify on arrival | Why it matters | Accept / hold trigger |
|---|---|---|
| Model or type reference | Links kit to the ordered configuration | Hold if product identity is unclear |
| Rated current / rated time declaration | Confirms duty capability | Hold if rating is missing or vague |
| Conductor cross-sectional area | Confirms ordered conductor size | Hold if size is missing or inconsistent |
| Next test due date or unique register number | Enables traceability | Hold if the set cannot enter the control system |
| Inspection label / label status | Confirms inspection control | Hold if inspection status is unclear |
| Initial DC resistance record | Supports baseline integrity tracking | Hold if receiving procedure requires it and it is missing |
| Instructions for care / inspection handling | Supports lifecycle control | Clarify if not included where required by the project |
A strong acceptance process is not extra paperwork. It is what turns a delivered kit into controlled protective equipment rather than loose hardware.
Why IEC 61230 by itself is not enough wording
Saying “IEC 61230 kit” is a start, but it is not a full specification. IEC 61230 defines the scope of portable equipment for temporary earthing or earthing and short-circuiting on de-energized or electrically isolated systems. It does not remove the need to specify fault duty, configuration, conductor size, clamp interfaces, and traceability expectations. In other words, IEC 61230 gives you the standards frame, but the RFQ still has to define the actual kit.
The buyer’s rule of thumb
Do not order portable earthing and short-circuit kits by name alone. Order them by duty, configuration, marking, and control logic. OSHA’s rules make the fault-duty side clear. Field guidance makes the marking, register, and post-fault replacement side clear. The best purchasing outcome comes when both are defined before the quotation is issued.
FAQ
What is the first question to ask before ordering a portable earthing kit?
Start with the system and exact work point. If the application point is unclear, the kit is not yet properly specified.
Why is maximum available fault current so important?
Because OSHA requires portable grounding equipment to carry and withstand the maximum fault current available for the time needed for the protective device to clear the fault.
Is IEC 61230 compliance enough by itself?
No. IEC 61230 defines the equipment category and scope, but buyers still need to specify the actual duty, configuration, conductor size, interfaces, and control details.
What marking should portable earths have?
Field guidance expects supplied portable earths to be marked with the model or type reference, rating, conductor cross-sectional area, and either the next test due date or a unique number for the register.
What happens if a kit has sustained fault conditions?
Guidance for inspection and care states that current-carrying components must be destroyed immediately after fault conditions and the set must be withdrawn from service and replaced with an equivalent-rated set.
