Yes, there definitely could be a wrench needed for a 6" explosion-proof (XP) box. Here's why and what kind to look for

Why a wrench is needed:
Tightening Connections

Explosion-proof boxes rely on very tight, specific connections to maintain their integrity. The threaded entries and couplings must be properly tightened to prevent flames or sparks from escaping the enclosure. Loose connections could lead to an explosion propagating outside the enclosure.

Specific Torque Requirements

Many XP fittings have specific torque requirements. Using the wrong wrench or tightening by feel alone can result in under- or over-tightening, both of which are dangerous.

Large Conduit/Fittings

A 6" box usually corresponds to a large conduit size. Wrenches are necessary to tighten these large conduits and fittings properly.

What kind of wrench to use



Explosion-Proof Rating

Crucially, the wrench itself does NOT need to be explosion-proof. The explosion-proof rating applies to electrical enclosures and devices that might produce arcs or sparks. A standard, good-quality wrench will be sufficient.

Size

Obviously, the wrench needs to be large enough to fit the 6" fitting.

Type



Pipe Wrench

A pipe wrench is often used on threaded conduit and fittings.

Adjustable Wrench (Crescent Wrench)

A large adjustable wrench might work in some situations, but it's generally not ideal for explosion-proof connections because it's harder to get a precise, repeatable torque.

Torque Wrench

Ideally, a torque wrench is used to ensure the correct tightness according to the manufacturer's specifications. This will require the correct socket for the fitting.

Chain Wrench

For larger sizes, a chain wrench might be necessary, especially if access is limited.

Spud Wrench

Although not always ideal, a spud wrench is another option for tightening larger fittings and conduit.

Important Considerations



Manufacturer's Instructions

Always refer to the manufacturer's instructions for the specific explosion-proof box, fittings, and conduit being used. They will specify the correct torque values and recommended tools.

Qualified Personnel

Work on explosion-proof systems should only be performed by qualified electricians who are trained in explosion-proof installation practices.

Material Compatibility

Ensure the wrench is compatible with the fitting material to avoid damage.*

Thread Compound

Verify if a specific thread compound or sealant is required and apply it correctly.

In summary: Your electrician likely needs a large wrench (probably a pipe wrench or chain wrench) to properly tighten the fittings on the 6" explosion-proof box. The most important thing is to follow the manufacturer's instructions and use the correct torque to ensure a safe and reliable installation. Make sure your electrician has access to those instructions and is properly trained. Flag for review